diff options
| author | Maciej Fijalkowski | 2022-07-07 15:08:42 +0200 |
|---|---|---|
| committer | Daniel Borkmann | 2022-07-14 22:45:34 +0200 |
| commit | ca2e1a627035002cd33d9667431e80bad90c25fa (patch) | |
| tree | 22171aeca209537d0d58c7d85789e713e2565eef /net/xdp | |
| parent | 33f32e5072b6cc84d1b130a3ad485849bcec907a (diff) | |
xsk: Mark napi_id on sendmsg()
When application runs in busy poll mode and does not receive a single
packet but only sends them, it is currently impossible to get into
napi_busy_loop() as napi_id is only marked on Rx side in xsk_rcv_check().
In there, napi_id is being taken from xdp_rxq_info carried by xdp_buff.
From Tx perspective, we do not have access to it. What we have handy is
the xsk pool.
Xsk pool works on a pool of internal xdp_buff wrappers called xdp_buff_xsk.
AF_XDP ZC enabled drivers call xp_set_rxq_info() so each of xdp_buff_xsk
has a valid pointer to xdp_rxq_info of underlying queue. Therefore, on Tx
side, napi_id can be pulled from xs->pool->heads[0].xdp.rxq->napi_id. Hide
this pointer chase under helper function, xsk_pool_get_napi_id().
Do this only for sockets working in ZC mode as otherwise rxq pointers would
not be initialized.
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20220707130842.49408-1-maciej.fijalkowski@intel.com
Diffstat (limited to 'net/xdp')
| -rw-r--r-- | net/xdp/xsk.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c index 09002387987e..5b4ce6ba1bc7 100644 --- a/net/xdp/xsk.c +++ b/net/xdp/xsk.c @@ -639,8 +639,11 @@ static int __xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len if (unlikely(need_wait)) return -EOPNOTSUPP; - if (sk_can_busy_loop(sk)) + if (sk_can_busy_loop(sk)) { + if (xs->zc) + __sk_mark_napi_id_once(sk, xsk_pool_get_napi_id(xs->pool)); sk_busy_loop(sk, 1); /* only support non-blocking sockets */ + } if (xs->zc && xsk_no_wakeup(sk)) return 0; |