6.6-stable review patch. If anyone has any objections, please let me know.
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From: Nick Child nnac123@linux.ibm.com
[ Upstream commit de390657b5d6f7deb9d1d36aaf45f02ba51ec9dc ]
Previously, the TX header requirement for standard frames was ignored. This requirement is a bitstring sent from the VIOS which maps to the type of header information needed during TX. If no header information, is needed then send subcrq direct can be used (which can be more performant).
This bitstring was previously ignored for standard packets (AKA non LSO, non CSO) due to the belief that the bitstring was over-cautionary. It turns out that there are some configurations where the backing device does need header information for transmission of standard packets. If the information is not supplied then this causes continuous "Adapter error" transport events. Therefore, this bitstring should be respected and observed before considering the use of send subcrq direct.
Fixes: 74839f7a8268 ("ibmvnic: Introduce send sub-crq direct") Signed-off-by: Nick Child nnac123@linux.ibm.com Reviewed-by: Simon Horman horms@kernel.org Link: https://patch.msgid.link/20241001163200.1802522-2-nnac123@linux.ibm.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/ibm/ibmvnic.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index 4bcfdf6e6d3f2..05f410999a5a1 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -2490,9 +2490,11 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev) /* if we are going to send_subcrq_direct this then we need to * update the checksum before copying the data into ltb. Essentially * these packets force disable CSO so that we can guarantee that - * FW does not need header info and we can send direct. + * FW does not need header info and we can send direct. Also, vnic + * server must be able to xmit standard packets without header data */ - if (!skb_is_gso(skb) && !ind_bufp->index && !netdev_xmit_more()) { + if (*hdrs == 0 && !skb_is_gso(skb) && + !ind_bufp->index && !netdev_xmit_more()) { use_scrq_send_direct = true; if (skb->ip_summed == CHECKSUM_PARTIAL && skb_checksum_help(skb))