bnx2x: Fix GSO for 57710/57711 chips

Starting with commit 91226790bbe2dbfbba48dd79d49f2b38ef10eb97
`bnx2x: use FW 7.8.17', the bnx2x driver no longer requests the FW to perform
IP checksums for IPv4 packets.

This behaviour needs to be revised for 57710/57711 chips -
when using GSO, if the driver will not set the IP checksum flag then packets
will be transmitted by the chip without a valid IP checksum, resulting in
a drop of all such packets on the receiver-side.

Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
index b8fbe26..be59ec4 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -3313,6 +3313,7 @@ static void bnx2x_set_pbd_gso_e2(struct sk_buff *skb, u32 *parsing_data,
  */
 static void bnx2x_set_pbd_gso(struct sk_buff *skb,
                              struct eth_tx_parse_bd_e1x *pbd,
+                             struct eth_tx_start_bd *tx_start_bd,
                              u32 xmit_type)
 {
        pbd->lso_mss = cpu_to_le16(skb_shinfo(skb)->gso_size);
@@ -3326,11 +3327,14 @@ static void bnx2x_set_pbd_gso(struct sk_buff *skb,
                                                   ip_hdr(skb)->daddr,
                                                   0, IPPROTO_TCP, 0));
 
-       } else
+               /* GSO on 57710/57711 needs FW to calculate IP checksum */
+               tx_start_bd->bd_flags.as_bitfield |= ETH_TX_BD_FLAGS_IP_CSUM;
+       } else {
                pbd->tcp_pseudo_csum =
                        bswab16(~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
                                                 &ipv6_hdr(skb)->daddr,
                                                 0, IPPROTO_TCP, 0));
+       }
 
        pbd->global_data |=
                cpu_to_le16(ETH_TX_PARSE_BD_E1X_PSEUDO_CS_WITHOUT_LEN);
@@ -3814,7 +3818,8 @@ netdev_tx_t bnx2x_start_xmit(struct sk_buff *skb, struct net_device *dev)
                        bnx2x_set_pbd_gso_e2(skb, &pbd_e2_parsing_data,
                                             xmit_type);
                else
-                       bnx2x_set_pbd_gso(skb, pbd_e1x, xmit_type);
+                       bnx2x_set_pbd_gso(skb, pbd_e1x, tx_start_bd,
+                                         xmit_type);
        }
 
        /* Set the PBD's parsing_data field if not zero