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authorDavid Howells <dhowells@redhat.com>2018-10-04 11:10:51 +0100
committerDavid Howells <dhowells@redhat.com>2018-10-08 15:45:18 +0100
commit5271953cad31b97dea80f848c16e96ad66401199 (patch)
treed7ebc9c86a13557a6802fab23b7b1a25a708d6b5 /net/rxrpc/local_object.c
parent2cfa2271604bb26e75b828d38f357ed084464795 (diff)
downloadlinux-stericsson-5271953cad31b97dea80f848c16e96ad66401199.tar.gz
rxrpc: Use the UDP encap_rcv hook
Use the UDP encap_rcv hook to cut the bit out of the rxrpc packet reception in which a packet is placed onto the UDP receive queue and then immediately removed again by rxrpc. Going via the queue in this manner seems like it should be unnecessary. This does, however, require the invention of a value to place in encap_type as that's one of the conditions to switch packets out to the encap_rcv hook. Possibly the value doesn't actually matter for anything other than sockopts on the UDP socket, which aren't accessible outside of rxrpc anyway. This seems to cut a bit of time out of the time elapsed between each sk_buff being timestamped and turning up in rxrpc (the final number in the following trace excerpts). I measured this by making the rxrpc_rx_packet trace point print the time elapsed between the skb being timestamped and the current time (in ns), e.g.: ... 424.278721: rxrpc_rx_packet: ... ACK 25026 So doing a 512MiB DIO read from my test server, with an unmodified kernel: N min max sum mean stddev 27605 2626 7581 7.83992e+07 2840.04 181.029 and with the patch applied: N min max sum mean stddev 27547 1895 12165 6.77461e+07 2459.29 255.02 Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc/local_object.c')
-rw-r--r--net/rxrpc/local_object.c27
1 files changed, 22 insertions, 5 deletions
diff --git a/net/rxrpc/local_object.c b/net/rxrpc/local_object.c
index 30862f44c9f1..cad0691c2bb4 100644
--- a/net/rxrpc/local_object.c
+++ b/net/rxrpc/local_object.c
@@ -19,6 +19,7 @@
#include <linux/ip.h>
#include <linux/hashtable.h>
#include <net/sock.h>
+#include <net/udp.h>
#include <net/af_rxrpc.h>
#include "ar-internal.h"
@@ -108,7 +109,7 @@ static struct rxrpc_local *rxrpc_alloc_local(struct rxrpc_net *rxnet,
*/
static int rxrpc_open_socket(struct rxrpc_local *local, struct net *net)
{
- struct sock *sock;
+ struct sock *usk;
int ret, opt;
_enter("%p{%d,%d}",
@@ -123,10 +124,26 @@ static int rxrpc_open_socket(struct rxrpc_local *local, struct net *net)
}
/* set the socket up */
- sock = local->socket->sk;
- sock->sk_user_data = local;
- sock->sk_data_ready = rxrpc_data_ready;
- sock->sk_error_report = rxrpc_error_report;
+ usk = local->socket->sk;
+ inet_sk(usk)->mc_loop = 0;
+
+ /* Enable CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion */
+ inet_inc_convert_csum(usk);
+
+ rcu_assign_sk_user_data(usk, local);
+
+ udp_sk(usk)->encap_type = UDP_ENCAP_RXRPC;
+ udp_sk(usk)->encap_rcv = rxrpc_input_packet;
+ udp_sk(usk)->encap_destroy = NULL;
+ udp_sk(usk)->gro_receive = NULL;
+ udp_sk(usk)->gro_complete = NULL;
+
+ udp_encap_enable();
+#if IS_ENABLED(CONFIG_IPV6)
+ if (local->srx.transport.family == AF_INET6)
+ udpv6_encap_enable();
+#endif
+ usk->sk_error_report = rxrpc_error_report;
/* if a local address was supplied then bind it */
if (local->srx.transport_len > sizeof(sa_family_t)) {