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authorLinus Torvalds <torvalds@linux-foundation.org>2018-04-11 16:36:47 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-11 16:36:47 -0700
commit375479c38689fbc403cf57b2999278615a4163f5 (patch)
treeda9565f449ab769802bce0f69cb41e74c4dfb605 /arch/um
parent45df60cd2cbe2a8c32fd34e474b62b2b41bacf69 (diff)
parente40238dedb484c8a19f8257e4ef5d77d038f9ad8 (diff)
download96b-common-375479c38689fbc403cf57b2999278615a4163f5.tar.gz
Merge git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml
Pull UML updates from Richard Weinberger: - a new and faster epoll based IRQ controller and NIC driver - misc fixes and janitorial updates * git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml: Fix vector raw inintialization logic Migrate vector timers to new timer API um: Compile with modern headers um: vector: Fix an error handling path in 'vector_parse()' um: vector: Fix a memory allocation check um: vector: fix missing unlock on error in vector_net_open() um: Add missing EXPORT for free_irq_by_fd() High Performance UML Vector Network Driver Epoll based IRQ controller um: Use POSIX ucontext_t instead of struct ucontext um: time: Use timespec64 for persistent clock um: Restore symbol versions for __memcpy and memcpy
Diffstat (limited to 'arch/um')
-rw-r--r--arch/um/Kconfig.net11
-rw-r--r--arch/um/drivers/Makefile4
-rw-r--r--arch/um/drivers/chan_kern.c53
-rw-r--r--arch/um/drivers/line.c2
-rw-r--r--arch/um/drivers/net_kern.c4
-rw-r--r--arch/um/drivers/random.c11
-rw-r--r--arch/um/drivers/ubd_kern.c4
-rw-r--r--arch/um/drivers/vector_kern.c1633
-rw-r--r--arch/um/drivers/vector_kern.h130
-rw-r--r--arch/um/drivers/vector_transports.c458
-rw-r--r--arch/um/drivers/vector_user.c590
-rw-r--r--arch/um/drivers/vector_user.h100
-rw-r--r--arch/um/include/asm/asm-prototypes.h1
-rw-r--r--arch/um/include/asm/irq.h12
-rw-r--r--arch/um/include/shared/irq_user.h12
-rw-r--r--arch/um/include/shared/net_kern.h2
-rw-r--r--arch/um/include/shared/os.h17
-rw-r--r--arch/um/kernel/irq.c461
-rw-r--r--arch/um/kernel/time.c6
-rw-r--r--arch/um/os-Linux/file.c1
-rw-r--r--arch/um/os-Linux/irq.c202
-rw-r--r--arch/um/os-Linux/signal.c3
22 files changed, 3393 insertions, 324 deletions
diff --git a/arch/um/Kconfig.net b/arch/um/Kconfig.net
index e871af24d9cd..c390f3deb0dc 100644
--- a/arch/um/Kconfig.net
+++ b/arch/um/Kconfig.net
@@ -109,6 +109,17 @@ config UML_NET_DAEMON
more than one without conflict. If you don't need UML networking,
say N.
+config UML_NET_VECTOR
+ bool "Vector I/O high performance network devices"
+ depends on UML_NET
+ help
+ This User-Mode Linux network driver uses multi-message send
+ and receive functions. The host running the UML guest must have
+ a linux kernel version above 3.0 and a libc version > 2.13.
+ This driver provides tap, raw, gre and l2tpv3 network transports
+ with up to 4 times higher network throughput than the UML network
+ drivers.
+
config UML_NET_VDE
bool "VDE transport"
depends on UML_NET
diff --git a/arch/um/drivers/Makefile b/arch/um/drivers/Makefile
index e7582e1d248c..16b3cebddafb 100644
--- a/arch/um/drivers/Makefile
+++ b/arch/um/drivers/Makefile
@@ -9,6 +9,7 @@
slip-objs := slip_kern.o slip_user.o
slirp-objs := slirp_kern.o slirp_user.o
daemon-objs := daemon_kern.o daemon_user.o
+vector-objs := vector_kern.o vector_user.o vector_transports.o
umcast-objs := umcast_kern.o umcast_user.o
net-objs := net_kern.o net_user.o
mconsole-objs := mconsole_kern.o mconsole_user.o
@@ -43,6 +44,7 @@ obj-$(CONFIG_STDERR_CONSOLE) += stderr_console.o
obj-$(CONFIG_UML_NET_SLIP) += slip.o slip_common.o
obj-$(CONFIG_UML_NET_SLIRP) += slirp.o slip_common.o
obj-$(CONFIG_UML_NET_DAEMON) += daemon.o
+obj-$(CONFIG_UML_NET_VECTOR) += vector.o
obj-$(CONFIG_UML_NET_VDE) += vde.o
obj-$(CONFIG_UML_NET_MCAST) += umcast.o
obj-$(CONFIG_UML_NET_PCAP) += pcap.o
@@ -61,7 +63,7 @@ obj-$(CONFIG_BLK_DEV_COW_COMMON) += cow_user.o
obj-$(CONFIG_UML_RANDOM) += random.o
# pcap_user.o must be added explicitly.
-USER_OBJS := fd.o null.o pty.o tty.o xterm.o slip_common.o pcap_user.o vde_user.o
+USER_OBJS := fd.o null.o pty.o tty.o xterm.o slip_common.o pcap_user.o vde_user.o vector_user.o
CFLAGS_null.o = -DDEV_NULL=$(DEV_NULL_PATH)
include arch/um/scripts/Makefile.rules
diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index acbe6c67afba..05588f9466c7 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -171,56 +171,19 @@ int enable_chan(struct line *line)
return err;
}
-/* Items are added in IRQ context, when free_irq can't be called, and
- * removed in process context, when it can.
- * This handles interrupt sources which disappear, and which need to
- * be permanently disabled. This is discovered in IRQ context, but
- * the freeing of the IRQ must be done later.
- */
-static DEFINE_SPINLOCK(irqs_to_free_lock);
-static LIST_HEAD(irqs_to_free);
-
-void free_irqs(void)
-{
- struct chan *chan;
- LIST_HEAD(list);
- struct list_head *ele;
- unsigned long flags;
-
- spin_lock_irqsave(&irqs_to_free_lock, flags);
- list_splice_init(&irqs_to_free, &list);
- spin_unlock_irqrestore(&irqs_to_free_lock, flags);
-
- list_for_each(ele, &list) {
- chan = list_entry(ele, struct chan, free_list);
-
- if (chan->input && chan->enabled)
- um_free_irq(chan->line->driver->read_irq, chan);
- if (chan->output && chan->enabled)
- um_free_irq(chan->line->driver->write_irq, chan);
- chan->enabled = 0;
- }
-}
-
static void close_one_chan(struct chan *chan, int delay_free_irq)
{
- unsigned long flags;
-
if (!chan->opened)
return;
- if (delay_free_irq) {
- spin_lock_irqsave(&irqs_to_free_lock, flags);
- list_add(&chan->free_list, &irqs_to_free);
- spin_unlock_irqrestore(&irqs_to_free_lock, flags);
- }
- else {
- if (chan->input && chan->enabled)
- um_free_irq(chan->line->driver->read_irq, chan);
- if (chan->output && chan->enabled)
- um_free_irq(chan->line->driver->write_irq, chan);
- chan->enabled = 0;
- }
+ /* we can safely call free now - it will be marked
+ * as free and freed once the IRQ stopped processing
+ */
+ if (chan->input && chan->enabled)
+ um_free_irq(chan->line->driver->read_irq, chan);
+ if (chan->output && chan->enabled)
+ um_free_irq(chan->line->driver->write_irq, chan);
+ chan->enabled = 0;
if (chan->ops->close != NULL)
(*chan->ops->close)(chan->fd, chan->data);
diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
index 366e57f5e8d6..8d80b27502e6 100644
--- a/arch/um/drivers/line.c
+++ b/arch/um/drivers/line.c
@@ -284,7 +284,7 @@ int line_setup_irq(int fd, int input, int output, struct line *line, void *data)
if (err)
return err;
if (output)
- err = um_request_irq(driver->write_irq, fd, IRQ_WRITE,
+ err = um_request_irq(driver->write_irq, fd, IRQ_NONE,
line_write_interrupt, IRQF_SHARED,
driver->write_irq_name, data);
return err;
diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c
index b305f8247909..3ef1b48e064a 100644
--- a/arch/um/drivers/net_kern.c
+++ b/arch/um/drivers/net_kern.c
@@ -288,7 +288,7 @@ static void uml_net_user_timer_expire(struct timer_list *t)
#endif
}
-static void setup_etheraddr(struct net_device *dev, char *str)
+void uml_net_setup_etheraddr(struct net_device *dev, char *str)
{
unsigned char *addr = dev->dev_addr;
char *end;
@@ -412,7 +412,7 @@ static void eth_configure(int n, void *init, char *mac,
*/
snprintf(dev->name, sizeof(dev->name), "eth%d", n);
- setup_etheraddr(dev, mac);
+ uml_net_setup_etheraddr(dev, mac);
printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr);
diff --git a/arch/um/drivers/random.c b/arch/um/drivers/random.c
index 37c51a6be690..778a0e52d5a5 100644
--- a/arch/um/drivers/random.c
+++ b/arch/um/drivers/random.c
@@ -13,6 +13,7 @@
#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <linux/uaccess.h>
+#include <init.h>
#include <irq_kern.h>
#include <os.h>
@@ -154,7 +155,14 @@ err_out_cleanup_hw:
/*
* rng_cleanup - shutdown RNG module
*/
-static void __exit rng_cleanup (void)
+
+static void cleanup(void)
+{
+ free_irq_by_fd(random_fd);
+ os_close_file(random_fd);
+}
+
+static void __exit rng_cleanup(void)
{
os_close_file(random_fd);
misc_deregister (&rng_miscdev);
@@ -162,6 +170,7 @@ static void __exit rng_cleanup (void)
module_init (rng_init);
module_exit (rng_cleanup);
+__uml_exitcall(cleanup);
MODULE_DESCRIPTION("UML Host Random Number Generator (RNG) driver");
MODULE_LICENSE("GPL");
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index b55fe9bf5d3e..d4e8c497ae86 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -1587,11 +1587,11 @@ int io_thread(void *arg)
do {
res = os_write_file(kernel_fd, ((char *) io_req_buffer) + written, n);
- if (res > 0) {
+ if (res >= 0) {
written += res;
} else {
if (res != -EAGAIN) {
- printk("io_thread - read failed, fd = %d, "
+ printk("io_thread - write failed, fd = %d, "
"err = %d\n", kernel_fd, -n);
}
}
diff --git a/arch/um/drivers/vector_kern.c b/arch/um/drivers/vector_kern.c
new file mode 100644
index 000000000000..02168fe25105
--- /dev/null
+++ b/arch/um/drivers/vector_kern.c
@@ -0,0 +1,1633 @@
+/*
+ * Copyright (C) 2017 - Cambridge Greys Limited
+ * Copyright (C) 2011 - 2014 Cisco Systems Inc
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ * Licensed under the GPL.
+ */
+
+#include <linux/version.h>
+#include <linux/bootmem.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/inetdevice.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include <linux/platform_device.h>
+#include <linux/rtnetlink.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <init.h>
+#include <irq_kern.h>
+#include <irq_user.h>
+#include <net_kern.h>
+#include <os.h>
+#include "mconsole_kern.h"
+#include "vector_user.h"
+#include "vector_kern.h"
+
+/*
+ * Adapted from network devices with the following major changes:
+ * All transports are static - simplifies the code significantly
+ * Multiple FDs/IRQs per device
+ * Vector IO optionally used for read/write, falling back to legacy
+ * based on configuration and/or availability
+ * Configuration is no longer positional - L2TPv3 and GRE require up to
+ * 10 parameters, passing this as positional is not fit for purpose.
+ * Only socket transports are supported
+ */
+
+
+#define DRIVER_NAME "uml-vector"
+#define DRIVER_VERSION "01"
+struct vector_cmd_line_arg {
+ struct list_head list;
+ int unit;
+ char *arguments;
+};
+
+struct vector_device {
+ struct list_head list;
+ struct net_device *dev;
+ struct platform_device pdev;
+ int unit;
+ int opened;
+};
+
+static LIST_HEAD(vec_cmd_line);
+
+static DEFINE_SPINLOCK(vector_devices_lock);
+static LIST_HEAD(vector_devices);
+
+static int driver_registered;
+
+static void vector_eth_configure(int n, struct arglist *def);
+
+/* Argument accessors to set variables (and/or set default values)
+ * mtu, buffer sizing, default headroom, etc
+ */
+
+#define DEFAULT_HEADROOM 2
+#define SAFETY_MARGIN 32
+#define DEFAULT_VECTOR_SIZE 64
+#define TX_SMALL_PACKET 128
+#define MAX_IOV_SIZE (MAX_SKB_FRAGS + 1)
+
+static const struct {
+ const char string[ETH_GSTRING_LEN];
+} ethtool_stats_keys[] = {
+ { "rx_queue_max" },
+ { "rx_queue_running_average" },
+ { "tx_queue_max" },
+ { "tx_queue_running_average" },
+ { "rx_encaps_errors" },
+ { "tx_timeout_count" },
+ { "tx_restart_queue" },
+ { "tx_kicks" },
+ { "tx_flow_control_xon" },
+ { "tx_flow_control_xoff" },
+ { "rx_csum_offload_good" },
+ { "rx_csum_offload_errors"},
+ { "sg_ok"},
+ { "sg_linearized"},
+};
+
+#define VECTOR_NUM_STATS ARRAY_SIZE(ethtool_stats_keys)
+
+static void vector_reset_stats(struct vector_private *vp)
+{
+ vp->estats.rx_queue_max = 0;
+ vp->estats.rx_queue_running_average = 0;
+ vp->estats.tx_queue_max = 0;
+ vp->estats.tx_queue_running_average = 0;
+ vp->estats.rx_encaps_errors = 0;
+ vp->estats.tx_timeout_count = 0;
+ vp->estats.tx_restart_queue = 0;
+ vp->estats.tx_kicks = 0;
+ vp->estats.tx_flow_control_xon = 0;
+ vp->estats.tx_flow_control_xoff = 0;
+ vp->estats.sg_ok = 0;
+ vp->estats.sg_linearized = 0;
+}
+
+static int get_mtu(struct arglist *def)
+{
+ char *mtu = uml_vector_fetch_arg(def, "mtu");
+ long result;
+
+ if (mtu != NULL) {
+ if (kstrtoul(mtu, 10, &result) == 0)
+ return result;
+ }
+ return ETH_MAX_PACKET;
+}
+
+static int get_depth(struct arglist *def)
+{
+ char *mtu = uml_vector_fetch_arg(def, "depth");
+ long result;
+
+ if (mtu != NULL) {
+ if (kstrtoul(mtu, 10, &result) == 0)
+ return result;
+ }
+ return DEFAULT_VECTOR_SIZE;
+}
+
+static int get_headroom(struct arglist *def)
+{
+ char *mtu = uml_vector_fetch_arg(def, "headroom");
+ long result;
+
+ if (mtu != NULL) {
+ if (kstrtoul(mtu, 10, &result) == 0)
+ return result;
+ }
+ return DEFAULT_HEADROOM;
+}
+
+static int get_req_size(struct arglist *def)
+{
+ char *gro = uml_vector_fetch_arg(def, "gro");
+ long result;
+
+ if (gro != NULL) {
+ if (kstrtoul(gro, 10, &result) == 0) {
+ if (result > 0)
+ return 65536;
+ }
+ }
+ return get_mtu(def) + ETH_HEADER_OTHER +
+ get_headroom(def) + SAFETY_MARGIN;
+}
+
+
+static int get_transport_options(struct arglist *def)
+{
+ char *transport = uml_vector_fetch_arg(def, "transport");
+ char *vector = uml_vector_fetch_arg(def, "vec");
+
+ int vec_rx = VECTOR_RX;
+ int vec_tx = VECTOR_TX;
+ long parsed;
+
+ if (vector != NULL) {
+ if (kstrtoul(vector, 10, &parsed) == 0) {
+ if (parsed == 0) {
+ vec_rx = 0;
+ vec_tx = 0;
+ }
+ }
+ }
+
+
+ if (strncmp(transport, TRANS_TAP, TRANS_TAP_LEN) == 0)
+ return (vec_rx | VECTOR_BPF);
+ if (strncmp(transport, TRANS_RAW, TRANS_RAW_LEN) == 0)
+ return (vec_rx | vec_tx);
+ return (vec_rx | vec_tx);
+}
+
+
+/* A mini-buffer for packet drop read
+ * All of our supported transports are datagram oriented and we always
+ * read using recvmsg or recvmmsg. If we pass a buffer which is smaller
+ * than the packet size it still counts as full packet read and will
+ * clean the incoming stream to keep sigio/epoll happy
+ */
+
+#define DROP_BUFFER_SIZE 32
+
+static char *drop_buffer;
+
+/* Array backed queues optimized for bulk enqueue/dequeue and
+ * 1:N (small values of N) or 1:1 enqueuer/dequeuer ratios.
