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authorBjörn Töpel <bjorn.topel@intel.com>2018-06-04 14:05:55 +0200
committerDaniel Borkmann <daniel@iogearbox.net>2018-06-05 15:46:55 +0200
commit173d3adb6f437037f216270955886ca9878187a5 (patch)
tree9eb770a9b2a2b74d1a19dc7ac3d3ec417c337057 /net/xdp
parent02b55e5657c3a569fc681ba851e464cfa6b90d4f (diff)
downloadlinux-stericsson-173d3adb6f437037f216270955886ca9878187a5.tar.gz
xsk: add zero-copy support for Rx
Extend the xsk_rcv to support the new MEM_TYPE_ZERO_COPY memory, and wireup ndo_bpf call in bind. Signed-off-by: Björn Töpel <bjorn.topel@intel.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'net/xdp')
-rw-r--r--net/xdp/xdp_umem.c77
-rw-r--r--net/xdp/xdp_umem.h3
-rw-r--r--net/xdp/xsk.c96
3 files changed, 156 insertions, 20 deletions
diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c
index aca826011f6c..f729d79b8d91 100644
--- a/net/xdp/xdp_umem.c
+++ b/net/xdp/xdp_umem.c
@@ -17,6 +17,81 @@
#define XDP_UMEM_MIN_CHUNK_SIZE 2048
+int xdp_umem_assign_dev(struct xdp_umem *umem, struct net_device *dev,
+ u32 queue_id, u16 flags)
+{
+ bool force_zc, force_copy;
+ struct netdev_bpf bpf;
+ int err;
+
+ force_zc = flags & XDP_ZEROCOPY;
+ force_copy = flags & XDP_COPY;
+
+ if (force_zc && force_copy)
+ return -EINVAL;
+
+ if (force_copy)
+ return 0;
+
+ dev_hold(dev);
+
+ if (dev->netdev_ops->ndo_bpf) {
+ bpf.command = XDP_QUERY_XSK_UMEM;
+
+ rtnl_lock();
+ err = dev->netdev_ops->ndo_bpf(dev, &bpf);
+ rtnl_unlock();
+
+ if (err) {
+ dev_put(dev);
+ return force_zc ? -ENOTSUPP : 0;
+ }
+
+ bpf.command = XDP_SETUP_XSK_UMEM;
+ bpf.xsk.umem = umem;
+ bpf.xsk.queue_id = queue_id;
+
+ rtnl_lock();
+ err = dev->netdev_ops->ndo_bpf(dev, &bpf);
+ rtnl_unlock();
+
+ if (err) {
+ dev_put(dev);
+ return force_zc ? err : 0; /* fail or fallback */
+ }
+
+ umem->dev = dev;
+ umem->queue_id = queue_id;
+ umem->zc = true;
+ return 0;
+ }
+
+ dev_put(dev);
+ return force_zc ? -ENOTSUPP : 0; /* fail or fallback */
+}
+
+void xdp_umem_clear_dev(struct xdp_umem *umem)
+{
+ struct netdev_bpf bpf;
+ int err;
+
+ if (umem->dev) {
+ bpf.command = XDP_SETUP_XSK_UMEM;
+ bpf.xsk.umem = NULL;
+ bpf.xsk.queue_id = umem->queue_id;
+
+ rtnl_lock();
+ err = umem->dev->netdev_ops->ndo_bpf(umem->dev, &bpf);
+ rtnl_unlock();
+
+ if (err)
+ WARN(1, "failed to disable umem!\n");
+
+ dev_put(umem->dev);
+ umem->dev = NULL;
+ }
+}
+
static void xdp_umem_unpin_pages(struct xdp_umem *umem)
{
unsigned int i;
@@ -43,6 +118,8 @@ static void xdp_umem_release(struct xdp_umem *umem)
struct task_struct *task;
struct mm_struct *mm;
+ xdp_umem_clear_dev(umem);
+
if (umem->fq) {
xskq_destroy(umem->fq);
umem->fq = NULL;
diff --git a/net/xdp/xdp_umem.h b/net/xdp/xdp_umem.h
index 40e8fa4a92af..674508a32a4d 100644
--- a/net/xdp/xdp_umem.h
+++ b/net/xdp/xdp_umem.h
@@ -13,6 +13,9 @@ static inline char *xdp_umem_get_data(struct xdp_umem *umem, u64 addr)
return umem->pages[addr >> PAGE_SHIFT].addr + (addr & (PAGE_SIZE - 1));
}
+int xdp_umem_assign_dev(struct xdp_umem *umem, struct net_device *dev,
+ u32 queue_id, u16 flags);
+void xdp_umem_clear_dev(struct xdp_umem *umem);
bool xdp_umem_validate_queues(struct xdp_umem *umem);
void xdp_get_umem(struct xdp_umem *umem);
void xdp_put_umem(struct xdp_umem *umem);
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 4688c750df1d..ab64bd8260ea 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -36,19 +36,28 @@ static struct xdp_sock *xdp_sk(struct sock *sk)
bool xsk_is_setup_for_bpf_map(struct xdp_sock *xs)
{
- return !!xs->rx;
+ return READ_ONCE(xs->rx) && READ_ONCE(xs->umem) &&
+ READ_ONCE(xs->umem->fq);
}
-static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
+u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr)
+{
+ return xskq_peek_addr(umem->fq, addr);
+}
+EXPORT_SYMBOL(xsk_umem_peek_addr);
