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authorAjit Khaparde <ajit.khaparde@emulex.com>2011-12-09 14:53:17 +0100
committerDavid S. Miller <davem@davemloft.net>2011-12-12 00:25:15 +0100
commit1ded132d4c3442aa3a619c94c245d7b5e0eb9731 (patch)
treec804509859f12b892686c5ce7c26bf0d0d9794cb /drivers
parentbe2net: update some counters to display via ethtool (diff)
downloadlinux-1ded132d4c3442aa3a619c94c245d7b5e0eb9731.tar.xz
linux-1ded132d4c3442aa3a619c94c245d7b5e0eb9731.zip
be2net: workaround to fix a bug in BE
disable Tx vlan offloading in certain cases. Signed-off-by: Ajit Khaparde <ajit.khaparde@emulex.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/emulex/benet/be_main.c46
1 files changed, 38 insertions, 8 deletions
diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index 73fe38928c2b..62f55145fa44 100644
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -552,11 +552,26 @@ static inline void wrb_fill(struct be_eth_wrb *wrb, u64 addr, int len)
wrb->frag_len = len & ETH_WRB_FRAG_LEN_MASK;
}
+static inline u16 be_get_tx_vlan_tag(struct be_adapter *adapter,
+ struct sk_buff *skb)
+{
+ u8 vlan_prio;
+ u16 vlan_tag;
+
+ vlan_tag = vlan_tx_tag_get(skb);
+ vlan_prio = (vlan_tag & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
+ /* If vlan priority provided by OS is NOT in available bmap */
+ if (!(adapter->vlan_prio_bmap & (1 << vlan_prio)))
+ vlan_tag = (vlan_tag & ~VLAN_PRIO_MASK) |
+ adapter->recommended_prio;
+
+ return vlan_tag;
+}
+
static void wrb_fill_hdr(struct be_adapter *adapter, struct be_eth_hdr_wrb *hdr,
struct sk_buff *skb, u32 wrb_cnt, u32 len)
{
- u8 vlan_prio = 0;
- u16 vlan_tag = 0;
+ u16 vlan_tag;
memset(hdr, 0, sizeof(*hdr));
@@ -587,12 +602,7 @@ static void wrb_fill_hdr(struct be_adapter *adapter, struct be_eth_hdr_wrb *hdr,
if (vlan_tx_tag_present(skb)) {
AMAP_SET_BITS(struct amap_eth_hdr_wrb, vlan, hdr, 1);
- vlan_tag = vlan_tx_tag_get(skb);
- vlan_prio = (vlan_tag & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
- /* If vlan priority provided by OS is NOT in available bmap */
- if (!(adapter->vlan_prio_bmap & (1 << vlan_prio)))
- vlan_tag = (vlan_tag & ~VLAN_PRIO_MASK) |
- adapter->recommended_prio;
+ vlan_tag = be_get_tx_vlan_tag(adapter, skb);
AMAP_SET_BITS(struct amap_eth_hdr_wrb, vlan_tag, hdr, vlan_tag);
}
@@ -695,6 +705,25 @@ static netdev_tx_t be_xmit(struct sk_buff *skb,
u32 start = txq->head;
bool dummy_wrb, stopped = false;
+ /* For vlan tagged pkts, BE
+ * 1) calculates checksum even when CSO is not requested
+ * 2) calculates checksum wrongly for padded pkt less than
+ * 60 bytes long.
+ * As a workaround disable TX vlan offloading in such cases.
+ */
+ if (unlikely(vlan_tx_tag_present(skb) &&
+ (skb->ip_summed != CHECKSUM_PARTIAL || skb->len <= 60))) {
+ skb = skb_share_check(skb, GFP_ATOMIC);
+ if (unlikely(!skb))
+ goto tx_drop;
+
+ skb = __vlan_put_tag(skb, be_get_tx_vlan_tag(adapter, skb));
+ if (unlikely(!skb))
+ goto tx_drop;
+
+ skb->vlan_tci = 0;
+ }
+
wrb_cnt = wrb_cnt_for_skb(adapter, skb, &dummy_wrb);
copied = make_tx_wrbs(adapter, txq, skb, wrb_cnt, dummy_wrb);
@@ -722,6 +751,7 @@ static netdev_tx_t be_xmit(struct sk_buff *skb,
txq->head = start;
dev_kfree_skb_any(skb);
}
+tx_drop:
return NETDEV_TX_OK;
}