This is a note to let you know that I've just added the patch titled
octeon_ep: update BQL sent bytes before ringing doorbell
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
octeon_ep-update-bql-sent-bytes-before-ringing-doorbell.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a0ca6b9dfef0b3cc83aa8bb485ed61a018f84982 Mon Sep 17 00:00:00 2001
From: Shinas Rasheed <srasheed@xxxxxxxxxxx>
Date: Tue, 17 Oct 2023 03:50:30 -0700
Subject: octeon_ep: update BQL sent bytes before ringing doorbell
From: Shinas Rasheed <srasheed@xxxxxxxxxxx>
commit a0ca6b9dfef0b3cc83aa8bb485ed61a018f84982 upstream.
Sometimes Tx is completed immediately after doorbell is updated, which
causes Tx completion routing to update completion bytes before the
same packet bytes are updated in sent bytes in transmit function, hence
hitting BUG_ON() in dql_completed(). To avoid this, update BQL
sent bytes before ringing doorbell.
Fixes: 37d79d059606 ("octeon_ep: add Tx/Rx processing and interrupt support")
Signed-off-by: Shinas Rasheed <srasheed@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231017105030.2310966-1-srasheed@xxxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/marvell/octeon_ep/octep_main.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
@@ -707,20 +707,19 @@ static netdev_tx_t octep_start_xmit(stru
hw_desc->dptr = tx_buffer->sglist_dma;
}
- /* Flush the hw descriptor before writing to doorbell */
- wmb();
-
- /* Ring Doorbell to notify the NIC there is a new packet */
- writel(1, iq->doorbell_reg);
+ netdev_tx_sent_queue(iq->netdev_q, skb->len);
+ skb_tx_timestamp(skb);
atomic_inc(&iq->instr_pending);
wi++;
if (wi == iq->max_count)
wi = 0;
iq->host_write_index = wi;
+ /* Flush the hw descriptor before writing to doorbell */
+ wmb();
- netdev_tx_sent_queue(iq->netdev_q, skb->len);
+ /* Ring Doorbell to notify the NIC there is a new packet */
+ writel(1, iq->doorbell_reg);
iq->stats.instr_posted++;
- skb_tx_timestamp(skb);
return NETDEV_TX_OK;
dma_map_sg_err:
Patches currently in stable-queue which might be from srasheed@xxxxxxxxxxx are
queue-6.1/octeon_ep-update-bql-sent-bytes-before-ringing-doorbell.patch