+ * For more details and full design rationale see
+ * http://foswiki.cambridgegreys.com/Main/EatYourTailAndEnjoyIt
+ */
+
+
+/*
+ * Advance the mmsg queue head by n = advance. Resets the queue to
+ * maximum enqueue/dequeue-at-once capacity if possible. Called by
+ * dequeuers. Caller must hold the head_lock!
+ */
+
+static int vector_advancehead(struct vector_queue *qi, int advance)
+{
+ int queue_depth;
+
+ qi->head =
+ (qi->head + advance)
+ % qi->max_depth;
+
+
+ spin_lock(&qi->tail_lock);
+ qi->queue_depth -= advance;
+
+ /* we are at 0, use this to
+ * reset head and tail so we can use max size vectors
+ */
+
+ if (qi->queue_depth == 0) {
+ qi->head = 0;
+ qi->tail = 0;
+ }
+ queue_depth = qi->queue_depth;
+ spin_unlock(&qi->tail_lock);
+ return queue_depth;
+}
+
+/* Advance the queue tail by n = advance.
+ * This is called by enqueuers which should hold the
+ * head lock already
+ */
+
+static int vector_advancetail(struct vector_queue *qi, int advance)
+{
+ int queue_depth;
+
+ qi->tail =
+ (qi->tail + advance)
+ % qi->max_depth;
+ spin_lock(&qi->head_lock);
+ qi->queue_depth += advance;
+ queue_depth = qi->queue_depth;
+ spin_unlock(&qi->head_lock);
+ return queue_depth;
+}
+
+static int prep_msg(struct vector_private *vp,
+ struct sk_buff *skb,
+ struct iovec *iov)
+{
+ int iov_index = 0;
+ int nr_frags, frag;
+ skb_frag_t *skb_frag;
+
+ nr_frags = skb_shinfo(skb)->nr_frags;
+ if (nr_frags > MAX_IOV_SIZE) {
+ if (skb_linearize(skb) != 0)
+ goto drop;
+ }
+ if (vp->header_size > 0) {
+ iov[iov_index].iov_len = vp->header_size;
+ vp->form_header(iov[iov_index].iov_base, skb, vp);
+ iov_index++;
+ }
+ iov[iov_index].iov_base = skb->data;
+ if (nr_frags > 0) {
+ iov[iov_index].iov_len = skb->len - skb->data_len;
+ vp->estats.sg_ok++;
+ } else
+ iov[iov_index].iov_len = skb->len;
+ iov_index++;
+ for (frag = 0; frag < nr_frags; frag++) {
+ skb_frag = &skb_shinfo(skb)->frags[frag];
+ iov[iov_index].iov_base = skb_frag_address_safe(skb_frag);
+ iov[iov_index].iov_len = skb_frag_size(skb_frag);
+ iov_index++;
+ }
+ return iov_index;
+drop:
+ return -1;
+}
+/*
+ * Generic vector enqueue with support for forming headers using transport
+ * specific callback. Allows GRE, L2TPv3, RAW and other transports
+ * to use a common enqueue procedure in vector mode
+ */
+
+static int vector_enqueue(struct vector_queue *qi, struct sk_buff *skb)
+{
+ struct vector_private *vp = netdev_priv(qi->dev);
+ int queue_depth;
+ int packet_len;
+ struct mmsghdr *mmsg_vector = qi->mmsg_vector;
+ int iov_count;
+
+ spin_lock(&qi->tail_lock);
+ spin_lock(&qi->head_lock);
+ queue_depth = qi->queue_depth;
+ spin_unlock(&qi->head_lock);
+
+ if (skb)
+ packet_len = skb->len;
+
+ if (queue_depth < qi->max_depth) {
+
+ *(qi->skbuff_vector + qi->tail) = skb;
+ mmsg_vector += qi->tail;
+ iov_count = prep_msg(
+ vp,
+ skb,
+ mmsg_vector->msg_hdr.msg_iov
+ );
+ if (iov_count < 1)
+ goto drop;
+ mmsg_vector->msg_hdr.msg_iovlen = iov_count;
+ mmsg_vector->msg_hdr.msg_name = vp->fds->remote_addr;
+ mmsg_vector->msg_hdr.msg_namelen = vp->fds->remote_addr_size;
+ queue_depth = vector_advancetail(qi, 1);
+ } else
+ goto drop;
+ spin_unlock(&qi->tail_lock);
+ return queue_depth;
+drop:
+ qi->dev->stats.tx_dropped++;
+ if (skb != NULL) {
+ packet_len = skb->len;
+ dev_consume_skb_any(skb);
+ netdev_completed_queue(qi->dev, 1, packet_len);
+ }
+ spin_unlock(&qi->tail_lock);
+ return queue_depth;
+}
+
+static int consume_vector_skbs(struct vector_queue *qi, int count)
+{
+ struct sk_buff *skb;
+ int skb_index;
+ int bytes_compl = 0;
+
+ for (skb_index = qi->head; skb_index < qi->head + count; skb_index++) {
+ skb = *(qi->skbuff_vector + skb_index);
+ /* mark as empty to ensure correct destruction if
+ * needed
+ */
+ bytes_compl += skb->len;
+ *(qi->skbuff_vector + skb_index) = NULL;
+ dev_consume_skb_any(skb);
+ }
+ qi->dev->stats.tx_bytes += bytes_compl;
+ qi->dev->stats.tx_packets += count;
+ netdev_completed_queue(qi->dev, count, bytes_compl);
+ return vector_advancehead(qi, count);
+}
+
+/*
+ * Generic vector deque via sendmmsg with support for forming headers
+ * using transport specific callback. Allows GRE, L2TPv3, RAW and
+ * other transports to use a common dequeue procedure in vector mode
+ */
+
+
+static int vector_send(struct vector_queue *qi)
+{
+ struct vector_private *vp = netdev_priv(qi->dev);
+ struct mmsghdr *send_from;
+ int result = 0, send_len, queue_depth = qi->max_depth;
+
+ if (spin_trylock(&qi->head_lock)) {
+ if (spin_trylock(&qi->tail_lock)) {
+ /* update queue_depth to current value */
+ queue_depth = qi->queue_depth;
+ spin_unlock(&qi->tail_lock);
+ while (queue_depth > 0) {
+ /* Calculate the start of the vector */
+ send_len = queue_depth;
+ send_from = qi->mmsg_vector;
+ send_from += qi->head;
+ /* Adjust vector size if wraparound */
+ if (send_len + qi->head > qi->max_depth)
+ send_len = qi->max_depth - qi->head;
+ /* Try to TX as many packets as possible */
+ if (send_len > 0) {
+ result = uml_vector_sendmmsg(
+ vp->fds->tx_fd,
+ send_from,
+ send_len,
+ 0
+ );
+ vp->in_write_poll =
+ (result != send_len);
+ }
+ /* For some of the sendmmsg error scenarios
+ * we may end being unsure in the TX success
+ * for all packets. It is safer to declare
+ * them all TX-ed and blame the network.
+ */
+ if (result < 0) {
+ if (net_ratelimit())
+ netdev_err(vp->dev, "sendmmsg err=%i\n",
+ result);
+ result = send_len;
+ }
+ if (result > 0) {
+ queue_depth =
+ consume_vector_skbs(qi, result);
+ /* This is equivalent to an TX IRQ.
+ * Restart the upper layers to feed us
+ * more packets.
+ */
+ if (result > vp->estats.tx_queue_max)
+ vp->estats.tx_queue_max = result;
+ vp->estats.tx_queue_running_average =
+ (vp->estats.tx_queue_running_average + result) >> 1;
+ }
+ netif_trans_update(qi->dev);
+ netif_wake_queue(qi->dev);
+ /* if TX is busy, break out of the send loop,
+ * poll write IRQ will reschedule xmit for us
+ */
+ if (result != send_len) {
+ vp->estats.tx_restart_queue++;
+ break;
+ }
+ }
+ }
+ spin_unlock(&qi->head_lock);
+ } else {
+ tasklet_schedule(&vp->tx_poll);
+ }
+ return queue_depth;
+}
+
+/* Queue destructor. Deliberately stateless so we can use
+ * it in queue cleanup if initialization fails.
+ */
+
+static void destroy_queue(struct vector_queue *qi)
+{
+ int i;
+ struct iovec *iov;
+ struct vector_private *vp = netdev_priv(qi->dev);
+ struct mmsghdr *mmsg_vector;
+
+ if (qi == NULL)
+ return;
+ /* deallocate any skbuffs - we rely on any unused to be
+ * set to NULL.
+ */
+ if (qi->skbuff_vector != NULL) {
+ for (i = 0; i < qi->max_depth; i++) {
+ if (*(qi->skbuff_vector + i) != NULL)
+ dev_kfree_skb_any(*(qi->skbuff_vector + i));
+ }
+ kfree(qi->skbuff_vector);
+ }
+ /* deallocate matching IOV structures including header buffs */
+ if (qi->mmsg_vector != NULL) {
+ mmsg_vector = qi->mmsg_vector;
+ for (i = 0; i < qi->max_depth; i++) {
+ iov = mmsg_vector->msg_hdr.msg_iov;
+ if (iov != NULL) {
+ if ((vp->header_size > 0) &&
+ (iov->iov_base != NULL))
+ kfree(iov->iov_base);
+ kfree(iov);
+ }
+ mmsg_vector++;
+ }
+ kfree(qi->mmsg_vector);
+ }
+ kfree(qi);
+}
+
+/*
+ * Queue constructor. Create a queue with a given side.
+ */
+static struct vector_queue *create_queue(
+ struct vector_private *vp,
+ int max_size,
+ int header_size,
+ int num_extra_frags)
+{
+ struct vector_queue *result;
+ int i;
+ struct iovec *iov;
+ struct mmsghdr *mmsg_vector;
+
+ result = kmalloc(sizeof(struct vector_queue), GFP_KERNEL);
+ if (result == NULL)
+ goto out_fail;
+ result->max_depth = max_size;
+ result->dev = vp->dev;
+ result->mmsg_vector = kmalloc(
+ (sizeof(struct mmsghdr) * max_size), GFP_KERNEL);
+ result->skbuff_vector = kmalloc(
+ (sizeof(void *) * max_size), GFP_KERNEL);
+ if (result->mmsg_vector == NULL || result->skbuff_vector == NULL)
+ goto out_fail;
+
+ mmsg_vector = result->mmsg_vector;
+ for (i = 0; i < max_size; i++) {
+ /* Clear all pointers - we use non-NULL as marking on
+ * what to free on destruction
+ */
+ *(result->skbuff_vector + i) = NULL;
+ mmsg_vector->msg_hdr.msg_iov = NULL;
+ mmsg_vector++;
+ }
+ mmsg_vector = result->mmsg_vector;
+ result->max_iov_frags = num_extra_frags;
+ for (i = 0; i < max_size; i++) {
+ if (vp->header_size > 0)
+ iov = kmalloc(
+ sizeof(struct iovec) * (3 + num_extra_frags),
+ GFP_KERNEL
+ );
+ else
+ iov = kmalloc(
+ sizeof(struct iovec) * (2 + num_extra_frags),
+ GFP_KERNEL
+ );
+ if (iov == NULL)
+ goto out_fail;
+ mmsg_vector->msg_hdr.msg_iov = iov;
+ mmsg_vector->msg_hdr.msg_iovlen = 1;
+ mmsg_vector->msg_hdr.msg_control = NULL;
+ mmsg_vector->msg_hdr.msg_controllen = 0;
+ mmsg_vector->msg_hdr.msg_flags = MSG_DONTWAIT;
+ mmsg_vector->msg_hdr.msg_name = NULL;
+ mmsg_vector->msg_hdr.msg_namelen = 0;
+ if (vp->header_size > 0) {
+ iov->iov_base = kmalloc(header_size, GFP_KERNEL);
+ if (iov->iov_base == NULL)
+ goto out_fail;
+ iov->iov_len = header_size;
+ mmsg_vector->msg_hdr.msg_iovlen = 2;
+ iov++;
+ }
+ iov->iov_base = NULL;
+ iov->iov_len = 0;
+ mmsg_vector++;
+ }
+ spin_lock_init(&result->head_lock);
+ spin_lock_init(&result->tail_lock);
+ result->queue_depth = 0;
+ result->head = 0;
+ result->tail = 0;
+ return result;
+out_fail:
+ destroy_queue(result);
+ return NULL;
+}
+
+/*
+ * We do not use the RX queue as a proper wraparound queue for now
+ * This is not necessary because the consumption via netif_rx()
+ * happens in-line. While we can try using the return code of
+ * netif_rx() for flow control there are no drivers doing this today.
+ * For this RX specific use we ignore the tail/head locks and
+ * just read into a prepared queue filled with skbuffs.
+ */
+
+static struct sk_buff *prep_skb(
+ struct vector_private *vp,
+ struct user_msghdr *msg)
+{
+ int linear = vp->max_packet + vp->headroom + SAFETY_MARGIN;
+ struct sk_buff *result;
+ int iov_index = 0, len;
+ struct iovec *iov = msg->msg_iov;
+ int err, nr_frags, frag;
+ skb_frag_t *skb_frag;
+
+ if (vp->req_size <= linear)
+ len = linear;
+ else
+ len = vp->req_size;
+ result = alloc_skb_with_frags(
+ linear,
+ len - vp->max_packet,
+ 3,
+ &err,
+ GFP_ATOMIC
+ );
+ if (vp->header_size > 0)
+ iov_index++;
+ if (result == NULL) {
+ iov[iov_index].iov_base = NULL;
+ iov[iov_index].iov_len = 0;
+ goto done;
+ }
+ skb_reserve(result, vp->headroom);
+ result->dev = vp->dev;
+ skb_put(result, vp->max_packet);
+ result->data_len = len - vp->max_packet;
+ result->len += len - vp->max_packet;
+ skb_reset_mac_header(result);
+ result->ip_summed = CHECKSUM_NONE;
+ iov[iov_index].iov_base = result->data;
+ iov[iov_index].iov_len = vp->max_packet;
+ iov_index++;
+
+ nr_frags = skb_shinfo(result)->nr_frags;
+ for (frag = 0; frag < nr_frags; frag++) {
+ skb_frag = &skb_shinfo(result)->frags[frag];
+ iov[iov_index].iov_base = skb_frag_address_safe(skb_frag);
+ if (iov[iov_index].iov_base != NULL)
+ iov[iov_index].iov_len = skb_frag_size(skb_frag);
+ else
+ iov[iov_index].iov_len = 0;
+ iov_index++;
+ }
+done:
+ msg->msg_iovlen = iov_index;
+ return result;
+}
+
+
+/* Prepare queue for recvmmsg one-shot rx - fill with fresh sk_buffs*/
+
+static void prep_queue_for_rx(struct vector_queue *qi)
+{
+ struct vector_private *vp = netdev_priv(qi->dev);
+ struct mmsghdr *mmsg_vector = qi->mmsg_vector;
+ void **skbuff_vector = qi->skbuff_vector;
+ int i;
+
+ if (qi->queue_depth == 0)
+ return;
+ for (i = 0; i < qi->queue_depth; i++) {
+ /* it is OK if allocation fails - recvmmsg with NULL data in
+ * iov argument still performs an RX, just drops the packet
+ * This allows us stop faffing around with a "drop buffer"
+ */
+
+ *skbuff_vector = prep_skb(vp, &mmsg_vector->msg_hdr);
+ skbuff_vector++;
+ mmsg_vector++;
+ }
+ qi->queue_depth = 0;
+}
+
+static struct vector_device *find_device(int n)
+{
+ struct vector_device *device;
+ struct list_head *ele;
+
+ spin_lock(&vector_devices_lock);
+ list_for_each(ele, &vector_devices) {
+ device = list_entry(ele, struct vector_device, list);
+ if (device->unit == n)
+ goto out;
+ }
+ device = NULL;
+ out:
+ spin_unlock(&vector_devices_lock);
+ return device;
+}
+
+static int vector_parse(char *str, int *index_out, char **str_out,
+ char **error_out)
+{
+ int n, len, err;
+ char *start = str;
+
+ len = strlen(str);
+
+ while ((*str != ':') && (strlen(str) > 1))
+ str++;
+ if (*str != ':') {
+ *error_out = "Expected ':' after device number";
+ return -EINVAL;
+ }
+ *str = '\0';
+
+ err = kstrtouint(start, 0, &n);
+ if (err < 0) {
+ *error_out = "Bad device number";
+ return err;
+ }
+
+ str++;
+ if (find_device(n)) {
+ *error_out = "Device already configured";
+ return -EINVAL;
+ }
+
+ *index_out = n;
+ *str_out = str;
+ return 0;
+}
+
+static int vector_config(char *str, char **error_out)
+{
+ int err, n;
+ char *params;
+ struct arglist *parsed;
+
+ err = vector_parse(str, &n, &params, error_out);
+ if (err != 0)
+ return err;
+
+ /* This string is broken up and the pieces used by the underlying
+ * driver. We should copy it to make sure things do not go wrong
+ * later.
