netdev - [PATCH net-next 7/8] vmxnet3: use ext1 field to indicate encapsulated packet

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Date:   Fri, 27 May 2022 18:17:57 -0700
From:   Ronak Doshi <doshir@...are.com>
To:     <netdev@...r.kernel.org>
CC:     Ronak Doshi <doshir@...are.com>,
        VMware PV-Drivers Reviewers <pv-drivers@...are.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: [PATCH net-next 7/8] vmxnet3: use ext1 field to indicate encapsulated packet

Till vmxnet3 version 6, om field of transmit descriptor was used
to indicate encapsulated offload packet and msscof was used to
indirectly indicate TSO/CSO. From version 7 and later, ext1 field
will be used to indicate whether packet is encapsulated or not and
om fields will continue to indicate if the packet is TSO or CSO.

Signed-off-by: Ronak Doshi <doshir@...are.com>
Acked-by: Guolin Yang <gyang@...are.com>
---
 drivers/net/vmxnet3/vmxnet3_defs.h | 14 ++++++++------
 drivers/net/vmxnet3/vmxnet3_drv.c  | 18 +++++++++++++++---
 2 files changed, 23 insertions(+), 9 deletions(-)

diff --git a/drivers/net/vmxnet3/vmxnet3_defs.h b/drivers/net/vmxnet3/vmxnet3_defs.h
index cb9dc72f2b3d..41d6767283a6 100644
--- a/drivers/net/vmxnet3/vmxnet3_defs.h
+++ b/drivers/net/vmxnet3/vmxnet3_defs.h
@@ -148,17 +148,17 @@ struct Vmxnet3_TxDesc {
 
 #ifdef __BIG_ENDIAN_BITFIELD
 	u32 msscof:14;  /* MSS, checksum offset, flags */
-	u32 ext1:1;
+	u32 ext1:1;     /* set to 1 to indicate inner csum/tso, vmxnet3 v7 */
 	u32 dtype:1;    /* descriptor type */
-	u32 oco:1;
+	u32 oco:1;      /* Outer csum offload */
 	u32 gen:1;      /* generation bit */
 	u32 len:14;
 #else
 	u32 len:14;
 	u32 gen:1;      /* generation bit */
-	u32 oco:1;
+	u32 oco:1;      /* Outer csum offload */
 	u32 dtype:1;    /* descriptor type */
-	u32 ext1:1;
+	u32 ext1:1;     /* set to 1 to indicate inner csum/tso, vmxnet3 v7 */
 	u32 msscof:14;  /* MSS, checksum offset, flags */
 #endif  /* __BIG_ENDIAN_BITFIELD */
 
@@ -262,11 +262,13 @@ struct Vmxnet3_RxCompDesc {
 	u32		rqID:10;      /* rx queue/ring ID */
 	u32		sop:1;        /* Start of Packet */
 	u32		eop:1;        /* End of Packet */
-	u32		ext1:2;
+	u32		ext1:2;       /* bit 0: indicating v4/v6/.. is for inner header */
+				      /* bit 1: indicating rssType is based on inner header */
 	u32		rxdIdx:12;    /* Index of the RxDesc */
 #else
 	u32		rxdIdx:12;    /* Index of the RxDesc */
-	u32		ext1:2;
+	u32		ext1:2;       /* bit 0: indicating v4/v6/.. is for inner header */
+				      /* bit 1: indicating rssType is based on inner header */
 	u32		eop:1;        /* End of Packet */
 	u32		sop:1;        /* Start of Packet */
 	u32		rqID:10;      /* rx queue/ring ID */
diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c
index 6e013ae0b5ea..aa96441ea86c 100644
--- a/drivers/net/vmxnet3/vmxnet3_drv.c
+++ b/drivers/net/vmxnet3/vmxnet3_drv.c
@@ -1161,7 +1161,12 @@ vmxnet3_tq_xmit(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
 	if (ctx.mss) {
 		if (VMXNET3_VERSION_GE_4(adapter) && skb->encapsulation) {
 			gdesc->txd.hlen = ctx.l4_offset + ctx.l4_hdr_size;
-			gdesc->txd.om = VMXNET3_OM_ENCAP;
+			if (VMXNET3_VERSION_GE_7(adapter)) {
+				gdesc->txd.om = VMXNET3_OM_TSO;
+				gdesc->txd.ext1 = 1;
+			} else {
+				gdesc->txd.om = VMXNET3_OM_ENCAP;
+			}
 			gdesc->txd.msscof = ctx.mss;
 
 			if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM)
@@ -1178,8 +1183,15 @@ vmxnet3_tq_xmit(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
 			    skb->encapsulation) {
 				gdesc->txd.hlen = ctx.l4_offset +
 						  ctx.l4_hdr_size;
-				gdesc->txd.om = VMXNET3_OM_ENCAP;
-				gdesc->txd.msscof = 0;		/* Reserved */
+				if (VMXNET3_VERSION_GE_7(adapter)) {
+					gdesc->txd.om = VMXNET3_OM_CSUM;
+					gdesc->txd.msscof = ctx.l4_offset +
+							    skb->csum_offset;
+					gdesc->txd.ext1 = 1;
+				} else {
+					gdesc->txd.om = VMXNET3_OM_ENCAP;
+					gdesc->txd.msscof = 0;		/* Reserved */
+				}
 			} else {
 				gdesc->txd.hlen = ctx.l4_offset;
 				gdesc->txd.om = VMXNET3_OM_CSUM;
-- 
2.11.0