bnx2x: LSO code was broken on BE platforms

Make the LSO code work on BE platforms: parsing_data field of
a parsing BD (PBD) for 57712 was improperly composed which made FW read wrong
values for TCP header's length and offset and, as a result, the corresponding
PCI device was performing bad DMA reads triggering EEH.

Signed-off-by: Vladislav Zolotarov <vladz@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/bnx2x/bnx2x_cmn.c b/drivers/net/bnx2x/bnx2x_cmn.c
index a4555edbe9ce3ec03cd5e2eb68704dc5abcbd43d..236c00c3f568a599e56fd8c00ce2f377cbefdc59 100644 (file)
--- a/drivers/net/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/bnx2x/bnx2x_cmn.c
@@ -1795,15 +1795,15 @@ exit_lbl:
 }
 #endif
 
-static inline void bnx2x_set_pbd_gso_e2(struct sk_buff *skb,
-                                    struct eth_tx_parse_bd_e2 *pbd,
-                                    u32 xmit_type)
+static inline void bnx2x_set_pbd_gso_e2(struct sk_buff *skb, u32 *parsing_data,
+                                       u32 xmit_type)
 {
-       pbd->parsing_data |= cpu_to_le16(skb_shinfo(skb)->gso_size) <<
-               ETH_TX_PARSE_BD_E2_LSO_MSS_SHIFT;
+       *parsing_data |= (skb_shinfo(skb)->gso_size <<
+                             ETH_TX_PARSE_BD_E2_LSO_MSS_SHIFT) &
+                             ETH_TX_PARSE_BD_E2_LSO_MSS;
        if ((xmit_type & XMIT_GSO_V6) &&
            (ipv6_hdr(skb)->nexthdr == NEXTHDR_IPV6))
-               pbd->parsing_data |= ETH_TX_PARSE_BD_E2_IPV6_WITH_EXT_HDR;
+               *parsing_data |= ETH_TX_PARSE_BD_E2_IPV6_WITH_EXT_HDR;
 }
 
 /**
@@ -1848,15 +1848,15 @@ static inline void bnx2x_set_pbd_gso(struct sk_buff *skb,
  * @return header len
  */
 static inline  u8 bnx2x_set_pbd_csum_e2(struct bnx2x *bp, struct sk_buff *skb,
-       struct eth_tx_parse_bd_e2 *pbd,
-       u32 xmit_type)
+       u32 *parsing_data, u32 xmit_type)
 {
-       pbd->parsing_data |= cpu_to_le16(tcp_hdrlen(skb)/4) <<
-               ETH_TX_PARSE_BD_E2_TCP_HDR_LENGTH_DW_SHIFT;
+       *parsing_data |= ((tcp_hdrlen(skb)/4) <<
+               ETH_TX_PARSE_BD_E2_TCP_HDR_LENGTH_DW_SHIFT) &
+               ETH_TX_PARSE_BD_E2_TCP_HDR_LENGTH_DW;
 
-       pbd->parsing_data |= cpu_to_le16(((unsigned char *)tcp_hdr(skb) -
-                                         skb->data) / 2) <<
-               ETH_TX_PARSE_BD_E2_TCP_HDR_START_OFFSET_W_SHIFT;
+       *parsing_data |= ((((u8 *)tcp_hdr(skb) - skb->data) / 2) <<
+               ETH_TX_PARSE_BD_E2_TCP_HDR_START_OFFSET_W_SHIFT) &
+               ETH_TX_PARSE_BD_E2_TCP_HDR_START_OFFSET_W;
 
        return skb_transport_header(skb) + tcp_hdrlen(skb) - skb->data;
 }
@@ -1925,6 +1925,7 @@ netdev_tx_t bnx2x_start_xmit(struct sk_buff *skb, struct net_device *dev)
        struct eth_tx_bd *tx_data_bd, *total_pkt_bd = NULL;
        struct eth_tx_parse_bd_e1x *pbd_e1x = NULL;
        struct eth_tx_parse_bd_e2 *pbd_e2 = NULL;
+       u32 pbd_e2_parsing_data = 0;
        u16 pkt_prod, bd_prod;
        int nbd, fp_index;
        dma_addr_t mapping;
@@ -2046,8 +2047,9 @@ netdev_tx_t bnx2x_start_xmit(struct sk_buff *skb, struct net_device *dev)
                memset(pbd_e2, 0, sizeof(struct eth_tx_parse_bd_e2));
                /* Set PBD in checksum offload case */
                if (xmit_type & XMIT_CSUM)
-                       hlen = bnx2x_set_pbd_csum_e2(bp,
-                                                    skb, pbd_e2, xmit_type);
+                       hlen = bnx2x_set_pbd_csum_e2(bp, skb,
+                                                    &pbd_e2_parsing_data,
+                                                    xmit_type);
        } else {
                pbd_e1x = &fp->tx_desc_ring[bd_prod].parse_bd_e1x;
                memset(pbd_e1x, 0, sizeof(struct eth_tx_parse_bd_e1x));
@@ -2089,10 +2091,18 @@ netdev_tx_t bnx2x_start_xmit(struct sk_buff *skb, struct net_device *dev)
                        bd_prod = bnx2x_tx_split(bp, fp, tx_buf, &tx_start_bd,
                                                 hlen, bd_prod, ++nbd);
                if (CHIP_IS_E2(bp))
-                       bnx2x_set_pbd_gso_e2(skb, pbd_e2, xmit_type);
+                       bnx2x_set_pbd_gso_e2(skb, &pbd_e2_parsing_data,
+                                            xmit_type);
                else
                        bnx2x_set_pbd_gso(skb, pbd_e1x, xmit_type);
        }
+
+       /* Set the PBD's parsing_data field if not zero
+        * (for the chips newer than 57711).
+        */
+       if (pbd_e2_parsing_data)
+               pbd_e2->parsing_data = cpu_to_le32(pbd_e2_parsing_data);
+
        tx_data_bd = (struct eth_tx_bd *)tx_start_bd;
 
        /* Handle fragmented skb */