+ */
+
+ params = kstrdup(params, GFP_KERNEL);
+ if (params == NULL) {
+ *error_out = "vector_config failed to strdup string";
+ return -ENOMEM;
+ }
+
+ parsed = uml_parse_vector_ifspec(params);
+
+ if (parsed == NULL) {
+ *error_out = "vector_config failed to parse parameters";
+ return -EINVAL;
+ }
+
+ vector_eth_configure(n, parsed);
+ return 0;
+}
+
+static int vector_id(char **str, int *start_out, int *end_out)
+{
+ char *end;
+ int n;
+
+ n = simple_strtoul(*str, &end, 0);
+ if ((*end != '\0') || (end == *str))
+ return -1;
+
+ *start_out = n;
+ *end_out = n;
+ *str = end;
+ return n;
+}
+
+static int vector_remove(int n, char **error_out)
+{
+ struct vector_device *vec_d;
+ struct net_device *dev;
+ struct vector_private *vp;
+
+ vec_d = find_device(n);
+ if (vec_d == NULL)
+ return -ENODEV;
+ dev = vec_d->dev;
+ vp = netdev_priv(dev);
+ if (vp->fds != NULL)
+ return -EBUSY;
+ unregister_netdev(dev);
+ platform_device_unregister(&vec_d->pdev);
+ return 0;
+}
+
+/*
+ * There is no shared per-transport initialization code, so
+ * we will just initialize each interface one by one and
+ * add them to a list
+ */
+
+static struct platform_driver uml_net_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+};
+
+
+static void vector_device_release(struct device *dev)
+{
+ struct vector_device *device = dev_get_drvdata(dev);
+ struct net_device *netdev = device->dev;
+
+ list_del(&device->list);
+ kfree(device);
+ free_netdev(netdev);
+}
+
+/* Bog standard recv using recvmsg - not used normally unless the user
+ * explicitly specifies not to use recvmmsg vector RX.
+ */
+
+static int vector_legacy_rx(struct vector_private *vp)
+{
+ int pkt_len;
+ struct user_msghdr hdr;
+ struct iovec iov[2 + MAX_IOV_SIZE]; /* header + data use case only */
+ int iovpos = 0;
+ struct sk_buff *skb;
+ int header_check;
+
+ hdr.msg_name = NULL;
+ hdr.msg_namelen = 0;
+ hdr.msg_iov = (struct iovec *) &iov;
+ hdr.msg_control = NULL;
+ hdr.msg_controllen = 0;
+ hdr.msg_flags = 0;
+
+ if (vp->header_size > 0) {
+ iov[0].iov_base = vp->header_rxbuffer;
+ iov[0].iov_len = vp->header_size;
+ }
+
+ skb = prep_skb(vp, &hdr);
+
+ if (skb == NULL) {
+ /* Read a packet into drop_buffer and don't do
+ * anything with it.
+ */
+ iov[iovpos].iov_base = drop_buffer;
+ iov[iovpos].iov_len = DROP_BUFFER_SIZE;
+ hdr.msg_iovlen = 1;
+ vp->dev->stats.rx_dropped++;
+ }
+
+ pkt_len = uml_vector_recvmsg(vp->fds->rx_fd, &hdr, 0);
+
+ if (skb != NULL) {
+ if (pkt_len > vp->header_size) {
+ if (vp->header_size > 0) {
+ header_check = vp->verify_header(
+ vp->header_rxbuffer, skb, vp);
+ if (header_check < 0) {
+ dev_kfree_skb_irq(skb);
+ vp->dev->stats.rx_dropped++;
+ vp->estats.rx_encaps_errors++;
+ return 0;
+ }
+ if (header_check > 0) {
+ vp->estats.rx_csum_offload_good++;
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+ }
+ pskb_trim(skb, pkt_len - vp->rx_header_size);
+ skb->protocol = eth_type_trans(skb, skb->dev);
+ vp->dev->stats.rx_bytes += skb->len;
+ vp->dev->stats.rx_packets++;
+ netif_rx(skb);
+ } else {
+ dev_kfree_skb_irq(skb);
+ }
+ }
+ return pkt_len;
+}
+
+/*
+ * Packet at a time TX which falls back to vector TX if the
+ * underlying transport is busy.
+ */
+
+
+
+static int writev_tx(struct vector_private *vp, struct sk_buff *skb)
+{
+ struct iovec iov[3 + MAX_IOV_SIZE];
+ int iov_count, pkt_len = 0;
+
+ iov[0].iov_base = vp->header_txbuffer;
+ iov_count = prep_msg(vp, skb, (struct iovec *) &iov);
+
+ if (iov_count < 1)
+ goto drop;
+ pkt_len = uml_vector_writev(
+ vp->fds->tx_fd,
+ (struct iovec *) &iov,
+ iov_count
+ );
+
+ netif_trans_update(vp->dev);
+ netif_wake_queue(vp->dev);
+
+ if (pkt_len > 0) {
+ vp->dev->stats.tx_bytes += skb->len;
+ vp->dev->stats.tx_packets++;
+ } else {
+ vp->dev->stats.tx_dropped++;
+ }
+ consume_skb(skb);
+ return pkt_len;
+drop:
+ vp->dev->stats.tx_dropped++;
+ consume_skb(skb);
+ return pkt_len;
+}
+
+/*
+ * Receive as many messages as we can in one call using the special
+ * mmsg vector matched to an skb vector which we prepared earlier.
+ */
+
+static int vector_mmsg_rx(struct vector_private *vp)
+{
+ int packet_count, i;
+ struct vector_queue *qi = vp->rx_queue;
+ struct sk_buff *skb;
+ struct mmsghdr *mmsg_vector = qi->mmsg_vector;
+ void **skbuff_vector = qi->skbuff_vector;
+ int header_check;
+
+ /* Refresh the vector and make sure it is with new skbs and the
+ * iovs are updated to point to them.
+ */
+
+ prep_queue_for_rx(qi);
+
+ /* Fire the Lazy Gun - get as many packets as we can in one go. */
+
+ packet_count = uml_vector_recvmmsg(
+ vp->fds->rx_fd, qi->mmsg_vector, qi->max_depth, 0);
+
+ if (packet_count <= 0)
+ return packet_count;
+
+ /* We treat packet processing as enqueue, buffer refresh as dequeue
+ * The queue_depth tells us how many buffers have been used and how
+ * many do we need to prep the next time prep_queue_for_rx() is called.
+ */
+
+ qi->queue_depth = packet_count;
+
+ for (i = 0; i < packet_count; i++) {
+ skb = (*skbuff_vector);
+ if (mmsg_vector->msg_len > vp->header_size) {
+ if (vp->header_size > 0) {
+ header_check = vp->verify_header(
+ mmsg_vector->msg_hdr.msg_iov->iov_base,
+ skb,
+ vp
+ );
+ if (header_check < 0) {
+ /* Overlay header failed to verify - discard.
+ * We can actually keep this skb and reuse it,
+ * but that will make the prep logic too
+ * complex.
+ */
+ dev_kfree_skb_irq(skb);
+ vp->estats.rx_encaps_errors++;
+ continue;
+ }
+ if (header_check > 0) {
+ vp->estats.rx_csum_offload_good++;
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+ }
+ pskb_trim(skb,
+ mmsg_vector->msg_len - vp->rx_header_size);
+ skb->protocol = eth_type_trans(skb, skb->dev);
+ /*
+ * We do not need to lock on updating stats here
+ * The interrupt loop is non-reentrant.
+ */
+ vp->dev->stats.rx_bytes += skb->len;
+ vp->dev->stats.rx_packets++;
+ netif_rx(skb);
+ } else {
+ /* Overlay header too short to do anything - discard.
+ * We can actually keep this skb and reuse it,
+ * but that will make the prep logic too complex.
+ */
+ if (skb != NULL)
+ dev_kfree_skb_irq(skb);
+ }
+ (*skbuff_vector) = NULL;
+ /* Move to the next buffer element */
+ mmsg_vector++;
+ skbuff_vector++;
+ }
+ if (packet_count > 0) {
+ if (vp->estats.rx_queue_max < packet_count)
+ vp->estats.rx_queue_max = packet_count;
+ vp->estats.rx_queue_running_average =
+ (vp->estats.rx_queue_running_average + packet_count) >> 1;
+ }
+ return packet_count;
+}
+
+static void vector_rx(struct vector_private *vp)
+{
+ int err;
+
+ if ((vp->options & VECTOR_RX) > 0)
+ while ((err = vector_mmsg_rx(vp)) > 0)
+ ;
+ else
+ while ((err = vector_legacy_rx(vp)) > 0)
+ ;
+ if ((err != 0) && net_ratelimit())
+ netdev_err(vp->dev, "vector_rx: error(%d)\n", err);
+}
+
+static int vector_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct vector_private *vp = netdev_priv(dev);
+ int queue_depth = 0;
+
+ if ((vp->options & VECTOR_TX) == 0) {
+ writev_tx(vp, skb);
+ return NETDEV_TX_OK;
+ }
+
+ /* We do BQL only in the vector path, no point doing it in
+ * packet at a time mode as there is no device queue
+ */
+
+ netdev_sent_queue(vp->dev, skb->len);
+ queue_depth = vector_enqueue(vp->tx_queue, skb);
+
+ /* if the device queue is full, stop the upper layers and
+ * flush it.
+ */
+
+ if (queue_depth >= vp->tx_queue->max_depth - 1) {
+ vp->estats.tx_kicks++;
+ netif_stop_queue(dev);
+ vector_send(vp->tx_queue);
+ return NETDEV_TX_OK;
+ }
+ if (skb->xmit_more) {
+ mod_timer(&vp->tl, vp->coalesce);
+ return NETDEV_TX_OK;
+ }
+ if (skb->len < TX_SMALL_PACKET) {
+ vp->estats.tx_kicks++;
+ vector_send(vp->tx_queue);
+ } else
+ tasklet_schedule(&vp->tx_poll);
+ return NETDEV_TX_OK;
+}
+
+static irqreturn_t vector_rx_interrupt(int irq, void *dev_id)
+{
+ struct net_device *dev = dev_id;
+ struct vector_private *vp = netdev_priv(dev);
+
+ if (!netif_running(dev))
+ return IRQ_NONE;
+ vector_rx(vp);
+ return IRQ_HANDLED;
+
+}
+
+static irqreturn_t vector_tx_interrupt(int irq, void *dev_id)
+{
+ struct net_device *dev = dev_id;
+ struct vector_private *vp = netdev_priv(dev);
+
+ if (!netif_running(dev))
+ return IRQ_NONE;
+ /* We need to pay attention to it only if we got
+ * -EAGAIN or -ENOBUFFS from sendmmsg. Otherwise
+ * we ignore it. In the future, it may be worth
+ * it to improve the IRQ controller a bit to make
+ * tweaking the IRQ mask less costly
+ */
+
+ if (vp->in_write_poll)
+ tasklet_schedule(&vp->tx_poll);
+ return IRQ_HANDLED;
+
+}
+
+static int irq_rr;
+
+static int vector_net_close(struct net_device *dev)
+{
+ struct vector_private *vp = netdev_priv(dev);
+ unsigned long flags;
+
+ netif_stop_queue(dev);
+ del_timer(&vp->tl);
+
+ if (vp->fds == NULL)
+ return 0;
+
+ /* Disable and free all IRQS */
+ if (vp->rx_irq > 0) {
+ um_free_irq(vp->rx_irq, dev);
+ vp->rx_irq = 0;
+ }
+ if (vp->tx_irq > 0) {
+ um_free_irq(vp->tx_irq, dev);
+ vp->tx_irq = 0;
+ }
+ tasklet_kill(&vp->tx_poll);
+ if (vp->fds->rx_fd > 0) {
+ os_close_file(vp->fds->rx_fd);
+ vp->fds->rx_fd = -1;
+ }
+ if (vp->fds->tx_fd > 0) {
+ os_close_file(vp->fds->tx_fd);
+ vp->fds->tx_fd = -1;
+ }
+ if (vp->bpf != NULL)
+ kfree(vp->bpf);
+ if (vp->fds->remote_addr != NULL)
+ kfree(vp->fds->remote_addr);
+ if (vp->transport_data != NULL)
+ kfree(vp->transport_data);
+ if (vp->header_rxbuffer != NULL)
+ kfree(vp->header_rxbuffer);
+ if (vp->header_txbuffer != NULL)
+ kfree(vp->header_txbuffer);
+ if (vp->rx_queue != NULL)
+ destroy_queue(vp->rx_queue);
+ if (vp->tx_queue != NULL)
+ destroy_queue(vp->tx_queue);
+ kfree(vp->fds);
+ vp->fds = NULL;
+ spin_lock_irqsave(&vp->lock, flags);
+ vp->opened = false;
+ spin_unlock_irqrestore(&vp->lock, flags);
+ return 0;
+}
+
+/* TX tasklet */
+
+static void vector_tx_poll(unsigned long data)
+{
+ struct vector_private *vp = (struct vector_private *)data;
+
+ vp->estats.tx_kicks++;
+ vector_send(vp->tx_queue);
+}
+static void vector_reset_tx(struct work_struct *work)
+{
+ struct vector_private *vp =
+ container_of(work, struct vector_private, reset_tx);
+ netdev_reset_queue(vp->dev);
+ netif_start_queue(vp->dev);
+ netif_wake_queue(vp->dev);
+}
+static int vector_net_open(struct net_device *dev)
+{
+ struct vector_private *vp = netdev_priv(dev);
+ unsigned long flags;
+ int err = -EINVAL;
+ struct vector_device *vdevice;
+
+ spin_lock_irqsave(&vp->lock, flags);
+ if (vp->opened) {
+ spin_unlock_irqrestore(&vp->lock, flags);
+ return -ENXIO;
+ }
+ vp->opened = true;
+ spin_unlock_irqrestore(&vp->lock, flags);
+
+ vp->fds = uml_vector_user_open(vp->unit, vp->parsed);
+
+ if (vp->fds == NULL)
+ goto out_close;
+
+ if (build_transport_data(vp) < 0)
+ goto out_close;
+
+ if ((vp->options & VECTOR_RX) > 0) {
+ vp->rx_queue = create_queue(
+ vp,
+ get_depth(vp->parsed),
+ vp->rx_header_size,
+ MAX_IOV_SIZE
+ );
+ vp->rx_queue->queue_depth = get_depth(vp->parsed);
+ } else {
+ vp->header_rxbuffer = kmalloc(
+ vp->rx_header_size,
+ GFP_KERNEL
+ );
+ if (vp->header_rxbuffer == NULL)
+ goto out_close;
+ }
+ if ((vp->options & VECTOR_TX) > 0) {
+ vp->tx_queue = create_queue(
+ vp,
+ get_depth(vp->parsed),
+ vp->header_size,
+ MAX_IOV_SIZE
+ );
+ } else {
+ vp->header_txbuffer = kmalloc(vp->header_size, GFP_KERNEL);
+ if (vp->header_txbuffer == NULL)
+ goto out_close;
+ }
+
+ /* READ IRQ */
+ err = um_request_irq(
+ irq_rr + VECTOR_BASE_IRQ, vp->fds->rx_fd,
+ IRQ_READ, vector_rx_interrupt,
+ IRQF_SHARED, dev->name, dev);
+ if (err != 0) {
+ netdev_err(dev, "vector_open: failed to get rx irq(%d)\n", err);
+ err = -ENETUNREACH;
+ goto out_close;
+ }
+ vp->rx_irq = irq_rr + VECTOR_BASE_IRQ;
+ dev->irq = irq_rr + VECTOR_BASE_IRQ;
+ irq_rr = (irq_rr + 1) % VECTOR_IRQ_SPACE;
+
+ /* WRITE IRQ - we need it only if we have vector TX */
+ if ((vp->options & VECTOR_TX) > 0) {
+ err = um_request_irq(
+ irq_rr + VECTOR_BASE_IRQ, vp->fds->tx_fd,
+ IRQ_WRITE, vector_tx_interrupt,
+ IRQF_SHARED, dev->name, dev);
+ if (err != 0) {
+ netdev_err(dev,
+ "vector_open: failed to get tx irq(%d)\n", err);
+ err = -ENETUNREACH;
+ goto out_close;
+ }
+ vp->tx_irq = irq_rr + VECTOR_BASE_IRQ;
+ irq_rr = (irq_rr + 1) % VECTOR_IRQ_SPACE;
+ }
+
+ if ((vp->options & VECTOR_QDISC_BYPASS) != 0) {
+ if (!uml_raw_enable_qdisc_bypass(vp->fds->rx_fd))
+ vp->options = vp->options | VECTOR_BPF;
+ }
+
+ if ((vp->options & VECTOR_BPF) != 0)
+ vp->bpf = uml_vector_default_bpf(vp->fds->rx_fd, dev->dev_addr);
+
+ netif_start_queue(dev);
+
+ /* clear buffer - it can happen that the host side of the interface
+ * is full when we get here. In this case, new data is never queued,
+ * SIGIOs never arrive, and the net never works.
