cxgb4: set skb->rxhash

Implement the ->set_flags ethtool method to control NETIF_F_RXHASH and
set skb->rxhash to the HW calculated hash accordingly.

Follow Eric Dumazet's suggestion and use the hash value raw.

Signed-off-by: Dimitris Michailidis <dm@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/net/cxgb4/sge.c b/drivers/net/cxgb4/sge.c
index 65d91c4ec9f..d1f8f225e45 100644
--- a/drivers/net/cxgb4/sge.c
+++ b/drivers/net/cxgb4/sge.c
@@ -1524,6 +1524,8 @@ static void do_gro(struct sge_eth_rxq *rxq, const struct pkt_gl *gl,
         skb->truesize += skb->data_len;
         skb->ip_summed = CHECKSUM_UNNECESSARY;
         skb_record_rx_queue(skb, rxq->rspq.idx);
+        if (rxq->rspq.netdev->features & NETIF_F_RXHASH)
+                skb->rxhash = (__force u32)pkt->rsshdr.hash_val;
 
         if (unlikely(pkt->vlan_ex)) {
                 struct port_info *pi = netdev_priv(rxq->rspq.netdev);
@@ -1565,7 +1567,7 @@ int t4_ethrx_handler(struct sge_rspq *q, const __be64 *rsp,
         if (unlikely(*(u8 *)rsp == CPL_TRACE_PKT))
                 return handle_trace_pkt(q->adap, si);
 
-        pkt = (void *)&rsp[1];
+        pkt = (const struct cpl_rx_pkt *)rsp;
         csum_ok = pkt->csum_calc && !pkt->err_vec;
         if ((pkt->l2info & htonl(RXF_TCP)) &&
             (q->netdev->features & NETIF_F_GRO) && csum_ok && !pkt->ip_frag) {
@@ -1583,6 +1585,9 @@ int t4_ethrx_handler(struct sge_rspq *q, const __be64 *rsp,
         __skb_pull(skb, RX_PKT_PAD);      /* remove ethernet header padding */
         skb->protocol = eth_type_trans(skb, q->netdev);
         skb_record_rx_queue(skb, q->idx);
+        if (skb->dev->features & NETIF_F_RXHASH)
+                skb->rxhash = (__force u32)pkt->rsshdr.hash_val;
+
         pi = netdev_priv(skb->dev);
         rxq->stats.pkts++;