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authorToke Høiland-Jørgensen <toke@redhat.com>2020-01-16 18:14:45 +0300
committerAlexei Starovoitov <ast@kernel.org>2020-01-17 07:03:34 +0300
commit1d233886dd904edbf239eeffe435c3308ae97625 (patch)
tree474882b8ddb9584fa8fcf23a0b7598b397c14dc8 /drivers/net/tun.c
parent75ccae62cb8d42a619323a85c577107b8b37d797 (diff)
downloadlinux-1d233886dd904edbf239eeffe435c3308ae97625.tar.xz
xdp: Use bulking for non-map XDP_REDIRECT and consolidate code paths
Since the bulk queue used by XDP_REDIRECT now lives in struct net_device, we can re-use the bulking for the non-map version of the bpf_redirect() helper. This is a simple matter of having xdp_do_redirect_slow() queue the frame on the bulk queue instead of sending it out with __bpf_tx_xdp(). Unfortunately we can't make the bpf_redirect() helper return an error if the ifindex doesn't exit (as bpf_redirect_map() does), because we don't have a reference to the network namespace of the ingress device at the time the helper is called. So we have to leave it as-is and keep the device lookup in xdp_do_redirect_slow(). Since this leaves less reason to have the non-map redirect code in a separate function, so we get rid of the xdp_do_redirect_slow() function entirely. This does lose us the tracepoint disambiguation, but fortunately the xdp_redirect and xdp_redirect_map tracepoints use the same tracepoint entry structures. This means both can contain a map index, so we can just amend the tracepoint definitions so we always emit the xdp_redirect(_err) tracepoints, but with the map ID only populated if a map is present. This means we retire the xdp_redirect_map(_err) tracepoints entirely, but keep the definitions around in case someone is still listening for them. With this change, the performance of the xdp_redirect sample program goes from 5Mpps to 8.4Mpps (a 68% increase). Since the flush functions are no longer map-specific, rename the flush() functions to drop _map from their names. One of the renamed functions is the xdp_do_flush_map() callback used in all the xdp-enabled drivers. To keep from having to update all drivers, use a #define to keep the old name working, and only update the virtual drivers in this patch. Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: John Fastabend <john.fastabend@gmail.com> Link: https://lore.kernel.org/bpf/157918768505.1458396.17518057312953572912.stgit@toke.dk
Diffstat (limited to 'drivers/net/tun.c')
-rw-r--r--drivers/net/tun.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 683d371e6e82..3a5a6c655dda 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1718,7 +1718,7 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
if (err < 0)
goto err_xdp;
if (err == XDP_REDIRECT)
- xdp_do_flush_map();
+ xdp_do_flush();
if (err != XDP_PASS)
goto out;
@@ -2549,7 +2549,7 @@ static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len)
}
if (flush)
- xdp_do_flush_map();
+ xdp_do_flush();
rcu_read_unlock();
local_bh_enable();