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bnxt_en: Prevent TX timeout with a very small TX ring

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If xmit_more condition is true, the driver may set the
TX_BD_FLAGS_NO_CMPL flag.  If after this packet, the TX ring can no
longer hold a packet with maximum fragments, we will stop the TX
queue.  When this happens, we must clear the TX_BD_FLAGS_NO_CMPL flag
on the last packet or there will be no completion and cause TX
timeout.

Fixes: c1056a59ae ("bnxt_en: Optimize xmit_more TX path")
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
Reviewed-by: Hongguang Gao <hongguang.gao@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20231212005122.2401-5-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Michael Chan 2023-12-11 16:51:13 -08:00 committed by Jakub Kicinski
parent 18fe0a383c
commit f12f551b5b
1 changed files with 4 additions and 1 deletions
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5
drivers/net/ethernet/broadcom/bnxt/bnxt.c
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@ -666,8 +666,11 @@ static netdev_tx_t bnxt_start_xmit(struct sk_buff *skb, struct net_device *dev)
tx_done:
if (unlikely(bnxt_tx_avail(bp, txr) <= MAX_SKB_FRAGS + 1)) {
if (netdev_xmit_more() && !tx_buf->is_push)
if (netdev_xmit_more() && !tx_buf->is_push) {
txbd0->tx_bd_len_flags_type &=
cpu_to_le32(~TX_BD_FLAGS_NO_CMPL);
bnxt_txr_db_kick(bp, txr, prod);
}
netif_txq_try_stop(txq, bnxt_tx_avail(bp, txr),
bp->tx_wake_thresh);