diff options
| author | Dmitry Bogdanov <dmitry.bogdanov@aquantia.com> | 2019-08-30 12:08:38 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-08-31 19:07:11 -0700 |
| commit | be6cef69ba570ebb327eba1ef6438f7af49aaf86 (patch) | |
| tree | 0e3824a92a0457171c47d333897abd5ec9376d65 | |
| parent | 5c47e3ba6fe52465603cf9d816b3371e6881d649 (diff) | |
net: aquantia: fix out of memory condition on rx side
On embedded environments with hard memory limits it is a normal although
rare case when skb can't be allocated on rx part under high traffic.
In such OOM cases napi_complete_done() was not called.
So the napi object became in an invalid state like it is "scheduled".
Kernel do not re-schedules the poll of that napi object.
Consequently, kernel can not remove that object the system hangs on
`ifconfig down` waiting for a poll.
We are fixing this by gracefully closing napi poll routine with correct
invocation of napi_complete_done.
This was reproduced with artificially failing the allocation of skb to
simulate an "out of memory" error case and check that traffic does
not get stuck.
Fixes: 970a2e9864b0 ("net: ethernet: aquantia: Vector operations")
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: Dmitry Bogdanov <dmitry.bogdanov@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/aquantia/atlantic/aq_vec.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_vec.c b/drivers/net/ethernet/aquantia/atlantic/aq_vec.c index 715685aa48c3..28892b8acd0e 100644 --- a/drivers/net/ethernet/aquantia/atlantic/aq_vec.c +++ b/drivers/net/ethernet/aquantia/atlantic/aq_vec.c @@ -86,6 +86,7 @@ static int aq_vec_poll(struct napi_struct *napi, int budget) } } +err_exit: if (!was_tx_cleaned) work_done = budget; @@ -95,7 +96,7 @@ static int aq_vec_poll(struct napi_struct *napi, int budget) 1U << self->aq_ring_param.vec_idx); } } -err_exit: + return work_done; } |