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>

3 files changed, 21 insertions, 2 deletions

diff --git a/drivers/net/cxgb4/cxgb4_main.c b/drivers/net/cxgb4/cxgb4_main.c
index 5f582dba928f..1bad50041427 100644
--- a/drivers/net/cxgb4/cxgb4_main.c
+++ b/drivers/net/cxgb4/cxgb4_main.c
@@ -1711,6 +1711,18 @@ static int set_tso(struct net_device *dev, u32 value)
         return 0;
 }
 
+static int set_flags(struct net_device *dev, u32 flags)
+{
+        if (flags & ~ETH_FLAG_RXHASH)
+                return -EOPNOTSUPP;
+
+        if (flags & ETH_FLAG_RXHASH)
+                dev->features |= NETIF_F_RXHASH;
+        else
+                dev->features &= ~NETIF_F_RXHASH;
+        return 0;
+}
+
 static struct ethtool_ops cxgb_ethtool_ops = {
         .get_settings      = get_settings,
         .set_settings      = set_settings,
@@ -1741,6 +1753,7 @@ static struct ethtool_ops cxgb_ethtool_ops = {
         .get_wol           = get_wol,
         .set_wol           = set_wol,
         .set_tso           = set_tso,
+        .set_flags         = set_flags,
         .flash_device      = set_flash,
 };
 
@@ -3203,7 +3216,7 @@ static int __devinit init_one(struct pci_dev *pdev,
 
                 netdev->features |= NETIF_F_SG | NETIF_F_TSO | NETIF_F_TSO6;
                 netdev->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
-                netdev->features |= NETIF_F_GRO | highdma;
+                netdev->features |= NETIF_F_GRO | NETIF_F_RXHASH | highdma;
                 netdev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
                 netdev->vlan_features = netdev->features & VLAN_FEAT;
 
diff --git a/drivers/net/cxgb4/sge.c b/drivers/net/cxgb4/sge.c
index 65d91c4ec9f5..d1f8f225e45a 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++;
 
diff --git a/drivers/net/cxgb4/t4_msg.h b/drivers/net/cxgb4/t4_msg.h
index fdb117443144..7a981b81afaf 100644
--- a/drivers/net/cxgb4/t4_msg.h
+++ b/drivers/net/cxgb4/t4_msg.h
@@ -503,6 +503,7 @@ struct cpl_rx_data_ack {
 };
 
 struct cpl_rx_pkt {
+        struct rss_header rsshdr;
         u8 opcode;
 #if defined(__LITTLE_ENDIAN_BITFIELD)
         u8 iff:4;