+
+void xsk_umem_discard_addr(struct xdp_umem *umem)
+{
+ xskq_discard_addr(umem->fq);
+}
+EXPORT_SYMBOL(xsk_umem_discard_addr);
+
+static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len)
{
- u32 len = xdp->data_end - xdp->data;
void *buffer;
u64 addr;
int err;
- if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index)
- return -EINVAL;
-
if (!xskq_peek_addr(xs->umem->fq, &addr) ||
len > xs->umem->chunk_size_nohr) {
xs->rx_dropped++;
@@ -60,25 +69,41 @@ static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
buffer = xdp_umem_get_data(xs->umem, addr);
memcpy(buffer, xdp->data, len);
err = xskq_produce_batch_desc(xs->rx, addr, len);
- if (!err)
+ if (!err) {
xskq_discard_addr(xs->umem->fq);
- else
- xs->rx_dropped++;
+ xdp_return_buff(xdp);
+ return 0;
+ }
+ xs->rx_dropped++;
return err;
}
-int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
+static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len)
{
- int err;
+ int err = xskq_produce_batch_desc(xs->rx, (u64)xdp->handle, len);
- err = __xsk_rcv(xs, xdp);
- if (likely(!err))
+ if (err) {
xdp_return_buff(xdp);
+ xs->rx_dropped++;
+ }
return err;
}
+int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
+{
+ u32 len;
+
+ if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index)
+ return -EINVAL;
+
+ len = xdp->data_end - xdp->data;
+
+ return (xdp->rxq->mem.type == MEM_TYPE_ZERO_COPY) ?
+ __xsk_rcv_zc(xs, xdp, len) : __xsk_rcv(xs, xdp, len);
+}
+
void xsk_flush(struct xdp_sock *xs)
{
xskq_produce_flush_desc(xs->rx);
@@ -87,12 +112,29 @@ void xsk_flush(struct xdp_sock *xs)
int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
{
+ u32 len = xdp->data_end - xdp->data;
+ void *buffer;
+ u64 addr;
int err;
- err = __xsk_rcv(xs, xdp);
- if (!err)
+ if (!xskq_peek_addr(xs->umem->fq, &addr) ||
+ len > xs->umem->chunk_size_nohr) {
+ xs->rx_dropped++;
+ return -ENOSPC;
+ }
+
+ addr += xs->umem->headroom;
+
+ buffer = xdp_umem_get_data(xs->umem, addr);
+ memcpy(buffer, xdp->data, len);
+ err = xskq_produce_batch_desc(xs->rx, addr, len);
+ if (!err) {
+ xskq_discard_addr(xs->umem->fq);
xsk_flush(xs);
+ return 0;
+ }
+ xs->rx_dropped++;
return err;
}
@@ -291,6 +333,7 @@ static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
struct sock *sk = sock->sk;
struct xdp_sock *xs = xdp_sk(sk);
struct net_device *dev;
+ u32 flags, qid;
int err = 0;
if (addr_len < sizeof(struct sockaddr_xdp))
@@ -315,16 +358,26 @@ static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
goto out_unlock;
}
- if ((xs->rx && sxdp->sxdp_queue_id >= dev->real_num_rx_queues) ||
- (xs->tx && sxdp->sxdp_queue_id >= dev->real_num_tx_queues)) {
+ qid = sxdp->sxdp_queue_id;
+
+ if ((xs->rx && qid >= dev->real_num_rx_queues) ||
+ (xs->tx && qid >= dev->real_num_tx_queues)) {
err = -EINVAL;
goto out_unlock;
}
- if (sxdp->sxdp_flags & XDP_SHARED_UMEM) {
+ flags = sxdp->sxdp_flags;
+
+ if (flags & XDP_SHARED_UMEM) {
struct xdp_sock *umem_xs;
struct socket *sock;
+ if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY)) {
+ /* Cannot specify flags for shared sockets. */
+ err = -EINVAL;
+ goto out_unlock;
+ }
+
if (xs->umem) {
/* We have already our own. */
err = -EINVAL;
@@ -343,8 +396,7 @@ static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
err = -EBADF;
sockfd_put(sock);
goto out_unlock;
- } else if (umem_xs->dev != dev ||
- umem_xs->queue_id != sxdp->sxdp_queue_id) {
+ } else if (umem_xs->dev != dev || umem_xs->queue_id != qid) {
err = -EINVAL;
sockfd_put(sock);
goto out_unlock;
@@ -360,6 +412,10 @@ static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
/* This xsk has its own umem. */
xskq_set_umem(xs->umem->fq, &xs->umem->props);
xskq_set_umem(xs->umem->cq, &xs->umem->props);
+
+ err = xdp_umem_assign_dev(xs->umem, dev, qid, flags);
+ if (err)
+ goto out_unlock;
}
xs->dev = dev;