+ */
+
+ vector_rx(vp);
+
+ vector_reset_stats(vp);
+ vdevice = find_device(vp->unit);
+ vdevice->opened = 1;
+
+ if ((vp->options & VECTOR_TX) != 0)
+ add_timer(&vp->tl);
+ return 0;
+out_close:
+ vector_net_close(dev);
+ return err;
+}
+
+
+static void vector_net_set_multicast_list(struct net_device *dev)
+{
+ /* TODO: - we can do some BPF games here */
+ return;
+}
+
+static void vector_net_tx_timeout(struct net_device *dev)
+{
+ struct vector_private *vp = netdev_priv(dev);
+
+ vp->estats.tx_timeout_count++;
+ netif_trans_update(dev);
+ schedule_work(&vp->reset_tx);
+}
+
+static netdev_features_t vector_fix_features(struct net_device *dev,
+ netdev_features_t features)
+{
+ features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
+ return features;
+}
+
+static int vector_set_features(struct net_device *dev,
+ netdev_features_t features)
+{
+ struct vector_private *vp = netdev_priv(dev);
+ /* Adjust buffer sizes for GSO/GRO. Unfortunately, there is
+ * no way to negotiate it on raw sockets, so we can change
+ * only our side.
+ */
+ if (features & NETIF_F_GRO)
+ /* All new frame buffers will be GRO-sized */
+ vp->req_size = 65536;
+ else
+ /* All new frame buffers will be normal sized */
+ vp->req_size = vp->max_packet + vp->headroom + SAFETY_MARGIN;
+ return 0;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void vector_net_poll_controller(struct net_device *dev)
+{
+ disable_irq(dev->irq);
+ vector_rx_interrupt(dev->irq, dev);
+ enable_irq(dev->irq);
+}
+#endif
+
+static void vector_net_get_drvinfo(struct net_device *dev,
+ struct ethtool_drvinfo *info)
+{
+ strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
+ strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
+}
+
+static void vector_get_ringparam(struct net_device *netdev,
+ struct ethtool_ringparam *ring)
+{
+ struct vector_private *vp = netdev_priv(netdev);
+
+ ring->rx_max_pending = vp->rx_queue->max_depth;
+ ring->tx_max_pending = vp->tx_queue->max_depth;
+ ring->rx_pending = vp->rx_queue->max_depth;
+ ring->tx_pending = vp->tx_queue->max_depth;
+}
+
+static void vector_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
+{
+ switch (stringset) {
+ case ETH_SS_TEST:
+ *buf = '\0';
+ break;
+ case ETH_SS_STATS:
+ memcpy(buf, &ethtool_stats_keys, sizeof(ethtool_stats_keys));
+ break;
+ default:
+ WARN_ON(1);
+ break;
+ }
+}
+
+static int vector_get_sset_count(struct net_device *dev, int sset)
+{
+ switch (sset) {
+ case ETH_SS_TEST:
+ return 0;
+ case ETH_SS_STATS:
+ return VECTOR_NUM_STATS;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static void vector_get_ethtool_stats(struct net_device *dev,
+ struct ethtool_stats *estats,
+ u64 *tmp_stats)
+{
+ struct vector_private *vp = netdev_priv(dev);
+
+ memcpy(tmp_stats, &vp->estats, sizeof(struct vector_estats));
+}
+
+static int vector_get_coalesce(struct net_device *netdev,
+ struct ethtool_coalesce *ec)
+{
+ struct vector_private *vp = netdev_priv(netdev);
+
+ ec->tx_coalesce_usecs = (vp->coalesce * 1000000) / HZ;
+ return 0;
+}
+
+static int vector_set_coalesce(struct net_device *netdev,
+ struct ethtool_coalesce *ec)
+{
+ struct vector_private *vp = netdev_priv(netdev);
+
+ vp->coalesce = (ec->tx_coalesce_usecs * HZ) / 1000000;
+ if (vp->coalesce == 0)
+ vp->coalesce = 1;
+ return 0;
+}
+
+static const struct ethtool_ops vector_net_ethtool_ops = {
+ .get_drvinfo = vector_net_get_drvinfo,
+ .get_link = ethtool_op_get_link,
+ .get_ts_info = ethtool_op_get_ts_info,
+ .get_ringparam = vector_get_ringparam,
+ .get_strings = vector_get_strings,
+ .get_sset_count = vector_get_sset_count,
+ .get_ethtool_stats = vector_get_ethtool_stats,
+ .get_coalesce = vector_get_coalesce,
+ .set_coalesce = vector_set_coalesce,
+};
+
+
+static const struct net_device_ops vector_netdev_ops = {
+ .ndo_open = vector_net_open,
+ .ndo_stop = vector_net_close,
+ .ndo_start_xmit = vector_net_start_xmit,
+ .ndo_set_rx_mode = vector_net_set_multicast_list,
+ .ndo_tx_timeout = vector_net_tx_timeout,
+ .ndo_set_mac_address = eth_mac_addr,
+ .ndo_validate_addr = eth_validate_addr,
+ .ndo_fix_features = vector_fix_features,
+ .ndo_set_features = vector_set_features,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = vector_net_poll_controller,
+#endif
+};
+
+
+static void vector_timer_expire(struct timer_list *t)
+{
+ struct vector_private *vp = from_timer(vp, t, tl);
+
+ vp->estats.tx_kicks++;
+ vector_send(vp->tx_queue);
+}
+
+static void vector_eth_configure(
+ int n,
+ struct arglist *def
+ )
+{
+ struct vector_device *device;
+ struct net_device *dev;
+ struct vector_private *vp;
+ int err;
+
+ device = kzalloc(sizeof(*device), GFP_KERNEL);
+ if (device == NULL) {
+ printk(KERN_ERR "eth_configure failed to allocate struct "
+ "vector_device\n");
+ return;
+ }
+ dev = alloc_etherdev(sizeof(struct vector_private));
+ if (dev == NULL) {
+ printk(KERN_ERR "eth_configure: failed to allocate struct "
+ "net_device for vec%d\n", n);
+ goto out_free_device;
+ }
+
+ dev->mtu = get_mtu(def);
+
+ INIT_LIST_HEAD(&device->list);
+ device->unit = n;
+
+ /* If this name ends up conflicting with an existing registered
+ * netdevice, that is OK, register_netdev{,ice}() will notice this
+ * and fail.
+ */
+ snprintf(dev->name, sizeof(dev->name), "vec%d", n);
+ uml_net_setup_etheraddr(dev, uml_vector_fetch_arg(def, "mac"));
+ vp = netdev_priv(dev);
+
+ /* sysfs register */
+ if (!driver_registered) {
+ platform_driver_register(&uml_net_driver);
+ driver_registered = 1;
+ }
+ device->pdev.id = n;
+ device->pdev.name = DRIVER_NAME;
+ device->pdev.dev.release = vector_device_release;
+ dev_set_drvdata(&device->pdev.dev, device);
+ if (platform_device_register(&device->pdev))
+ goto out_free_netdev;
+ SET_NETDEV_DEV(dev, &device->pdev.dev);
+
+ device->dev = dev;
+
+ *vp = ((struct vector_private)
+ {
+ .list = LIST_HEAD_INIT(vp->list),
+ .dev = dev,
+ .unit = n,
+ .options = get_transport_options(def),
+ .rx_irq = 0,
+ .tx_irq = 0,
+ .parsed = def,
+ .max_packet = get_mtu(def) + ETH_HEADER_OTHER,
+ /* TODO - we need to calculate headroom so that ip header
+ * is 16 byte aligned all the time
+ */
+ .headroom = get_headroom(def),
+ .form_header = NULL,
+ .verify_header = NULL,
+ .header_rxbuffer = NULL,
+ .header_txbuffer = NULL,
+ .header_size = 0,
+ .rx_header_size = 0,
+ .rexmit_scheduled = false,
+ .opened = false,
+ .transport_data = NULL,
+ .in_write_poll = false,
+ .coalesce = 2,
+ .req_size = get_req_size(def)
+ });
+
+ dev->features = dev->hw_features = (NETIF_F_SG | NETIF_F_FRAGLIST);
+ tasklet_init(&vp->tx_poll, vector_tx_poll, (unsigned long)vp);
+ INIT_WORK(&vp->reset_tx, vector_reset_tx);
+
+ timer_setup(&vp->tl, vector_timer_expire, 0);
+ spin_lock_init(&vp->lock);
+
+ /* FIXME */
+ dev->netdev_ops = &vector_netdev_ops;
+ dev->ethtool_ops = &vector_net_ethtool_ops;
+ dev->watchdog_timeo = (HZ >> 1);
+ /* primary IRQ - fixme */
+ dev->irq = 0; /* we will adjust this once opened */
+
+ rtnl_lock();
+ err = register_netdevice(dev);
+ rtnl_unlock();
+ if (err)
+ goto out_undo_user_init;
+
+ spin_lock(&vector_devices_lock);
+ list_add(&device->list, &vector_devices);
+ spin_unlock(&vector_devices_lock);
+
+ return;
+
+out_undo_user_init:
+ return;
+out_free_netdev:
+ free_netdev(dev);
+out_free_device:
+ kfree(device);
+}
+
+
+
+
+/*
+ * Invoked late in the init
+ */
+
+static int __init vector_init(void)
+{
+ struct list_head *ele;
+ struct vector_cmd_line_arg *def;
+ struct arglist *parsed;
+
+ list_for_each(ele, &vec_cmd_line) {
+ def = list_entry(ele, struct vector_cmd_line_arg, list);
+ parsed = uml_parse_vector_ifspec(def->arguments);
+ if (parsed != NULL)
+ vector_eth_configure(def->unit, parsed);
+ }
+ return 0;
+}
+
+
+/* Invoked at initial argument parsing, only stores
+ * arguments until a proper vector_init is called
+ * later
+ */
+
+static int __init vector_setup(char *str)
+{
+ char *error;
+ int n, err;
+ struct vector_cmd_line_arg *new;
+
+ err = vector_parse(str, &n, &str, &error);
+ if (err) {
+ printk(KERN_ERR "vector_setup - Couldn't parse '%s' : %s\n",
+ str, error);
+ return 1;
+ }
+ new = alloc_bootmem(sizeof(*new));
+ INIT_LIST_HEAD(&new->list);
+ new->unit = n;
+ new->arguments = str;
+ list_add_tail(&new->list, &vec_cmd_line);
+ return 1;
+}
+
+__setup("vec", vector_setup);
+__uml_help(vector_setup,
+"vec[0-9]+:<option>=<value>,<option>=<value>\n"
+" Configure a vector io network device.\n\n"
+);
+
+late_initcall(vector_init);
+
+static struct mc_device vector_mc = {
+ .list = LIST_HEAD_INIT(vector_mc.list),
+ .name = "vec",
+ .config = vector_config,
+ .get_config = NULL,
+ .id = vector_id,
+ .remove = vector_remove,
+};
+
+#ifdef CONFIG_INET
+static int vector_inetaddr_event(
+ struct notifier_block *this,
+ unsigned long event,
+ void *ptr)
+{
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block vector_inetaddr_notifier = {
+ .notifier_call = vector_inetaddr_event,
+};
+
+static void inet_register(void)
+{
+ register_inetaddr_notifier(&vector_inetaddr_notifier);
+}
+#else
+static inline void inet_register(void)
+{
+}
+#endif
+
+static int vector_net_init(void)
+{
+ mconsole_register_dev(&vector_mc);
+ inet_register();
+ return 0;
+}
+
+__initcall(vector_net_init);
+
+
+
diff --git a/arch/um/drivers/vector_kern.h b/arch/um/drivers/vector_kern.h
new file mode 100644
index 000000000000..0b0a767b9076
--- /dev/null
+++ b/arch/um/drivers/vector_kern.h
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2002 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_VECTOR_KERN_H
+#define __UM_VECTOR_KERN_H
+
+#include <linux/netdevice.h>
+#include <linux/platform_device.h>
+#include <linux/skbuff.h>
+#include <linux/socket.h>
+#include <linux/list.h>
+#include <linux/ctype.h>
+#include <linux/workqueue.h>
+#include <linux/interrupt.h>
+#include "vector_user.h"
+
+/* Queue structure specially adapted for multiple enqueue/dequeue
+ * in a mmsgrecv/mmsgsend context
+ */
+
+/* Dequeue method */
+
+#define QUEUE_SENDMSG 0
+#define QUEUE_SENDMMSG 1
+
+#define VECTOR_RX 1
+#define VECTOR_TX (1 << 1)
+#define VECTOR_BPF (1 << 2)
+#define VECTOR_QDISC_BYPASS (1 << 3)
+
+#define ETH_MAX_PACKET 1500
+#define ETH_HEADER_OTHER 32 /* just in case someone decides to go mad on QnQ */
+
+struct vector_queue {
+ struct mmsghdr *mmsg_vector;
+ void **skbuff_vector;
+ /* backlink to device which owns us */
+ struct net_device *dev;
+ spinlock_t head_lock;
+ spinlock_t tail_lock;
+ int queue_depth, head, tail, max_depth, max_iov_frags;
+ short options;
+};
+
+struct vector_estats {
+ uint64_t rx_queue_max;
+ uint64_t rx_queue_running_average;
+ uint64_t tx_queue_max;
+ uint64_t tx_queue_running_average;
+ uint64_t rx_encaps_errors;
+ uint64_t tx_timeout_count;
+ uint64_t tx_restart_queue;
+ uint64_t tx_kicks;
+ uint64_t tx_flow_control_xon;
+ uint64_t tx_flow_control_xoff;
+ uint64_t rx_csum_offload_good;
+ uint64_t rx_csum_offload_errors;
+ uint64_t sg_ok;
+ uint64_t sg_linearized;
+};
+
+#define VERIFY_HEADER_NOK -1
+#define VERIFY_HEADER_OK 0
+#define VERIFY_CSUM_OK 1
+
+struct vector_private {
+ struct list_head list;
+ spinlock_t lock;
+ struct net_device *dev;
+
+ int unit;
+
+ /* Timeout timer in TX */
+
+ struct timer_list tl;
+
+ /* Scheduled "remove device" work */
+ struct work_struct reset_tx;
+ struct vector_fds *fds;
+
+ struct vector_queue *rx_queue;
+ struct vector_queue *tx_queue;
+
+ int rx_irq;
+ int tx_irq;
+
+ struct arglist *parsed;
+
+ void *transport_data; /* transport specific params if needed */
+
+ int max_packet;
+ int req_size; /* different from max packet - used for TSO */
+ int headroom;
+
+ int options;
+
+ /* remote address if any - some transports will leave this as null */
+
+ int header_size;
+ int rx_header_size;
+ int coalesce;
+
+ void *header_rxbuffer;
+ void *header_txbuffer;
+
+ int (*form_header)(uint8_t *header,
+ struct sk_buff *skb, struct vector_private *vp);
+ int (*verify_header)(uint8_t *header,
+ struct sk_buff *skb, struct vector_private *vp);
+
+ spinlock_t stats_lock;
+
+ struct tasklet_struct tx_poll;
+ bool rexmit_scheduled;
+ bool opened;
+ bool in_write_poll;
+
+ /* ethtool stats */
+
+ struct vector_estats estats;
+ void *bpf;
+
+ char user[0];
+};
+
+extern int build_transport_data(struct vector_private *vp);
+
+#endif
diff --git a/arch/um/drivers/vector_transports.c b/arch/um/drivers/vector_transports.c
new file mode 100644
index 000000000000..9065047f844b
--- /dev/null
+++ b/arch/um/drivers/vector_transports.c
@@ -0,0 +1,458 @@
+/*
+ * Copyright (C) 2017 - Cambridge Greys Limited
+ * Copyright (C) 2011 - 2014 Cisco Systems Inc
+ * Licensed under the GPL.
