Currently, vmxnet3 uses GRO callback only if LRO is disabled. However, on smartNic based setups where UPT is supported, LRO can be enabled from guest VM but UPT devicve does not support LRO as of now. In such cases, there can be performance degradation as GRO is not being done.
This patch fixes this issue by calling GRO API when UPT is enabled. We use updateRxProd to determine if UPT mode is active or not.
To clarify few things discussed over the thread: The patch is not neglecting any feature bits nor disabling GRO. It uses GRO callback when UPT is active as LRO is not available in UPT. GRO callback cannot be used as default for all cases as it degrades performance for non-UPT cases or for cases when LRO is already done in ESXi.
Cc: stable@vger.kernel.org Fixes: 6f91f4ba046e ("vmxnet3: add support for capability registers") Signed-off-by: Ronak Doshi doshir@vmware.com Reviewed-by: Simon Horman simon.horman@corigine.com -- v1->v2: split if check on multiple lines --- drivers/net/vmxnet3/vmxnet3_drv.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c index 682987040ea8..da488cbb0542 100644 --- a/drivers/net/vmxnet3/vmxnet3_drv.c +++ b/drivers/net/vmxnet3/vmxnet3_drv.c @@ -1688,7 +1688,9 @@ vmxnet3_rq_rx_complete(struct vmxnet3_rx_queue *rq, if (unlikely(rcd->ts)) __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), rcd->tci);
- if (adapter->netdev->features & NETIF_F_LRO) + /* Use GRO callback if UPT is enabled */ + if ((adapter->netdev->features & NETIF_F_LRO) && + !rq->shared->updateRxProd) netif_receive_skb(skb); else napi_gro_receive(&rq->napi, skb);