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Commit 2297a2da authored by Vladislav Zolotarov's avatar Vladislav Zolotarov Committed by David S. Miller
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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: default avatarVladislav Zolotarov <vladz@broadcom.com>
Signed-off-by: default avatarEilon Greenstein <eilong@broadcom.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4bc65dd8

drivers/net/bnx2x/bnx2x_cmn.c

+26 −16
Original line number Diff line number Diff line
@@ -1795,15 +1795,15 @@ static int bnx2x_pkt_req_lin(struct bnx2x *bp, struct sk_buff *skb, 
}

#endif



static inline void bnx2x_set_pbd_gso_e2(struct sk_buff *skb,

				     struct eth_tx_parse_bd_e2 *pbd,

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 */