+ */
+
+#include <linux/etherdevice.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <asm/byteorder.h>
+#include <uapi/linux/ip.h>
+#include <uapi/linux/virtio_net.h>
+#include <linux/virtio_net.h>
+#include <linux/virtio_byteorder.h>
+#include <linux/netdev_features.h>
+#include "vector_user.h"
+#include "vector_kern.h"
+
+#define GOOD_LINEAR 512
+#define GSO_ERROR "Incoming GSO frames and GRO disabled on the interface"
+
+struct gre_minimal_header {
+ uint16_t header;
+ uint16_t arptype;
+};
+
+
+struct uml_gre_data {
+ uint32_t rx_key;
+ uint32_t tx_key;
+ uint32_t sequence;
+
+ bool ipv6;
+ bool has_sequence;
+ bool pin_sequence;
+ bool checksum;
+ bool key;
+ struct gre_minimal_header expected_header;
+
+ uint32_t checksum_offset;
+ uint32_t key_offset;
+ uint32_t sequence_offset;
+
+};
+
+struct uml_l2tpv3_data {
+ uint64_t rx_cookie;
+ uint64_t tx_cookie;
+ uint64_t rx_session;
+ uint64_t tx_session;
+ uint32_t counter;
+
+ bool udp;
+ bool ipv6;
+ bool has_counter;
+ bool pin_counter;
+ bool cookie;
+ bool cookie_is_64;
+
+ uint32_t cookie_offset;
+ uint32_t session_offset;
+ uint32_t counter_offset;
+};
+
+static int l2tpv3_form_header(uint8_t *header,
+ struct sk_buff *skb, struct vector_private *vp)
+{
+ struct uml_l2tpv3_data *td = vp->transport_data;
+ uint32_t *counter;
+
+ if (td->udp)
+ *(uint32_t *) header = cpu_to_be32(L2TPV3_DATA_PACKET);
+ (*(uint32_t *) (header + td->session_offset)) = td->tx_session;
+
+ if (td->cookie) {
+ if (td->cookie_is_64)
+ (*(uint64_t *)(header + td->cookie_offset)) =
+ td->tx_cookie;
+ else
+ (*(uint32_t *)(header + td->cookie_offset)) =
+ td->tx_cookie;
+ }
+ if (td->has_counter) {
+ counter = (uint32_t *)(header + td->counter_offset);
+ if (td->pin_counter) {
+ *counter = 0;
+ } else {
+ td->counter++;
+ *counter = cpu_to_be32(td->counter);
+ }
+ }
+ return 0;
+}
+
+static int gre_form_header(uint8_t *header,
+ struct sk_buff *skb, struct vector_private *vp)
+{
+ struct uml_gre_data *td = vp->transport_data;
+ uint32_t *sequence;
+ *((uint32_t *) header) = *((uint32_t *) &td->expected_header);
+ if (td->key)
+ (*(uint32_t *) (header + td->key_offset)) = td->tx_key;
+ if (td->has_sequence) {
+ sequence = (uint32_t *)(header + td->sequence_offset);
+ if (td->pin_sequence)
+ *sequence = 0;
+ else
+ *sequence = cpu_to_be32(++td->sequence);
+ }
+ return 0;
+}
+
+static int raw_form_header(uint8_t *header,
+ struct sk_buff *skb, struct vector_private *vp)
+{
+ struct virtio_net_hdr *vheader = (struct virtio_net_hdr *) header;
+
+ virtio_net_hdr_from_skb(
+ skb,
+ vheader,
+ virtio_legacy_is_little_endian(),
+ false
+ );
+
+ return 0;
+}
+
+static int l2tpv3_verify_header(
+ uint8_t *header, struct sk_buff *skb, struct vector_private *vp)
+{
+ struct uml_l2tpv3_data *td = vp->transport_data;
+ uint32_t *session;
+ uint64_t cookie;
+
+ if ((!td->udp) && (!td->ipv6))
+ header += sizeof(struct iphdr) /* fix for ipv4 raw */;
+
+ /* we do not do a strict check for "data" packets as per
+ * the RFC spec because the pure IP spec does not have
+ * that anyway.
+ */
+
+ if (td->cookie) {
+ if (td->cookie_is_64)
+ cookie = *(uint64_t *)(header + td->cookie_offset);
+ else
+ cookie = *(uint32_t *)(header + td->cookie_offset);
+ if (cookie != td->rx_cookie) {
+ if (net_ratelimit())
+ netdev_err(vp->dev, "uml_l2tpv3: unknown cookie id");
+ return -1;
+ }
+ }
+ session = (uint32_t *) (header + td->session_offset);
+ if (*session != td->rx_session) {
+ if (net_ratelimit())
+ netdev_err(vp->dev, "uml_l2tpv3: session mismatch");
+ return -1;
+ }
+ return 0;
+}
+
+static int gre_verify_header(
+ uint8_t *header, struct sk_buff *skb, struct vector_private *vp)
+{
+
+ uint32_t key;
+ struct uml_gre_data *td = vp->transport_data;
+
+ if (!td->ipv6)
+ header += sizeof(struct iphdr) /* fix for ipv4 raw */;
+
+ if (*((uint32_t *) header) != *((uint32_t *) &td->expected_header)) {
+ if (net_ratelimit())
+ netdev_err(vp->dev, "header type disagreement, expecting %0x, got %0x",
+ *((uint32_t *) &td->expected_header),
+ *((uint32_t *) header)
+ );
+ return -1;
+ }
+
+ if (td->key) {
+ key = (*(uint32_t *)(header + td->key_offset));
+ if (key != td->rx_key) {
+ if (net_ratelimit())
+ netdev_err(vp->dev, "unknown key id %0x, expecting %0x",
+ key, td->rx_key);
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static int raw_verify_header(
+ uint8_t *header, struct sk_buff *skb, struct vector_private *vp)
+{
+ struct virtio_net_hdr *vheader = (struct virtio_net_hdr *) header;
+
+ if ((vheader->gso_type != VIRTIO_NET_HDR_GSO_NONE) &&
+ (vp->req_size != 65536)) {
+ if (net_ratelimit())
+ netdev_err(
+ vp->dev,
+ GSO_ERROR
+ );
+ }
+ if ((vheader->flags & VIRTIO_NET_HDR_F_DATA_VALID) > 0)
+ return 1;
+
+ virtio_net_hdr_to_skb(skb, vheader, virtio_legacy_is_little_endian());
+ return 0;
+}
+
+static bool get_uint_param(
+ struct arglist *def, char *param, unsigned int *result)
+{
+ char *arg = uml_vector_fetch_arg(def, param);
+
+ if (arg != NULL) {
+ if (kstrtoint(arg, 0, result) == 0)
+ return true;
+ }
+ return false;
+}
+
+static bool get_ulong_param(
+ struct arglist *def, char *param, unsigned long *result)
+{
+ char *arg = uml_vector_fetch_arg(def, param);
+
+ if (arg != NULL) {
+ if (kstrtoul(arg, 0, result) == 0)
+ return true;
+ return true;
+ }
+ return false;
+}
+
+static int build_gre_transport_data(struct vector_private *vp)
+{
+ struct uml_gre_data *td;
+ int temp_int;
+ int temp_rx;
+ int temp_tx;
+
+ vp->transport_data = kmalloc(sizeof(struct uml_gre_data), GFP_KERNEL);
+ if (vp->transport_data == NULL)
+ return -ENOMEM;
+ td = vp->transport_data;
+ td->sequence = 0;
+
+ td->expected_header.arptype = GRE_IRB;
+ td->expected_header.header = 0;
+
+ vp->form_header = &gre_form_header;
+ vp->verify_header = &gre_verify_header;
+ vp->header_size = 4;
+ td->key_offset = 4;
+ td->sequence_offset = 4;
+ td->checksum_offset = 4;
+
+ td->ipv6 = false;
+ if (get_uint_param(vp->parsed, "v6", &temp_int)) {
+ if (temp_int > 0)
+ td->ipv6 = true;
+ }
+ td->key = false;
+ if (get_uint_param(vp->parsed, "rx_key", &temp_rx)) {
+ if (get_uint_param(vp->parsed, "tx_key", &temp_tx)) {
+ td->key = true;
+ td->expected_header.header |= GRE_MODE_KEY;
+ td->rx_key = cpu_to_be32(temp_rx);
+ td->tx_key = cpu_to_be32(temp_tx);
+ vp->header_size += 4;
+ td->sequence_offset += 4;
+ } else {
+ return -EINVAL;
+ }
+ }
+
+ td->sequence = false;
+ if (get_uint_param(vp->parsed, "sequence", &temp_int)) {
+ if (temp_int > 0) {
+ vp->header_size += 4;
+ td->has_sequence = true;
+ td->expected_header.header |= GRE_MODE_SEQUENCE;
+ if (get_uint_param(
+ vp->parsed, "pin_sequence", &temp_int)) {
+ if (temp_int > 0)
+ td->pin_sequence = true;
+ }
+ }
+ }
+ vp->rx_header_size = vp->header_size;
+ if (!td->ipv6)
+ vp->rx_header_size += sizeof(struct iphdr);
+ return 0;
+}
+
+static int build_l2tpv3_transport_data(struct vector_private *vp)
+{
+
+ struct uml_l2tpv3_data *td;
+ int temp_int, temp_rxs, temp_txs;
+ unsigned long temp_rx;
+ unsigned long temp_tx;
+
+ vp->transport_data = kmalloc(
+ sizeof(struct uml_l2tpv3_data), GFP_KERNEL);
+
+ if (vp->transport_data == NULL)
+ return -ENOMEM;
+
+ td = vp->transport_data;
+
+ vp->form_header = &l2tpv3_form_header;
+ vp->verify_header = &l2tpv3_verify_header;
+ td->counter = 0;
+
+ vp->header_size = 4;
+ td->session_offset = 0;
+ td->cookie_offset = 4;
+ td->counter_offset = 4;
+
+
+ td->ipv6 = false;
+ if (get_uint_param(vp->parsed, "v6", &temp_int)) {
+ if (temp_int > 0)
+ td->ipv6 = true;
+ }
+
+ if (get_uint_param(vp->parsed, "rx_session", &temp_rxs)) {
+ if (get_uint_param(vp->parsed, "tx_session", &temp_txs)) {
+ td->tx_session = cpu_to_be32(temp_txs);
+ td->rx_session = cpu_to_be32(temp_rxs);
+ } else {
+ return -EINVAL;
+ }
+ } else {
+ return -EINVAL;
+ }
+
+ td->cookie_is_64 = false;
+ if (get_uint_param(vp->parsed, "cookie64", &temp_int)) {
+ if (temp_int > 0)
+ td->cookie_is_64 = true;
+ }
+ td->cookie = false;
+ if (get_ulong_param(vp->parsed, "rx_cookie", &temp_rx)) {
+ if (get_ulong_param(vp->parsed, "tx_cookie", &temp_tx)) {
+ td->cookie = true;
+ if (td->cookie_is_64) {
+ td->rx_cookie = cpu_to_be64(temp_rx);
+ td->tx_cookie = cpu_to_be64(temp_tx);
+ vp->header_size += 8;
+ td->counter_offset += 8;
+ } else {
+ td->rx_cookie = cpu_to_be32(temp_rx);
+ td->tx_cookie = cpu_to_be32(temp_tx);
+ vp->header_size += 4;
+ td->counter_offset += 4;
+ }
+ } else {
+ return -EINVAL;
+ }
+ }
+
+ td->has_counter = false;
+ if (get_uint_param(vp->parsed, "counter", &temp_int)) {
+ if (temp_int > 0) {
+ td->has_counter = true;
+ vp->header_size += 4;
+ if (get_uint_param(
+ vp->parsed, "pin_counter", &temp_int)) {
+ if (temp_int > 0)
+ td->pin_counter = true;
+ }
+ }
+ }
+
+ if (get_uint_param(vp->parsed, "udp", &temp_int)) {
+ if (temp_int > 0) {
+ td->udp = true;
+ vp->header_size += 4;
+ td->counter_offset += 4;
+ td->session_offset += 4;
+ td->cookie_offset += 4;
+ }
+ }
+
+ vp->rx_header_size = vp->header_size;
+ if ((!td->ipv6) && (!td->udp))
+ vp->rx_header_size += sizeof(struct iphdr);
+
+ return 0;
+}
+
+static int build_raw_transport_data(struct vector_private *vp)
+{
+ if (uml_raw_enable_vnet_headers(vp->fds->rx_fd)) {
+ if (!uml_raw_enable_vnet_headers(vp->fds->tx_fd))
+ return -1;
+ vp->form_header = &raw_form_header;
+ vp->verify_header = &raw_verify_header;
+ vp->header_size = sizeof(struct virtio_net_hdr);
+ vp->rx_header_size = sizeof(struct virtio_net_hdr);
+ vp->dev->hw_features |= (NETIF_F_TSO | NETIF_F_GRO);
+ vp->dev->features |=
+ (NETIF_F_RXCSUM | NETIF_F_HW_CSUM |
+ NETIF_F_TSO | NETIF_F_GRO);
+ netdev_info(
+ vp->dev,
+ "raw: using vnet headers for tso and tx/rx checksum"
+ );
+ }
+ return 0;
+}
+
+static int build_tap_transport_data(struct vector_private *vp)
+{
+ if (uml_raw_enable_vnet_headers(vp->fds->rx_fd)) {
+ vp->form_header = &raw_form_header;
+ vp->verify_header = &raw_verify_header;
+ vp->header_size = sizeof(struct virtio_net_hdr);
+ vp->rx_header_size = sizeof(struct virtio_net_hdr);
+ vp->dev->hw_features |=
+ (NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GRO);
+ vp->dev->features |=
+ (NETIF_F_RXCSUM | NETIF_F_HW_CSUM |
+ NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GRO);
+ netdev_info(
+ vp->dev,
+ "tap/raw: using vnet headers for tso and tx/rx checksum"
+ );
+ } else {
+ return 0; /* do not try to enable tap too if raw failed */
+ }
+ if (uml_tap_enable_vnet_headers(vp->fds->tx_fd))
+ return 0;
+ return -1;
+}
+
+int build_transport_data(struct vector_private *vp)
+{
+ char *transport = uml_vector_fetch_arg(vp->parsed, "transport");
+
+ if (strncmp(transport, TRANS_GRE, TRANS_GRE_LEN) == 0)
+ return build_gre_transport_data(vp);
+ if (strncmp(transport, TRANS_L2TPV3, TRANS_L2TPV3_LEN) == 0)
+ return build_l2tpv3_transport_data(vp);
+ if (strncmp(transport, TRANS_RAW, TRANS_RAW_LEN) == 0)
+ return build_raw_transport_data(vp);
+ if (strncmp(transport, TRANS_TAP, TRANS_TAP_LEN) == 0)
+ return build_tap_transport_data(vp);
+ return 0;
+}
+
diff --git a/arch/um/drivers/vector_user.c b/arch/um/drivers/vector_user.c
new file mode 100644
index 000000000000..4d6a78e31089
--- /dev/null
+++ b/arch/um/drivers/vector_user.c
@@ -0,0 +1,590 @@
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <stddef.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <linux/if_tun.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <net/ethernet.h>
+#include <netinet/ip.h>
+#include <netinet/ether.h>
+#include <linux/if_ether.h>
+#include <linux/if_packet.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <linux/virtio_net.h>
+#include <netdb.h>
+#include <stdlib.h>
+#include <os.h>
+#include <um_malloc.h>
+#include "vector_user.h"
+
+#define ID_GRE 0
+#define ID_L2TPV3 1
+#define ID_MAX 1
+
+#define TOKEN_IFNAME "ifname"
+
+#define TRANS_RAW "raw"
+#define TRANS_RAW_LEN strlen(TRANS_RAW)
+
+#define VNET_HDR_FAIL "could not enable vnet headers on fd %d"
+#define TUN_GET_F_FAIL "tapraw: TUNGETFEATURES failed: %s"
+#define L2TPV3_BIND_FAIL "l2tpv3_open : could not bind socket err=%i"
+#define BPF_ATTACH_FAIL "Failed to attach filter size %d to %d, err %d\n"
+
+/* This is very ugly and brute force lookup, but it is done
+ * only once at initialization so not worth doing hashes or
+ * anything more intelligent
+ */
+
+char *uml_vector_fetch_arg(struct arglist *ifspec, char *token)
+{
+ int i;
+
+ for (i = 0; i < ifspec->numargs; i++) {
+ if (strcmp(ifspec->tokens[i], token) == 0)
+ return ifspec->values[i];
+ }
+ return NULL;
+
+}
+
+struct arglist *uml_parse_vector_ifspec(char *arg)
+{
+ struct arglist *result;
+ int pos, len;
+ bool parsing_token = true, next_starts = true;
+
+ if (arg == NULL)
+ return NULL;
+ result = uml_kmalloc(sizeof(struct arglist), UM_GFP_KERNEL);
+ if (result == NULL)
+ return NULL;
+ result->numargs = 0;
+ len = strlen(arg);
+ for (pos = 0; pos < len; pos++) {
+ if (next_starts) {
+ if (parsing_token) {
+ result->tokens[result->numargs] = arg + pos;
+ } else {
+ result->values[result->numargs] = arg + pos;
+ result->numargs++;
+ }
+ next_starts = false;
+ }
+ if (*(arg + pos) == '=') {
+ if (parsing_token)
+ parsing_token = false;
+ else
+ goto cleanup;
+ next_starts = true;
+ (*(arg + pos)) = '\0';
+ }
+ if (*(arg + pos) == ',') {
+ parsing_token = true;
+ next_starts = true;
+ (*(arg + pos)) = '\0';
+ }
+ }
+ return result;
+cleanup:
+ printk(UM_KERN_ERR "vector_setup - Couldn't parse '%s'\n", arg);
+ kfree(result);
+ return NULL;
+}
+
+/*
+ * Socket/FD configuration functions. These return an structure
+ * of rx and tx descriptors to cover cases where these are not
+ * the same (f.e. read via raw socket and write via tap).
