netdev - [PATCH 2/2] bnx2x: expose HW RX VLAN stripping toggle

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Date:	Tue, 23 Aug 2011 18:15:39 +0200
From:	Michal Schmidt <mschmidt@...hat.com>
To:	netdev@...r.kernel.org
Cc:	Michal Schmidt <mschmidt@...hat.com>,
	Vladislav Zolotarov <vladz@...adcom.com>,
	Eilon Greenstein <eilong@...adcom.com>,
	Dmitry Kravkov <dmitry@...adcom.com>
Subject: [PATCH 2/2] bnx2x: expose HW RX VLAN stripping toggle

Allow disabling of HW RX VLAN stripping with ethtool.

Signed-off-by: Michal Schmidt <mschmidt@...hat.com>
CC: Vladislav Zolotarov <vladz@...adcom.com>
CC: Eilon Greenstein <eilong@...adcom.com>
CC: Dmitry Kravkov <dmitry@...adcom.com>
---

 drivers/net/ethernet/broadcom/bnx2x/bnx2x.h      |    1 +
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c  |   18 ++++++++++++++----
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c |   10 +++++-----
 3 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
index f127768..dd43634 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
@@ -1178,6 +1178,7 @@ struct bnx2x {
 #define NO_MCP_FLAG			(1 << 9)
 
 #define BP_NOMCP(bp)			(bp->flags & NO_MCP_FLAG)
+#define RX_VLAN_STRIP_FLAG		(1 << 10)
 #define MF_FUNC_DIS			(1 << 11)
 #define OWN_CNIC_IRQ			(1 << 12)
 #define NO_ISCSI_OOO_FLAG		(1 << 13)
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
index 93bff08..340bff9 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -385,6 +385,10 @@ static inline u16 bnx2x_set_lro_mss(struct bnx2x *bp, u16 parsing_flags,
 	else /* IPv4 */
 		hdrs_len += sizeof(struct iphdr);
 
+	/* VLAN header present and not stripped by HW */
+	if ((parsing_flags & PARSING_FLAGS_VLAN) &&
+	    !(bp->flags & RX_VLAN_STRIP_FLAG))
+		hdrs_len += VLAN_HLEN;
 
 	/* Check if there was a TCP timestamp, if there is it's will
 	 * always be 12 bytes length: nop nop kind length echo val.
@@ -412,7 +416,7 @@ static int bnx2x_fill_frag_skb(struct bnx2x *bp, struct bnx2x_fastpath *fp,
 	frag_size = le16_to_cpu(cqe->pkt_len) - len_on_bd;
 	pages = SGE_PAGE_ALIGN(frag_size) >> SGE_PAGE_SHIFT;
 
-	/* This is needed in order to enable forwarding support */
+	/* Doing LRO, let TCP know the receive MSS */
 	if (frag_size)
 		skb_shinfo(skb)->gso_size = bnx2x_set_lro_mss(bp,
 					tpa_info->parsing_flags, len_on_bd);
@@ -514,7 +518,8 @@ static void bnx2x_tpa_stop(struct bnx2x *bp, struct bnx2x_fastpath *fp,
 		skb->ip_summed = CHECKSUM_UNNECESSARY;
 
 		if (!bnx2x_fill_frag_skb(bp, fp, queue, skb, cqe, cqe_idx)) {
-			if (tpa_info->parsing_flags & PARSING_FLAGS_VLAN)
+			if ((tpa_info->parsing_flags & PARSING_FLAGS_VLAN) &&
+			    (bp->flags & RX_VLAN_STRIP_FLAG))
 				__vlan_hwaccel_put_tag(skb, tpa_info->vlan_tag);
 			napi_gro_receive(&fp->napi, skb);
 		} else {
@@ -757,8 +762,8 @@ reuse_rx:
 
 		skb_record_rx_queue(skb, fp->index);
 
-		if (le16_to_cpu(cqe_fp->pars_flags.flags) &
-		    PARSING_FLAGS_VLAN)
+		if ((le16_to_cpu(cqe_fp->pars_flags.flags) &
+		    PARSING_FLAGS_VLAN) && (bp->flags & RX_VLAN_STRIP_FLAG))
 			__vlan_hwaccel_put_tag(skb,
 					       le16_to_cpu(cqe_fp->vlan_tag));
 		napi_gro_receive(&fp->napi, skb);
@@ -3431,6 +3436,11 @@ int bnx2x_set_features(struct net_device *dev, u32 features)
 	else
 		flags &= ~TPA_ENABLE_FLAG;
 
+	if (features & NETIF_F_HW_VLAN_RX)
+		flags |= RX_VLAN_STRIP_FLAG;
+	else
+		flags &= ~RX_VLAN_STRIP_FLAG;
+
 	if (features & NETIF_F_LOOPBACK) {
 		if (bp->link_params.loopback_mode != LOOPBACK_BMAC) {
 			bp->link_params.loopback_mode = LOOPBACK_BMAC;
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
index 85dd294..e444e7d 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
@@ -2722,9 +2722,8 @@ static inline unsigned long bnx2x_get_q_flags(struct bnx2x *bp,
 		__set_bit(BNX2X_Q_FLG_MCAST, &flags);
 	}
 
-	/* Always set HW VLAN stripping */
-	__set_bit(BNX2X_Q_FLG_VLAN, &flags);
-
+	if (bp->flags & RX_VLAN_STRIP_FLAG)
+		__set_bit(BNX2X_Q_FLG_VLAN, &flags);
 
 	return flags | bnx2x_get_common_flags(bp, fp, true);
 }
@@ -10286,12 +10285,13 @@ static int __devinit bnx2x_init_dev(struct pci_dev *pdev,
 
 	dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 		NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_LRO |
-		NETIF_F_RXCSUM | NETIF_F_RXHASH | NETIF_F_HW_VLAN_TX;
+		NETIF_F_RXCSUM | NETIF_F_RXHASH |
+		NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
 
 	dev->vlan_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 		NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_HIGHDMA;
 
-	dev->features |= dev->hw_features | NETIF_F_HW_VLAN_RX;
+	dev->features |= dev->hw_features;
 	if (bp->flags & USING_DAC_FLAG)
 		dev->features |= NETIF_F_HIGHDMA;
 

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