netdev - [net 05/10] net/mlx5e: RX, Fix page_pool allocation failure recovery for striding rq

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20231012195127.129585-6-saeed@kernel.org>
Date: Thu, 12 Oct 2023 12:51:22 -0700
From: Saeed Mahameed <saeed@...nel.org>
To: "David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>
Cc: Saeed Mahameed <saeedm@...dia.com>,
	netdev@...r.kernel.org,
	Tariq Toukan <tariqt@...dia.com>,
	Dragos Tatulea <dtatulea@...dia.com>,
	Chris Mason <clm@...com>
Subject: [net 05/10] net/mlx5e: RX, Fix page_pool allocation failure recovery for striding rq

From: Dragos Tatulea <dtatulea@...dia.com>

When a page allocation fails during refill in mlx5e_post_rx_mpwqes, the
page will be released again on the next refill call. This triggers the
page_pool negative page fragment count warning below:

 [ 2436.447717] WARNING: CPU: 1 PID: 2419 at include/net/page_pool/helpers.h:130 mlx5e_page_release_fragmented.isra.0+0x42/0x50 [mlx5_core]
 ...
 [ 2436.447895] RIP: 0010:mlx5e_page_release_fragmented.isra.0+0x42/0x50 [mlx5_core]
 [ 2436.447991] Call Trace:
 [ 2436.447975]  mlx5e_post_rx_mpwqes+0x1d5/0xcf0 [mlx5_core]
 [ 2436.447994]  <IRQ>
 [ 2436.447996]  ? __warn+0x7d/0x120
 [ 2436.448009]  ? mlx5e_handle_rx_cqe_mpwrq+0x109/0x1d0 [mlx5_core]
 [ 2436.448002]  ? mlx5e_page_release_fragmented.isra.0+0x42/0x50 [mlx5_core]
 [ 2436.448044]  ? mlx5e_poll_rx_cq+0x87/0x6e0 [mlx5_core]
 [ 2436.448061]  ? report_bug+0x155/0x180
 [ 2436.448065]  ? handle_bug+0x36/0x70
 [ 2436.448067]  ? exc_invalid_op+0x13/0x60
 [ 2436.448070]  ? asm_exc_invalid_op+0x16/0x20
 [ 2436.448079]  mlx5e_napi_poll+0x122/0x6b0 [mlx5_core]
 [ 2436.448077]  ? mlx5e_page_release_fragmented.isra.0+0x42/0x50 [mlx5_core]
 [ 2436.448113]  ? generic_exec_single+0x35/0x100
 [ 2436.448117]  __napi_poll+0x25/0x1a0
 [ 2436.448120]  net_rx_action+0x28a/0x300
 [ 2436.448122]  __do_softirq+0xcd/0x279
 [ 2436.448126]  irq_exit_rcu+0x6a/0x90
 [ 2436.448128]  sysvec_apic_timer_interrupt+0x6e/0x90
 [ 2436.448130]  </IRQ>

This patch fixes the striding rq case by setting the skip flag on all
the wqe pages that were expected to have new pages allocated.

Fixes: 4c2a13236807 ("net/mlx5e: RX, Defer page release in striding rq for better recycling")
Tested-by: Chris Mason <clm@...com>
Reported-by: Chris Mason <clm@...com>
Closes: https://lore.kernel.org/netdev/117FF31A-7BE0-4050-B2BB-E41F224FF72F@meta.com
Signed-off-by: Dragos Tatulea <dtatulea@...dia.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index 3fd11b0761e0..7988b3a9598c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -816,6 +816,8 @@ static int mlx5e_alloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix)
 		mlx5e_page_release_fragmented(rq, frag_page);
 	}
 
+	bitmap_fill(wi->skip_release_bitmap, rq->mpwqe.pages_per_wqe);
+
 err:
 	rq->stats->buff_alloc_err++;
 
-- 
2.41.0