+ */
+
+#define PATH_NET_TUN "/dev/net/tun"
+
+static struct vector_fds *user_init_tap_fds(struct arglist *ifspec)
+{
+ struct ifreq ifr;
+ int fd = -1;
+ struct sockaddr_ll sock;
+ int err = -ENOMEM, offload;
+ char *iface;
+ struct vector_fds *result = NULL;
+
+ iface = uml_vector_fetch_arg(ifspec, TOKEN_IFNAME);
+ if (iface == NULL) {
+ printk(UM_KERN_ERR "uml_tap: failed to parse interface spec\n");
+ goto tap_cleanup;
+ }
+
+ result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL);
+ if (result == NULL) {
+ printk(UM_KERN_ERR "uml_tap: failed to allocate file descriptors\n");
+ goto tap_cleanup;
+ }
+ result->rx_fd = -1;
+ result->tx_fd = -1;
+ result->remote_addr = NULL;
+ result->remote_addr_size = 0;
+
+ /* TAP */
+
+ fd = open(PATH_NET_TUN, O_RDWR);
+ if (fd < 0) {
+ printk(UM_KERN_ERR "uml_tap: failed to open tun device\n");
+ goto tap_cleanup;
+ }
+ result->tx_fd = fd;
+ memset(&ifr, 0, sizeof(ifr));
+ ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_VNET_HDR;
+ strncpy((char *)&ifr.ifr_name, iface, sizeof(ifr.ifr_name) - 1);
+
+ err = ioctl(fd, TUNSETIFF, (void *) &ifr);
+ if (err != 0) {
+ printk(UM_KERN_ERR "uml_tap: failed to select tap interface\n");
+ goto tap_cleanup;
+ }
+
+ offload = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6;
+ ioctl(fd, TUNSETOFFLOAD, offload);
+
+ /* RAW */
+
+ fd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
+ if (fd == -1) {
+ printk(UM_KERN_ERR
+ "uml_tap: failed to create socket: %i\n", -errno);
+ goto tap_cleanup;
+ }
+ result->rx_fd = fd;
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy((char *)&ifr.ifr_name, iface, sizeof(ifr.ifr_name) - 1);
+ if (ioctl(fd, SIOCGIFINDEX, (void *) &ifr) < 0) {
+ printk(UM_KERN_ERR
+ "uml_tap: failed to set interface: %i\n", -errno);
+ goto tap_cleanup;
+ }
+
+ sock.sll_family = AF_PACKET;
+ sock.sll_protocol = htons(ETH_P_ALL);
+ sock.sll_ifindex = ifr.ifr_ifindex;
+
+ if (bind(fd,
+ (struct sockaddr *) &sock, sizeof(struct sockaddr_ll)) < 0) {
+ printk(UM_KERN_ERR
+ "user_init_tap: failed to bind raw pair, err %d\n",
+ -errno);
+ goto tap_cleanup;
+ }
+ return result;
+tap_cleanup:
+ printk(UM_KERN_ERR "user_init_tap: init failed, error %d", err);
+ if (result != NULL) {
+ if (result->rx_fd >= 0)
+ os_close_file(result->rx_fd);
+ if (result->tx_fd >= 0)
+ os_close_file(result->tx_fd);
+ kfree(result);
+ }
+ return NULL;
+}
+
+
+static struct vector_fds *user_init_raw_fds(struct arglist *ifspec)
+{
+ struct ifreq ifr;
+ int rxfd = -1, txfd = -1;
+ struct sockaddr_ll sock;
+ int err = -ENOMEM;
+ char *iface;
+ struct vector_fds *result = NULL;
+
+ iface = uml_vector_fetch_arg(ifspec, TOKEN_IFNAME);
+ if (iface == NULL)
+ goto cleanup;
+
+ rxfd = socket(AF_PACKET, SOCK_RAW, ETH_P_ALL);
+ if (rxfd == -1) {
+ err = -errno;
+ goto cleanup;
+ }
+ txfd = socket(AF_PACKET, SOCK_RAW, 0); /* Turn off RX on this fd */
+ if (txfd == -1) {
+ err = -errno;
+ goto cleanup;
+ }
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy((char *)&ifr.ifr_name, iface, sizeof(ifr.ifr_name) - 1);
+ if (ioctl(rxfd, SIOCGIFINDEX, (void *) &ifr) < 0) {
+ err = -errno;
+ goto cleanup;
+ }
+
+ sock.sll_family = AF_PACKET;
+ sock.sll_protocol = htons(ETH_P_ALL);
+ sock.sll_ifindex = ifr.ifr_ifindex;
+
+ if (bind(rxfd,
+ (struct sockaddr *) &sock, sizeof(struct sockaddr_ll)) < 0) {
+ err = -errno;
+ goto cleanup;
+ }
+
+ sock.sll_family = AF_PACKET;
+ sock.sll_protocol = htons(ETH_P_IP);
+ sock.sll_ifindex = ifr.ifr_ifindex;
+
+ if (bind(txfd,
+ (struct sockaddr *) &sock, sizeof(struct sockaddr_ll)) < 0) {
+ err = -errno;
+ goto cleanup;
+ }
+
+ result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL);
+ if (result != NULL) {
+ result->rx_fd = rxfd;
+ result->tx_fd = txfd;
+ result->remote_addr = NULL;
+ result->remote_addr_size = 0;
+ }
+ return result;
+cleanup:
+ printk(UM_KERN_ERR "user_init_raw: init failed, error %d", err);
+ if (rxfd >= 0)
+ os_close_file(rxfd);
+ if (txfd >= 0)
+ os_close_file(txfd);
+ if (result != NULL)
+ kfree(result);
+ return NULL;
+}
+
+
+bool uml_raw_enable_qdisc_bypass(int fd)
+{
+ int optval = 1;
+
+ if (setsockopt(fd,
+ SOL_PACKET, PACKET_QDISC_BYPASS,
+ &optval, sizeof(optval)) != 0) {
+ return false;
+ }
+ return true;
+}
+
+bool uml_raw_enable_vnet_headers(int fd)
+{
+ int optval = 1;
+
+ if (setsockopt(fd,
+ SOL_PACKET, PACKET_VNET_HDR,
+ &optval, sizeof(optval)) != 0) {
+ printk(UM_KERN_INFO VNET_HDR_FAIL, fd);
+ return false;
+ }
+ return true;
+}
+bool uml_tap_enable_vnet_headers(int fd)
+{
+ unsigned int features;
+ int len = sizeof(struct virtio_net_hdr);
+
+ if (ioctl(fd, TUNGETFEATURES, &features) == -1) {
+ printk(UM_KERN_INFO TUN_GET_F_FAIL, strerror(errno));
+ return false;
+ }
+ if ((features & IFF_VNET_HDR) == 0) {
+ printk(UM_KERN_INFO "tapraw: No VNET HEADER support");
+ return false;
+ }
+ ioctl(fd, TUNSETVNETHDRSZ, &len);
+ return true;
+}
+
+static struct vector_fds *user_init_socket_fds(struct arglist *ifspec, int id)
+{
+ int err = -ENOMEM;
+ int fd = -1, gairet;
+ struct addrinfo srchints;
+ struct addrinfo dsthints;
+ bool v6, udp;
+ char *value;
+ char *src, *dst, *srcport, *dstport;
+ struct addrinfo *gairesult = NULL;
+ struct vector_fds *result = NULL;
+
+
+ value = uml_vector_fetch_arg(ifspec, "v6");
+ v6 = false;
+ udp = false;
+ if (value != NULL) {
+ if (strtol((const char *) value, NULL, 10) > 0)
+ v6 = true;
+ }
+
+ value = uml_vector_fetch_arg(ifspec, "udp");
+ if (value != NULL) {
+ if (strtol((const char *) value, NULL, 10) > 0)
+ udp = true;
+ }
+ src = uml_vector_fetch_arg(ifspec, "src");
+ dst = uml_vector_fetch_arg(ifspec, "dst");
+ srcport = uml_vector_fetch_arg(ifspec, "srcport");
+ dstport = uml_vector_fetch_arg(ifspec, "dstport");
+
+ memset(&dsthints, 0, sizeof(dsthints));
+
+ if (v6)
+ dsthints.ai_family = AF_INET6;
+ else
+ dsthints.ai_family = AF_INET;
+
+ switch (id) {
+ case ID_GRE:
+ dsthints.ai_socktype = SOCK_RAW;
+ dsthints.ai_protocol = IPPROTO_GRE;
+ break;
+ case ID_L2TPV3:
+ if (udp) {
+ dsthints.ai_socktype = SOCK_DGRAM;
+ dsthints.ai_protocol = 0;
+ } else {
+ dsthints.ai_socktype = SOCK_RAW;
+ dsthints.ai_protocol = IPPROTO_L2TP;
+ }
+ break;
+ default:
+ printk(KERN_ERR "Unsupported socket type\n");
+ return NULL;
+ }
+ memcpy(&srchints, &dsthints, sizeof(struct addrinfo));
+
+ gairet = getaddrinfo(src, srcport, &dsthints, &gairesult);
+ if ((gairet != 0) || (gairesult == NULL)) {
+ printk(UM_KERN_ERR
+ "socket_open : could not resolve src, error = %s",
+ gai_strerror(gairet)
+ );
+ return NULL;
+ }
+ fd = socket(gairesult->ai_family,
+ gairesult->ai_socktype, gairesult->ai_protocol);
+ if (fd == -1) {
+ printk(UM_KERN_ERR
+ "socket_open : could not open socket, error = %d",
+ -errno
+ );
+ goto cleanup;
+ }
+ if (bind(fd,
+ (struct sockaddr *) gairesult->ai_addr,
+ gairesult->ai_addrlen)) {
+ printk(UM_KERN_ERR L2TPV3_BIND_FAIL, errno);
+ goto cleanup;
+ }
+
+ if (gairesult != NULL)
+ freeaddrinfo(gairesult);
+
+ gairesult = NULL;
+
+ gairet = getaddrinfo(dst, dstport, &dsthints, &gairesult);
+ if ((gairet != 0) || (gairesult == NULL)) {
+ printk(UM_KERN_ERR
+ "socket_open : could not resolve dst, error = %s",
+ gai_strerror(gairet)
+ );
+ return NULL;
+ }
+
+ result = uml_kmalloc(sizeof(struct vector_fds), UM_GFP_KERNEL);
+ if (result != NULL) {
+ result->rx_fd = fd;
+ result->tx_fd = fd;
+ result->remote_addr = uml_kmalloc(
+ gairesult->ai_addrlen, UM_GFP_KERNEL);
+ if (result->remote_addr == NULL)
+ goto cleanup;
+ result->remote_addr_size = gairesult->ai_addrlen;
+ memcpy(
+ result->remote_addr,
+ gairesult->ai_addr,
+ gairesult->ai_addrlen
+ );
+ }
+ freeaddrinfo(gairesult);
+ return result;
+cleanup:
+ if (gairesult != NULL)
+ freeaddrinfo(gairesult);
+ printk(UM_KERN_ERR "user_init_socket: init failed, error %d", err);
+ if (fd >= 0)
+ os_close_file(fd);
+ if (result != NULL) {
+ if (result->remote_addr != NULL)
+ kfree(result->remote_addr);
+ kfree(result);
+ }
+ return NULL;
+}
+
+struct vector_fds *uml_vector_user_open(
+ int unit,
+ struct arglist *parsed
+)
+{
+ char *transport;
+
+ if (parsed == NULL) {
+ printk(UM_KERN_ERR "no parsed config for unit %d\n", unit);
+ return NULL;
+ }
+ transport = uml_vector_fetch_arg(parsed, "transport");
+ if (transport == NULL) {
+ printk(UM_KERN_ERR "missing transport for unit %d\n", unit);
+ return NULL;
+ }
+ if (strncmp(transport, TRANS_RAW, TRANS_RAW_LEN) == 0)
+ return user_init_raw_fds(parsed);
+ if (strncmp(transport, TRANS_TAP, TRANS_TAP_LEN) == 0)
+ return user_init_tap_fds(parsed);
+ if (strncmp(transport, TRANS_GRE, TRANS_GRE_LEN) == 0)
+ return user_init_socket_fds(parsed, ID_GRE);
+ if (strncmp(transport, TRANS_L2TPV3, TRANS_L2TPV3_LEN) == 0)
+ return user_init_socket_fds(parsed, ID_L2TPV3);
+ return NULL;
+}
+
+
+int uml_vector_sendmsg(int fd, void *hdr, int flags)
+{
+ int n;
+
+ CATCH_EINTR(n = sendmsg(fd, (struct msghdr *) hdr, flags));
+ if ((n < 0) && (errno == EAGAIN))
+ return 0;
+ if (n >= 0)
+ return n;
+ else
+ return -errno;
+}
+
+int uml_vector_recvmsg(int fd, void *hdr, int flags)
+{
+ int n;
+
+ CATCH_EINTR(n = recvmsg(fd, (struct msghdr *) hdr, flags));
+ if ((n < 0) && (errno == EAGAIN))
+ return 0;
+ if (n >= 0)
+ return n;
+ else
+ return -errno;
+}
+
+int uml_vector_writev(int fd, void *hdr, int iovcount)
+{
+ int n;
+
+ CATCH_EINTR(n = writev(fd, (struct iovec *) hdr, iovcount));
+ if ((n < 0) && (errno == EAGAIN))
+ return 0;
+ if (n >= 0)
+ return n;
+ else
+ return -errno;
+}
+
+int uml_vector_sendmmsg(
+ int fd,
+ void *msgvec,
+ unsigned int vlen,
+ unsigned int flags)
+{
+ int n;
+
+ CATCH_EINTR(n = sendmmsg(fd, (struct mmsghdr *) msgvec, vlen, flags));
+ if ((n < 0) && (errno == EAGAIN))
+ return 0;
+ if (n >= 0)
+ return n;
+ else
+ return -errno;
+}
+
+int uml_vector_recvmmsg(
+ int fd,
+ void *msgvec,
+ unsigned int vlen,
+ unsigned int flags)
+{
+ int n;
+
+ CATCH_EINTR(
+ n = recvmmsg(fd, (struct mmsghdr *) msgvec, vlen, flags, 0));
+ if ((n < 0) && (errno == EAGAIN))
+ return 0;
+ if (n >= 0)
+ return n;
+ else
+ return -errno;
+}
+int uml_vector_attach_bpf(int fd, void *bpf, int bpf_len)
+{
+ int err = setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, bpf, bpf_len);
+
+ if (err < 0)
+ printk(KERN_ERR BPF_ATTACH_FAIL, bpf_len, fd, -errno);
+ return err;
+}
+
+#define DEFAULT_BPF_LEN 6
+
+void *uml_vector_default_bpf(int fd, void *mac)
+{
+ struct sock_filter *bpf;
+ uint32_t *mac1 = (uint32_t *)(mac + 2);
+ uint16_t *mac2 = (uint16_t *) mac;
+ struct sock_fprog bpf_prog = {
+ .len = 6,
+ .filter = NULL,
+ };
+
+ bpf = uml_kmalloc(
+ sizeof(struct sock_filter) * DEFAULT_BPF_LEN, UM_GFP_KERNEL);
+ if (bpf != NULL) {
+ bpf_prog.filter = bpf;
+ /* ld [8] */
+ bpf[0] = (struct sock_filter){ 0x20, 0, 0, 0x00000008 };
+ /* jeq #0xMAC[2-6] jt 2 jf 5*/
+ bpf[1] = (struct sock_filter){ 0x15, 0, 3, ntohl(*mac1)};
+ /* ldh [6] */
+ bpf[2] = (struct sock_filter){ 0x28, 0, 0, 0x00000006 };
+ /* jeq #0xMAC[0-1] jt 4 jf 5 */
+ bpf[3] = (struct sock_filter){ 0x15, 0, 1, ntohs(*mac2)};
+ /* ret #0 */
+ bpf[4] = (struct sock_filter){ 0x6, 0, 0, 0x00000000 };
+ /* ret #0x40000 */
+ bpf[5] = (struct sock_filter){ 0x6, 0, 0, 0x00040000 };
+ if (uml_vector_attach_bpf(
+ fd, &bpf_prog, sizeof(struct sock_fprog)) < 0) {
+ kfree(bpf);
+ bpf = NULL;
+ }
+ }
+ return bpf;
+}
+
diff --git a/arch/um/drivers/vector_user.h b/arch/um/drivers/vector_user.h
new file mode 100644
index 000000000000..d7cbff73b7ff
--- /dev/null
+++ b/arch/um/drivers/vector_user.h
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2002 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_VECTOR_USER_H
+#define __UM_VECTOR_USER_H
+
+#define MAXVARGS 20
+
+#define TOKEN_IFNAME "ifname"
+
+#define TRANS_RAW "raw"
+#define TRANS_RAW_LEN strlen(TRANS_RAW)
+
+#define TRANS_TAP "tap"
+#define TRANS_TAP_LEN strlen(TRANS_TAP)
+
+
+#define TRANS_GRE "gre"
+#define TRANS_GRE_LEN strlen(TRANS_RAW)
+
+#define TRANS_L2TPV3 "l2tpv3"
+#define TRANS_L2TPV3_LEN strlen(TRANS_L2TPV3)
+
+#ifndef IPPROTO_GRE
+#define IPPROTO_GRE 0x2F
+#endif
+
+#define GRE_MODE_CHECKSUM cpu_to_be16(8 << 12) /* checksum */
+#define GRE_MODE_RESERVED cpu_to_be16(4 << 12) /* unused */
+#define GRE_MODE_KEY cpu_to_be16(2 << 12) /* KEY present */
+#define GRE_MODE_SEQUENCE cpu_to_be16(1 << 12) /* sequence */
