-----Original Message----- From: Greg Kroah-Hartman gregkh@linuxfoundation.org Sent: Monday, October 16, 2023 10:47 AM To: Haiyang Zhang haiyangz@microsoft.com Cc: stable@vger.kernel.org; patches@lists.linux.dev; Simon Horman horms@kernel.org; Shradha Gupta shradhagupta@linux.microsoft.com; Paolo Abeni pabeni@redhat.com; Sasha Levin sashal@kernel.org Subject: Re: [PATCH 6.1 001/131] net: mana: Fix TX CQE error handling
On Mon, Oct 16, 2023 at 02:35:15PM +0000, Haiyang Zhang wrote:
-----Original Message----- From: Greg Kroah-Hartman gregkh@linuxfoundation.org Sent: Monday, October 16, 2023 4:40 AM To: stable@vger.kernel.org Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org; patches@lists.linux.dev; Haiyang Zhang haiyangz@microsoft.com;
Simon
Horman horms@kernel.org; Shradha Gupta shradhagupta@linux.microsoft.com; Paolo Abeni
Sasha Levin sashal@kernel.org Subject: [PATCH 6.1 001/131] net: mana: Fix TX CQE error handling
6.1-stable review patch. If anyone has any objections, please let me know.
From: Haiyang Zhang haiyangz@microsoft.com
[ Upstream commit b2b000069a4c307b09548dc2243f31f3ca0eac9c ]
For an unknown TX CQE error type (probably from a newer hardware), still free the SKB, update the queue tail, etc., otherwise the accounting will be wrong.
Also, TX errors can be triggered by injecting corrupted packets, so replace the WARN_ONCE to ratelimited error logging.
Cc: stable@vger.kernel.org Fixes: ca9c54d2d6a5 ("net: mana: Add a driver for Microsoft Azure
Network
Adapter (MANA)") Signed-off-by: Haiyang Zhang haiyangz@microsoft.com Reviewed-by: Simon Horman horms@kernel.org Reviewed-by: Shradha Gupta shradhagupta@linux.microsoft.com Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org
drivers/net/ethernet/microsoft/mana/mana_en.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c index 4f4204432aaa3..23ce26b8295dc 100644 --- a/drivers/net/ethernet/microsoft/mana/mana_en.c +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c @@ -1003,16 +1003,20 @@ static void mana_poll_tx_cq(struct mana_cq *cq) case CQE_TX_VPORT_IDX_OUT_OF_RANGE: case CQE_TX_VPORT_DISABLED: case CQE_TX_VLAN_TAGGING_VIOLATION:
WARN_ONCE(1, "TX: CQE error %d: ignored.\n",cqe_oob->cqe_hdr.cqe_type);
if (net_ratelimit())netdev_err(ndev, "TX: CQE error %d\n",cqe_oob->cqe_hdr.cqe_type);break;default:
/* If the CQE type is unexpected, log an error, assert,* and go through the error path.
/* If the CQE type is unknown, log an error,* and still free the SKB, update tail, etc. */
WARN_ONCE(1, "TX: Unexpected CQE type %d: HWBUG?\n",
cqe_oob->cqe_hdr.cqe_type);
if (net_ratelimit())netdev_err(ndev, "TX: unknown CQEtype %d\n",
cqe_oob->cqe_hdr.cqe_type);return;This should be changed to "break", because we should "still free the SKB,
update
the queue tail, etc., otherwise the accounting will be wrong":
Is that an issue in Linus's tree, or is this unique to the stable backport?
It's just a stable backporting issue.
Linus's tree is fine: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
Thanks, - Haiyang