[PATCH net-next-2.6] be2net: Workaround to fix a bug in Rx Completion processing.

[PATCH net-next-2.6] be2net: Workaround to fix a bug in Rx Completion processing.

[Ajit Khaparde]

vtp bit in RX completion descriptor could be wrongly set in
some skews of BladEngine.  Ignore this  bit if vtm is not set.
This patch is against the net-next-2.6 tree.

Signed-off-by: Ajit Khaparde <ajitk@serverengines.com>
---
 drivers/net/benet/be.h      |    1 +
 drivers/net/benet/be_cmds.c |    3 ++-
 drivers/net/benet/be_cmds.h |    3 ++-
 drivers/net/benet/be_main.c |   23 +++++++++++++++++++----
 4 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/drivers/net/benet/be.h b/drivers/net/benet/be.h
index 13b72ce..7503b92 100644
--- a/drivers/net/benet/be.h
+++ b/drivers/net/benet/be.h
@@ -258,6 +258,7 @@ struct be_adapter {
 	bool link_up;
 	u32 port_num;
 	bool promiscuous;
+	u32 cap;
 };
 
 extern const struct ethtool_ops be_ethtool_ops;
diff --git a/drivers/net/benet/be_cmds.c b/drivers/net/benet/be_cmds.c
index 1db0924..513e47b 100644
--- a/drivers/net/benet/be_cmds.c
+++ b/drivers/net/benet/be_cmds.c
@@ -995,7 +995,7 @@ int be_cmd_get_flow_control(struct be_adapter *adapter, u32 *tx_fc, u32 *rx_fc)
 	return status;
 }
 
-int be_cmd_query_fw_cfg(struct be_adapter *adapter, u32 *port_num)
+int be_cmd_query_fw_cfg(struct be_adapter *adapter, u32 *port_num, u32 *cap)
 {
 	struct be_mcc_wrb *wrb = wrb_from_mbox(&adapter->mbox_mem);
 	struct be_cmd_req_query_fw_cfg *req = embedded_payload(wrb);
@@ -1014,6 +1014,7 @@ int be_cmd_query_fw_cfg(struct be_adapter *adapter, u32 *port_num)
 	if (!status) {
 		struct be_cmd_resp_query_fw_cfg *resp = embedded_payload(wrb);
 		*port_num = le32_to_cpu(resp->phys_port);
+		*cap = le32_to_cpu(resp->function_cap);
 	}
 
 	spin_unlock(&adapter->mbox_lock);
diff --git a/drivers/net/benet/be_cmds.h b/drivers/net/benet/be_cmds.h
index fd7028e..f4fd74e 100644
--- a/drivers/net/benet/be_cmds.h
+++ b/drivers/net/benet/be_cmds.h
@@ -759,7 +759,8 @@ extern int be_cmd_set_flow_control(struct be_adapter *adapter,
 			u32 tx_fc, u32 rx_fc);
 extern int be_cmd_get_flow_control(struct be_adapter *adapter,
 			u32 *tx_fc, u32 *rx_fc);
-extern int be_cmd_query_fw_cfg(struct be_adapter *adapter, u32 *port_num);
+extern int be_cmd_query_fw_cfg(struct be_adapter *adapter,
+			u32 *port_num, u32 *cap);
 extern int be_cmd_reset_function(struct be_adapter *adapter);
 extern void be_process_mcc(struct be_adapter *adapter);
 extern int be_cmd_write_flashrom(struct be_adapter *adapter,
diff --git a/drivers/net/benet/be_main.c b/drivers/net/benet/be_main.c
index ce11bba..44d2e6a 100644
--- a/drivers/net/benet/be_main.c
+++ b/drivers/net/benet/be_main.c
@@ -747,9 +747,16 @@ static void be_rx_compl_process(struct be_adapter *adapter,
 			struct be_eth_rx_compl *rxcp)
 {
 	struct sk_buff *skb;
-	u32 vtp, vid;
+	u32 vlanf, vid;
+	u8 vtm;
 
-	vtp = AMAP_GET_BITS(struct amap_eth_rx_compl, vtp, rxcp);
+	vlanf = AMAP_GET_BITS(struct amap_eth_rx_compl, vtp, rxcp);
+	vtm = AMAP_GET_BITS(struct amap_eth_rx_compl, vtm, rxcp);
+
+	/* vlanf could be wrongly set in some cards.
+	 * ignore if vtm is not set */
+	if ((adapter->cap == 0x400) && !vtm)
+		vlanf = 0;
 
 	skb = netdev_alloc_skb(adapter->netdev, BE_HDR_LEN + NET_IP_ALIGN);
 	if (!skb) {
@@ -772,7 +779,7 @@ static void be_rx_compl_process(struct be_adapter *adapter,
 	skb->protocol = eth_type_trans(skb, adapter->netdev);
 	skb->dev = adapter->netdev;
 
-	if (vtp) {
+	if (vlanf) {
 		if (!adapter->vlan_grp || adapter->num_vlans == 0) {
 			kfree_skb(skb);
 			return;
@@ -797,11 +804,18 @@ static void be_rx_compl_process_gro(struct be_adapter *adapter,
 	struct be_eq_obj *eq_obj =  &adapter->rx_eq;
 	u32 num_rcvd, pkt_size, remaining, vlanf, curr_frag_len;
 	u16 i, rxq_idx = 0, vid, j;
+	u8 vtm;
 
 	num_rcvd = AMAP_GET_BITS(struct amap_eth_rx_compl, numfrags, rxcp);
 	pkt_size = AMAP_GET_BITS(struct amap_eth_rx_compl, pktsize, rxcp);
 	vlanf = AMAP_GET_BITS(struct amap_eth_rx_compl, vtp, rxcp);
 	rxq_idx = AMAP_GET_BITS(struct amap_eth_rx_compl, fragndx, rxcp);
+	vtm = AMAP_GET_BITS(struct amap_eth_rx_compl, vtm, rxcp);
+
+	/* vlanf could be wrongly set in some cards.
+	 * ignore if vtm is not set */
+	if ((adapter->cap == 0x400) && !vtm)
+		vlanf = 0;
 
 	skb = napi_get_frags(&eq_obj->napi);
 	if (!skb) {
@@ -2045,7 +2059,8 @@ static int be_hw_up(struct be_adapter *adapter)
 	if (status)
 		return status;
 
-	status = be_cmd_query_fw_cfg(adapter, &adapter->port_num);
+	status = be_cmd_query_fw_cfg(adapter,
+				&adapter->port_num, &adapter->cap);
 	return status;
 }
 
-- 
1.6.0.4

Re: [PATCH net-next-2.6] be2net: Workaround to fix a bug in Rx Completion processing.

[David Miller]

From: Ajit Khaparde <ajitk@serverengines.com>
Date: Wed, 30 Sep 2009 14:37:06 +0530

> vtp bit in RX completion descriptor could be wrongly set in
> some skews of BladEngine.  Ignore this  bit if vtm is not set.
> This patch is against the net-next-2.6 tree.
> 
> Signed-off-by: Ajit Khaparde <ajitk@serverengines.com>

This doesn't apply.

Until I start taking new feature patches, net-next-2.6 is just
going to be a stale GIT tree based upon Linus's tree at some
point in time long ago.

net-2.6 is far in front of that, and actually since this is a bug
fix you really should be sending me this patch against that.