+
+#define GRE_IRB cpu_to_be16(0x6558)
+
+#define L2TPV3_DATA_PACKET 0x30000
+
+/* IANA-assigned IP protocol ID for L2TPv3 */
+
+#ifndef IPPROTO_L2TP
+#define IPPROTO_L2TP 0x73
+#endif
+
+struct arglist {
+ int numargs;
+ char *tokens[MAXVARGS];
+ char *values[MAXVARGS];
+};
+
+/* Separating read and write FDs allows us to have different
+ * rx and tx method. Example - read tap via raw socket using
+ * recvmmsg, write using legacy tap write calls
+ */
+
+struct vector_fds {
+ int rx_fd;
+ int tx_fd;
+ void *remote_addr;
+ int remote_addr_size;
+};
+
+#define VECTOR_READ 1
+#define VECTOR_WRITE (1 < 1)
+#define VECTOR_HEADERS (1 < 2)
+
+extern struct arglist *uml_parse_vector_ifspec(char *arg);
+
+extern struct vector_fds *uml_vector_user_open(
+ int unit,
+ struct arglist *parsed
+);
+
+extern char *uml_vector_fetch_arg(
+ struct arglist *ifspec,
+ char *token
+);
+
+extern int uml_vector_recvmsg(int fd, void *hdr, int flags);
+extern int uml_vector_sendmsg(int fd, void *hdr, int flags);
+extern int uml_vector_writev(int fd, void *hdr, int iovcount);
+extern int uml_vector_sendmmsg(
+ int fd, void *msgvec,
+ unsigned int vlen,
+ unsigned int flags
+);
+extern int uml_vector_recvmmsg(
+ int fd,
+ void *msgvec,
+ unsigned int vlen,
+ unsigned int flags
+);
+extern void *uml_vector_default_bpf(int fd, void *mac);
+extern int uml_vector_attach_bpf(int fd, void *bpf, int bpf_len);
+extern bool uml_raw_enable_qdisc_bypass(int fd);
+extern bool uml_raw_enable_vnet_headers(int fd);
+extern bool uml_tap_enable_vnet_headers(int fd);
+
+
+#endif
diff --git a/arch/um/include/asm/asm-prototypes.h b/arch/um/include/asm/asm-prototypes.h
new file mode 100644
index 000000000000..5898a26daa0d
--- /dev/null
+++ b/arch/um/include/asm/asm-prototypes.h
@@ -0,0 +1 @@
+#include <asm-generic/asm-prototypes.h>
diff --git a/arch/um/include/asm/irq.h b/arch/um/include/asm/irq.h
index b5cdd3f91157..49ed3e35b35a 100644
--- a/arch/um/include/asm/irq.h
+++ b/arch/um/include/asm/irq.h
@@ -18,7 +18,19 @@
#define XTERM_IRQ 13
#define RANDOM_IRQ 14
+#ifdef CONFIG_UML_NET_VECTOR
+
+#define VECTOR_BASE_IRQ 15
+#define VECTOR_IRQ_SPACE 8
+
+#define LAST_IRQ (VECTOR_IRQ_SPACE + VECTOR_BASE_IRQ)
+
+#else
+
#define LAST_IRQ RANDOM_IRQ
+
+#endif
+
#define NR_IRQS (LAST_IRQ + 1)
#endif
diff --git a/arch/um/include/shared/irq_user.h b/arch/um/include/shared/irq_user.h
index df5633053957..a7a6120f19d5 100644
--- a/arch/um/include/shared/irq_user.h
+++ b/arch/um/include/shared/irq_user.h
@@ -7,6 +7,7 @@
#define __IRQ_USER_H__
#include <sysdep/ptrace.h>
+#include <stdbool.h>
struct irq_fd {
struct irq_fd *next;
@@ -15,10 +16,17 @@ struct irq_fd {
int type;
int irq;
int events;
- int current_events;
+ bool active;
+ bool pending;
+ bool purge;
};
-enum { IRQ_READ, IRQ_WRITE };
+#define IRQ_READ 0
+#define IRQ_WRITE 1
+#define IRQ_NONE 2
+#define MAX_IRQ_TYPE (IRQ_NONE + 1)
+
+
struct siginfo;
extern void sigio_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs);
diff --git a/arch/um/include/shared/net_kern.h b/arch/um/include/shared/net_kern.h
index 012ac87d4900..40442b98b173 100644
--- a/arch/um/include/shared/net_kern.h
+++ b/arch/um/include/shared/net_kern.h
@@ -65,5 +65,7 @@ extern int tap_setup_common(char *str, char *type, char **dev_name,
char **mac_out, char **gate_addr);
extern void register_transport(struct transport *new);
extern unsigned short eth_protocol(struct sk_buff *skb);
+extern void uml_net_setup_etheraddr(struct net_device *dev, char *str);
+
#endif
diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
index d8ddaf9790d2..048ae37eb5aa 100644
--- a/arch/um/include/shared/os.h
+++ b/arch/um/include/shared/os.h
@@ -290,15 +290,16 @@ extern void halt_skas(void);
extern void reboot_skas(void);
/* irq.c */
-extern int os_waiting_for_events(struct irq_fd *active_fds);
-extern int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds);
-extern void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
- struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2);
-extern void os_free_irq_later(struct irq_fd *active_fds,
- int irq, void *dev_id);
-extern int os_get_pollfd(int i);
-extern void os_set_pollfd(int i, int fd);
+extern int os_waiting_for_events_epoll(void);
+extern void *os_epoll_get_data_pointer(int index);
+extern int os_epoll_triggered(int index, int events);
+extern int os_event_mask(int irq_type);
+extern int os_setup_epoll(void);
+extern int os_add_epoll_fd(int events, int fd, void *data);
+extern int os_mod_epoll_fd(int events, int fd, void *data);
+extern int os_del_epoll_fd(int fd);
extern void os_set_ioignore(void);
+extern void os_close_epoll_fd(void);
/* sigio.c */
extern int add_sigio_fd(int fd);
diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
index 23cb9350d47e..6b7f3827d6e4 100644
--- a/arch/um/kernel/irq.c
+++ b/arch/um/kernel/irq.c
@@ -1,4 +1,6 @@
/*
+ * Copyright (C) 2017 - Cambridge Greys Ltd
+ * Copyright (C) 2011 - 2014 Cisco Systems Inc
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
* Derived (i.e. mostly copied) from arch/i386/kernel/irq.c:
@@ -16,243 +18,362 @@
#include <as-layout.h>
#include <kern_util.h>
#include <os.h>
+#include <irq_user.h>
-/*
- * This list is accessed under irq_lock, except in sigio_handler,
- * where it is safe from being modified. IRQ handlers won't change it -
- * if an IRQ source has vanished, it will be freed by free_irqs just
- * before returning from sigio_handler. That will process a separate
- * list of irqs to free, with its own locking, coming back here to
- * remove list elements, taking the irq_lock to do so.
+
+/* When epoll triggers we do not know why it did so
+ * we can also have different IRQs for read and write.
+ * This is why we keep a small irq_fd array for each fd -
+ * one entry per IRQ type
*/
-static struct irq_fd *active_fds = NULL;
-static struct irq_fd **last_irq_ptr = &active_fds;
-extern void free_irqs(void);
+struct irq_entry {
+ struct irq_entry *next;
+ int fd;
+ struct irq_fd *irq_array[MAX_IRQ_TYPE + 1];
+};
+
+static struct irq_entry *active_fds;
+
+static DEFINE_SPINLOCK(irq_lock);
+
+static void irq_io_loop(struct irq_fd *irq, struct uml_pt_regs *regs)
+{
+/*
+ * irq->active guards against reentry
+ * irq->pending accumulates pending requests
+ * if pending is raised the irq_handler is re-run
+ * until pending is cleared
+ */
+ if (irq->active) {
+ irq->active = false;
+ do {
+ irq->pending = false;
+ do_IRQ(irq->irq, regs);
+ } while (irq->pending && (!irq->purge));
+ if (!irq->purge)
+ irq->active = true;
+ } else {
+ irq->pending = true;
+ }
+}
void sigio_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
{
- struct irq_fd *irq_fd;
- int n;
+ struct irq_entry *irq_entry;
+ struct irq_fd *irq;
+
+ int n, i, j;
while (1) {
- n = os_waiting_for_events(active_fds);
+ /* This is now lockless - epoll keeps back-referencesto the irqs
+ * which have trigger it so there is no need to walk the irq
+ * list and lock it every time. We avoid locking by turning off
+ * IO for a specific fd by executing os_del_epoll_fd(fd) before
+ * we do any changes to the actual data structures
+ */
+ n = os_waiting_for_events_epoll();
+
if (n <= 0) {
if (n == -EINTR)
continue;
- else break;
+ else
+ break;
}
- for (irq_fd = active_fds; irq_fd != NULL;
- irq_fd = irq_fd->next) {
- if (irq_fd->current_events != 0) {
- irq_fd->current_events = 0;
- do_IRQ(irq_fd->irq, regs);
+ for (i = 0; i < n ; i++) {
+ /* Epoll back reference is the entry with 3 irq_fd
+ * leaves - one for each irq type.
+ */
+ irq_entry = (struct irq_entry *)
+ os_epoll_get_data_pointer(i);
+ for (j = 0; j < MAX_IRQ_TYPE ; j++) {
+ irq = irq_entry->irq_array[j];
+ if (irq == NULL)
+ continue;
+ if (os_epoll_triggered(i, irq->events) > 0)
+ irq_io_loop(irq, regs);
+ if (irq->purge) {
+ irq_entry->irq_array[j] = NULL;
+ kfree(irq);
+ }
}
}
}
+}
+
+static int assign_epoll_events_to_irq(struct irq_entry *irq_entry)
+{
+ int i;
+ int events = 0;
+ struct irq_fd *irq;
- free_irqs();
+ for (i = 0; i < MAX_IRQ_TYPE ; i++) {
+ irq = irq_entry->irq_array[i];
+ if (irq != NULL)
+ events = irq->events | events;
+ }
+ if (events > 0) {
+ /* os_add_epoll will call os_mod_epoll if this already exists */
+ return os_add_epoll_fd(events, irq_entry->fd, irq_entry);
+ }
+ /* No events - delete */
+ return os_del_epoll_fd(irq_entry->fd);
}
-static DEFINE_SPINLOCK(irq_lock);
+
static int activate_fd(int irq, int fd, int type, void *dev_id)
{
- struct pollfd *tmp_pfd;
- struct irq_fd *new_fd, *irq_fd;
+ struct irq_fd *new_fd;
+ struct irq_entry *irq_entry;
+ int i, err, events;
unsigned long flags;
- int events, err, n;
err = os_set_fd_async(fd);
if (err < 0)
goto out;
- err = -ENOMEM;
- new_fd = kmalloc(sizeof(struct irq_fd), GFP_KERNEL);
- if (new_fd == NULL)
- goto out;
+ spin_lock_irqsave(&irq_lock, flags);
- if (type == IRQ_READ)
- events = UM_POLLIN | UM_POLLPRI;
- else events = UM_POLLOUT;
- *new_fd = ((struct irq_fd) { .next = NULL,
- .id = dev_id,
- .fd = fd,
- .type = type,
- .irq = irq,
- .events = events,
- .current_events = 0 } );
+ /* Check if we have an entry for this fd */
err = -EBUSY;
- spin_lock_irqsave(&irq_lock, flags);
- for (irq_fd = active_fds; irq_fd != NULL; irq_fd = irq_fd->next) {
- if ((irq_fd->fd == fd) && (irq_fd->type == type)) {
- printk(KERN_ERR "Registering fd %d twice\n", fd);
- printk(KERN_ERR "Irqs : %d, %d\n", irq_fd->irq, irq);
- printk(KERN_ERR "Ids : 0x%p, 0x%p\n", irq_fd->id,
- dev_id);
+ for (irq_entry = active_fds;
+ irq_entry != NULL; irq_entry = irq_entry->next) {
+ if (irq_entry->fd == fd)
+ break;
+ }
+
+ if (irq_entry == NULL) {
+ /* This needs to be atomic as it may be called from an
+ * IRQ context.
+ */
+ irq_entry = kmalloc(sizeof(struct irq_entry), GFP_ATOMIC);
+ if (irq_entry == NULL) {
+ printk(KERN_ERR
+ "Failed to allocate new IRQ entry\n");
goto out_unlock;
}
+ irq_entry->fd = fd;
+ for (i = 0; i < MAX_IRQ_TYPE; i++)
+ irq_entry->irq_array[i] = NULL;
+ irq_entry->next = active_fds;
+ active_fds = irq_entry;
}
- if (type == IRQ_WRITE)
- fd = -1;
-
- tmp_pfd = NULL;
- n = 0;
+ /* Check if we are trying to re-register an interrupt for a
+ * particular fd
+ */
- while (1) {
- n = os_create_pollfd(fd, events, tmp_pfd, n);
- if (n == 0)
- break;
+ if (irq_entry->irq_array[type] != NULL) {
+ printk(KERN_ERR
+ "Trying to reregister IRQ %d FD %d TYPE %d ID %p\n",
+ irq, fd, type, dev_id
+ );
+ goto out_unlock;
+ } else {
+ /* New entry for this fd */
+
+ err = -ENOMEM;
+ new_fd = kmalloc(sizeof(struct irq_fd), GFP_ATOMIC);
+ if (new_fd == NULL)
+ goto out_unlock;
- /*
- * n > 0
- * It means we couldn't put new pollfd to current pollfds
- * and tmp_fds is NULL or too small for new pollfds array.
- * Needed size is equal to n as minimum.
- *
- * Here we have to drop the lock in order to call
- * kmalloc, which might sleep.
- * If something else came in and changed the pollfds array
- * so we will not be able to put new pollfd struct to pollfds
- * then we free the buffer tmp_fds and try again.
+ events = os_event_mask(type);
+
+ *new_fd = ((struct irq_fd) {
+ .id = dev_id,
+ .irq = irq,
+ .type = type,
+ .events = events,
+ .active = true,
+ .pending = false,
+ .purge = false
+ });
+ /* Turn off any IO on this fd - allows us to
+ * avoid locking the IRQ loop
*/
- spin_unlock_irqrestore(&irq_lock, flags);
- kfree(tmp_pfd);
-
- tmp_pfd = kmalloc(n, GFP_KERNEL);
- if (tmp_pfd == NULL)
- goto out_kfree;
-
- spin_lock_irqsave(&irq_lock, flags);
+ os_del_epoll_fd(irq_entry->fd);
+ irq_entry->irq_array[type] = new_fd;
}
- *last_irq_ptr = new_fd;
- last_irq_ptr = &new_fd->next;
-
+ /* Turn back IO on with the correct (new) IO event mask */
+ assign_epoll_events_to_irq(irq_entry);
spin_unlock_irqrestore(&irq_lock, flags);
-
- /*
- * This calls activate_fd, so it has to be outside the critical
- * section.
- */
- maybe_sigio_broken(fd, (type == IRQ_READ));
+ maybe_sigio_broken(fd, (type != IRQ_NONE));
return 0;
-
- out_unlock:
+out_unlock:
spin_unlock_irqrestore(&irq_lock, flags);
- out_kfree:
- kfree(new_fd);
- out:
+out:
return err;
}
-static void free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg)
+/*
+ * Walk the IRQ list and dispose of any unused entries.
+ * Should be done under irq_lock.
+ */
+
+static void garbage_collect_irq_entries(void)
{
- unsigned long flags;
+ int i;
+ bool reap;
+ struct irq_entry *walk;
+ struct irq_entry *previous = NULL;
+ struct irq_entry *to_free;
- spin_lock_irqsave(&irq_lock, flags);
- os_free_irq_by_cb(test, arg, active_fds, &last_irq_ptr);
- spin_unlock_irqrestore(&irq_lock, flags);
+ if (active_fds == NULL)
+ return;
+ walk = active_fds;
+ while (walk != NULL) {
+ reap = true;
+ for (i = 0; i < MAX_IRQ_TYPE ; i++) {
+ if (walk->irq_array[i] != NULL) {
+ reap = false;
+ break;
+ }
+ }
+ if (reap) {
+ if (previous == NULL)
+ active_fds = walk->next;
+ else
+ previous->next = walk->next;
+ to_free = walk;
+ } else {
+ to_free = NULL;
+ }
+ walk = walk->next;
+ if (to_free != NULL)
+ kfree(to_free);
+ }
}
-struct irq_and_dev {
- int irq;
- void *dev;
-};
+/*
+ * Walk the IRQ list and get the descriptor for our FD
+ */
-static int same_irq_and_dev(struct irq_fd *irq, void *d)
+static struct irq_entry *get_irq_entry_by_fd(int fd)
{
- struct irq_and_dev *data = d;
+ struct irq_entry *walk = active_fds;
- return ((irq->irq == data->irq) && (irq->id == data->dev));
+ while (walk != NULL) {
+ if (walk->fd == fd)
+ return walk;
+ walk = walk->next;
+ }
+ return NULL;
}
-static void free_irq_by_irq_and_dev(unsigned int irq, void *dev)
-{
- struct irq_and_dev data = ((struct irq_and_dev) { .irq = irq,
- .dev = dev });
- free_irq_by_cb(same_irq_and_dev, &data);
-}
+/*
+ * Walk the IRQ list and dispose of an entry for a specific
+ * device, fd and number. Note - if sharing an IRQ for read
+ * and writefor the same FD it will be disposed in either case.
+ * If this behaviour is undesirable use different IRQ ids.
+ */
-static int same_fd(struct irq_fd *irq, void *fd)
-{
- return (irq->fd == *((int *)fd));
-}
+#define IGNORE_IRQ 1
+#define IGNORE_DEV (1<<1)
-void free_irq_by_fd(int fd)
+static void do_free_by_irq_and_dev(
+ struct irq_entry *irq_entry,
+ unsigned int irq,
+ void *dev,
+ int flags
+)
{
- free_irq_by_cb(same_fd, &fd);
+ int i;
+ struct irq_fd *to_free;
+
+ for (i = 0; i < MAX_IRQ_TYPE ; i++) {
+ if (irq_entry->irq_array[i] != NULL) {
+ if (
+ ((flags & IGNORE_IRQ) ||
+ (irq_entry->irq_array[i]->irq == irq)) &&
+ ((flags & IGNORE_DEV) ||
+ (irq_entry->irq_array[i]->id == dev))
+ ) {
+ /* Turn off any IO on this fd - allows us to
+ * avoid locking the IRQ loop
+ */
+ os_del_epoll_fd(irq_entry->fd);
+ to_free = irq_entry->irq_array[i];
+ irq_entry->irq_array[i] = NULL;
+ assign_epoll_events_to_irq(irq_entry);
+ if (to_free->active)
+ to_free->purge = true;
+ else
+ kfree(to_free);
+ }
+ }
+ }
}
-/* Must be called with irq_lock held */
-static struct irq_fd *find_irq_by_fd(int fd, int irqnum, int *index_out)
+void free_irq_by_fd(int fd)
{
- struct irq_fd *irq;
- int i = 0;
- int fdi;
+ struct irq_entry *to_free;
+ unsigned long flags;
- for (irq = active_fds; irq != NULL; irq = irq->next) {
- if ((irq->fd == fd) && (irq->irq == irqnum))
- break;
- i++;
- }
- if (irq == NULL) {
- printk(KERN_ERR "find_irq_by_fd doesn't have descriptor %d\n",
- fd);
- goto out;
- }
- fdi = os_get_pollfd(i);
- if ((fdi != -1) && (fdi != fd)) {
- printk(KERN_ERR "find_irq_by_fd - mismatch between active_fds "
- "and pollfds, fd %d vs %d, need %d\n", irq->fd,
- fdi, fd);
- irq = NULL;
- goto out;
+ spin_lock_irqsave(&irq_lock, flags);
+ to_free = get_irq_entry_by_fd(fd);
+ if (to_free != NULL) {
+ do_free_by_irq_and_dev(
+ to_free,
+ -1,
+ NULL,
+ IGNORE_IRQ | IGNORE_DEV
+ );
}
- *index_out = i;
- out:
- return irq;
+ garbage_collect_irq_entries();
+ spin_unlock_irqrestore(&irq_lock, flags);
}
+EXPORT_SYMBOL(free_irq_by_fd);
-void reactivate_fd(int fd, int irqnum)
+static void free_irq_by_irq_and_dev(unsigned int irq, void *dev)
{
- struct irq_fd *irq;
+ struct irq_entry *to_free;
unsigned long flags;
- int i;
spin_lock_irqsave(&irq_lock, flags);
- irq = find_irq_by_fd(fd, irqnum, &i);
- if (irq == NULL) {
- spin_unlock_irqrestore(&irq_lock, flags);
- return;
+ to_free = active_fds;
+ while (to_free != NULL) {
+ do_free_by_irq_and_dev(
+ to_free,
+ irq,
+ dev,
+ 0
+ );
+ to_free = to_free->next;
}
- os_set_pollfd(i, irq->fd);
+ garbage_collect_irq_entries();
spin_unlock_irqrestore(&irq_lock, flags);
+}
- add_sigio_fd(fd);
+
+void reactivate_fd(int fd, int irqnum)
+{
+ /** NOP - we do auto-EOI now **/
}
void deactivate_fd(int fd, int irqnum)
{
- struct irq_fd *irq;
+ struct irq_entry *to_free;
unsigned long flags;
- int i;
+ os_del_epoll_fd(fd);
spin_lock_irqsave(&irq_lock, flags);
- irq = find_irq_by_fd(fd, irqnum, &i);
- if (irq == NULL) {
- spin_unlock_irqrestore(&irq_lock, flags);
- return;
+ to_free = get_irq_entry_by_fd(fd);
+ if (to_free != NULL) {
+ do_free_by_irq_and_dev(
+ to_free,
+ irqnum,
+ NULL,
+ IGNORE_DEV
+ );
}
-
- os_set_pollfd(i, -1);
+ garbage_collect_irq_entries();
spin_unlock_irqrestore(&irq_lock, flags);
-
ignore_sigio_fd(fd);
}
EXPORT_SYMBOL(deactivate_fd);
@@ -265,17 +386,28 @@ EXPORT_SYMBOL(deactivate_fd);
*/
int deactivate_all_fds(void)
{
- struct irq_fd *irq;
- int err;
+ unsigned long flags;
+ struct irq_entry *to_free;
- for (irq = active_fds; irq != NULL; irq = irq->next) {
- err = os_clear_fd_async(irq->fd);
- if (err)
- return err;
- }
- /* If there is a signal already queued, after unblocking ignore it */
+ spin_lock_irqsave(&irq_lock, flags);
+ /* Stop IO. The IRQ loop has no lock so this is our
+ * only way of making sure we are safe to dispose
+ * of all IRQ handlers
+ */
os_set_ioignore();
-
+ to_free = active_fds;
+ while (to_free != NULL) {
+ do_free_by_irq_and_dev(
+ to_free,
+ -1,
+ NULL,
+ IGNORE_IRQ | IGNORE_DEV
+ );
+ to_free = to_free->next;
+ }
+ garbage_collect_irq_entries();
+ spin_unlock_irqrestore(&irq_lock, flags);
+ os_close_epoll_fd();
return 0;
}
@@ -353,8 +485,11 @@ void __init init_IRQ(void)
irq_set_chip_and_handler(TIMER_IRQ, &SIGVTALRM_irq_type, handle_edge_irq);
+
for (i = 1; i < NR_IRQS; i++)
irq_set_chip_and_handler(i, &normal_irq_type, handle_edge_irq);
+ /* Initialize EPOLL Loop */
+ os_setup_epoll();
}
/*
diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c
index 7f69d17de354..052de4c8acb2 100644
--- a/arch/um/kernel/time.c
+++ b/arch/um/kernel/time.c
@@ -121,12 +121,12 @@ static void __init um_timer_setup(void)
clockevents_register_device(&timer_clockevent);
}
-void read_persistent_clock(struct timespec *ts)
+void read_persistent_clock64(struct timespec64 *ts)
{
long long nsecs = os_persistent_clock_emulation();
- set_normalized_timespec(ts, nsecs / NSEC_PER_SEC,
- nsecs % NSEC_PER_SEC);
+ set_normalized_timespec64(ts, nsecs / NSEC_PER_SEC,
+ nsecs % NSEC_PER_SEC);
}
void __init time_init(void)
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
index 2db18cbbb0ea..c0197097c86e 100644
--- a/arch/um/os-Linux/file.c
+++ b/arch/um/os-Linux/file.c
@@ -12,6 +12,7 @@
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/stat.h>
+#include <sys/sysmacros.h>
#include <sys/un.h>
#include <sys/types.h>
#include <os.h>
diff --git a/arch/um/os-Linux/irq.c b/arch/um/os-Linux/irq.c
index b9afb74b79ad..365823010346 100644
--- a/arch/um/os-Linux/irq.c
+++ b/arch/um/os-Linux/irq.c
@@ -1,135 +1,147 @@
/*
+ * Copyright (C) 2017 - Cambridge Greys Ltd
+ * Copyright (C) 2011 - 2014 Cisco Systems Inc
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
#include <stdlib.h>
#include <errno.h>
-#include <poll.h>
+#include <sys/epoll.h>
#include <signal.h>
#include <string.h>
#include <irq_user.h>
#include <os.h>
#include <um_malloc.h>
+/* Epoll support */
+
+static int epollfd = -1;
+
+#define MAX_EPOLL_EVENTS 64
+
+static struct epoll_event epoll_events[MAX_EPOLL_EVENTS];
+
+/* Helper to return an Epoll data pointer from an epoll event structure.
+ * We need to keep this one on the userspace side to keep includes separate
+ */
+
+void *os_epoll_get_data_pointer(int index)
+{
+ return epoll_events[index].data.ptr;
+}
+
+/* Helper to compare events versus the events in the epoll structure.
+ * Same as above - needs to be on the userspace side
+ */
+
+
+int os_epoll_triggered(int index, int events)
+{
+ return epoll_events[index].events & events;
+}
+/* Helper to set the event mask.
+ * The event mask is opaque to the kernel side, because it does not have
+ * access to the right includes/defines for EPOLL constants.
+ */
+
+int os_event_mask(int irq_type)
+{
+ if (irq_type == IRQ_READ)
+ return EPOLLIN | EPOLLPRI;
+ if (irq_type == IRQ_WRITE)
+ return EPOLLOUT;
+ return 0;
+}
+
/*
- * Locked by irq_lock in arch/um/kernel/irq.c. Changed by os_create_pollfd
- * and os_free_irq_by_cb, which are called under irq_lock.
+ * Initial Epoll Setup
*/
-static struct pollfd *pollfds = NULL;
-static int pollfds_num = 0;
-static int pollfds_size = 0;
+int os_setup_epoll(void)
+{
+ epollfd = epoll_create(MAX_EPOLL_EVENTS);
+ return epollfd;
+}
-int os_waiting_for_events(struct irq_fd *active_fds)
+/*
+ * Helper to run the actual epoll_wait
+ */
+int os_waiting_for_events_epoll(void)
{
- struct irq_fd *irq_fd;
- int i, n, err;
+ int n, err;
- n = poll(pollfds, pollfds_num, 0);
+ n = epoll_wait(epollfd,
+ (struct epoll_event *) &epoll_events, MAX_EPOLL_EVENTS, 0);
if (n < 0) {
err = -errno;
if (errno != EINTR)
- printk(UM_KERN_ERR "os_waiting_for_events:"
- " poll returned %d, errno = %d\n", n, errno);
+ printk(
+ UM_KERN_ERR "os_waiting_for_events:"
+ " epoll returned %d, error = %s\n", n,
+ strerror(errno)
+ );
return err;
}
-
- if (n == 0)
- return 0;
-
- irq_fd = active_fds;
-
- for (i = 0; i < pollfds_num; i++) {
- if (pollfds[i].revents != 0) {
- irq_fd->current_events = pollfds[i].revents;
- pollfds[i].fd = -1;
- }
- irq_fd = irq_fd->next;
- }
return n;
}
-int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds)
-{
- if (pollfds_num == pollfds_size) {
- if (size_tmpfds <= pollfds_size * sizeof(pollfds[0])) {
- /* return min size needed for new pollfds area */
- return (pollfds_size + 1) * sizeof(pollfds[0]);
- }
-
- if (pollfds != NULL) {
- memcpy(tmp_pfd, pollfds,
- sizeof(pollfds[0]) * pollfds_size);
- /* remove old pollfds */
- kfree(pollfds);
- }
- pollfds = tmp_pfd;
- pollfds_size++;
- } else
- kfree(tmp_pfd); /* remove not used tmp_pfd */
-
- pollfds[pollfds_num] = ((struct pollfd) { .fd = fd,
- .events = events,
- .revents = 0 });
- pollfds_num++;
-
- return 0;
-}
-void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
- struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2)
+/*
+ * Helper to add a fd to epoll
+ */
+int os_add_epoll_fd(int events, int fd, void *data)
{
- struct irq_fd **prev;
- int i = 0;
-
- prev = &active_fds;
- while (*prev != NULL) {
- if ((*test)(*prev, arg)) {
- struct irq_fd *old_fd = *prev;
- if ((pollfds[i].fd != -1) &&
- (pollfds[i].fd != (*prev)->fd)) {
- printk(UM_KERN_ERR "os_free_irq_by_cb - "
- "mismatch between active_fds and "
- "pollfds, fd %d vs %d\n",
- (*prev)->fd, pollfds[i].fd);
- goto out;
- }
-
- pollfds_num--;
-
- /*
- * This moves the *whole* array after pollfds[i]
- * (though it doesn't spot as such)!
- */
- memmove(&pollfds[i], &pollfds[i + 1],
- (pollfds_num - i) * sizeof(pollfds[0]));
- if (*last_irq_ptr2 == &old_fd->next)
- *last_irq_ptr2 = prev;
-
- *prev = (*prev)->next;
- if (old_fd->type == IRQ_WRITE)
- ignore_sigio_fd(old_fd->fd);
- kfree(old_fd);
- continue;
- }
- prev = &(*prev)->next;
- i++;
- }
- out:
- return;
+ struct epoll_event event;
+ int result;
+
+ event.data.ptr = data;
+ event.events = events | EPOLLET;
+ result = epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &event);
+ if ((result) && (errno == EEXIST))
+ result = os_mod_epoll_fd(events, fd, data);
+ if (result)
+ printk("epollctl add err fd %d, %s\n", fd, strerror(errno));
+ return result;
}
-int os_get_pollfd(int i)
+/*
+ * Helper to mod the fd event mask and/or data backreference
+ */
+int os_mod_epoll_fd(int events, int fd, void *data)
{
- return pollfds[i].fd;
+ struct epoll_event event;
+ int result;
+
+ event.data.ptr = data;
+ event.events = events;
+ result = epoll_ctl(epollfd, EPOLL_CTL_MOD, fd, &event);
+ if (result)
+ printk(UM_KERN_ERR
+ "epollctl mod err fd %d, %s\n", fd, strerror(errno));
+ return result;
}
-void os_set_pollfd(int i, int fd)
+/*
+ * Helper to delete the epoll fd
+ */
+int os_del_epoll_fd(int fd)
{
- pollfds[i].fd = fd;
+ struct epoll_event event;
+ int result;
+ /* This is quiet as we use this as IO ON/OFF - so it is often
+ * invoked on a non-existent fd
+ */
+ result = epoll_ctl(epollfd, EPOLL_CTL_DEL, fd, &event);
+ return result;
}
void os_set_ioignore(void)
{
signal(SIGIO, SIG_IGN);
}
+
+void os_close_epoll_fd(void)
+{
+ /* Needed so we do not leak an fd when rebooting */
+ os_close_file(epollfd);
+}
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index a86d7cc2c2d8..bf0acb8aad8b 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c
@@ -16,6 +16,7 @@
#include <os.h>
#include <sysdep/mcontext.h>
#include <um_malloc.h>
+#include <sys/ucontext.h>
void (*sig_info[NSIG])(int, struct siginfo *, struct uml_pt_regs *) = {
[SIGTRAP] = relay_signal,
@@ -159,7 +160,7 @@ static void (*handlers[_NSIG])(int sig, struct siginfo *si, mcontext_t *mc) = {
static void hard_handler(int sig, siginfo_t *si, void *p)
{
- struct ucontext *uc = p;
+ ucontext_t *uc = p;
mcontext_t *mc = &uc->uc_mcontext;
unsigned long pending = 1UL << sig;