cxgb4: enable inner header checksum calculation

set cntrl bits to indicate whether inner header checksum
needs to be calculated whenever the packet is an encapsulated
packet and enable supported encap features.

Fixes: d0a1299c6bf7 ("cxgb4: add support for vxlan segmentation offload")
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 70 insertions, 21 deletions

diff --git a/drivers/net/ethernet/chelsio/cxgb4/sge.c b/drivers/net/ethernet/chelsio/cxgb4/sge.c
index 1a28df137e1f..0f87e973a158 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/sge.c
@@ -1072,12 +1072,27 @@ static void *inline_tx_skb_header(const struct sk_buff *skb,
 static u64 hwcsum(enum chip_type chip, const struct sk_buff *skb)
 {
 	int csum_type;
-	const struct iphdr *iph = ip_hdr(skb);
+	bool inner_hdr_csum = false;
+	u16 proto, ver;
 
-	if (iph->version == 4) {
-		if (iph->protocol == IPPROTO_TCP)
+	if (skb->encapsulation &&
+	    (CHELSIO_CHIP_VERSION(chip) > CHELSIO_T5))
+		inner_hdr_csum = true;
+
+	if (inner_hdr_csum) {
+		ver = inner_ip_hdr(skb)->version;
+		proto = (ver == 4) ? inner_ip_hdr(skb)->protocol :
+			inner_ipv6_hdr(skb)->nexthdr;
+	} else {
+		ver = ip_hdr(skb)->version;
+		proto = (ver == 4) ? ip_hdr(skb)->protocol :
+			ipv6_hdr(skb)->nexthdr;
+	}
+
+	if (ver == 4) {
+		if (proto == IPPROTO_TCP)
 			csum_type = TX_CSUM_TCPIP;
-		else if (iph->protocol == IPPROTO_UDP)
+		else if (proto == IPPROTO_UDP)
 			csum_type = TX_CSUM_UDPIP;
 		else {
 nocsum:			/*
@@ -1090,19 +1105,29 @@ nocsum:			/*
 		/*
 		 * this doesn't work with extension headers
 		 */
-		const struct ipv6hdr *ip6h = (const struct ipv6hdr *)iph;
-
-		if (ip6h->nexthdr == IPPROTO_TCP)
+		if (proto == IPPROTO_TCP)
 			csum_type = TX_CSUM_TCPIP6;
-		else if (ip6h->nexthdr == IPPROTO_UDP)
+		else if (proto == IPPROTO_UDP)
 			csum_type = TX_CSUM_UDPIP6;
 		else
 			goto nocsum;
 	}
 
 	if (likely(csum_type >= TX_CSUM_TCPIP)) {
-		u64 hdr_len = TXPKT_IPHDR_LEN_V(skb_network_header_len(skb));
-		int eth_hdr_len = skb_network_offset(skb) - ETH_HLEN;
+		int eth_hdr_len, l4_len;
+		u64 hdr_len;
+
+		if (inner_hdr_csum) {
+			/* This allows checksum offload for all encapsulated
+			 * packets like GRE etc..
+			 */
+			l4_len = skb_inner_network_header_len(skb);
+			eth_hdr_len = skb_inner_network_offset(skb) - ETH_HLEN;
+		} else {
+			l4_len = skb_network_header_len(skb);
+			eth_hdr_len = skb_network_offset(skb) - ETH_HLEN;
+		}
+		hdr_len = TXPKT_IPHDR_LEN_V(l4_len);
 
 		if (CHELSIO_CHIP_VERSION(chip) <= CHELSIO_T5)
 			hdr_len |= TXPKT_ETHHDR_LEN_V(eth_hdr_len);
@@ -1273,7 +1298,7 @@ static inline void t6_fill_tnl_lso(struct sk_buff *skb,
 netdev_tx_t t4_eth_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	u32 wr_mid, ctrl0, op;
-	u64 cntrl, *end;
+	u64 cntrl, *end, *sgl;
 	int qidx, credits;
 	unsigned int flits, ndesc;
 	struct adapter *adap;
@@ -1443,6 +1468,19 @@ out_free:	dev_kfree_skb_any(skb);
 				 TX_CSUM_TCPIP6 : TX_CSUM_TCPIP) |
 				 TXPKT_IPHDR_LEN_V(l3hdr_len);
 		}
+		sgl = (u64 *)(cpl + 1); /* sgl start here */
+		if (unlikely((u8 *)sgl >= (u8 *)q->q.stat)) {
+			/* If current position is already at the end of the
+			 * txq, reset the current to point to start of the queue
+			 * and update the end ptr as well.
+			 */
+			if (sgl == (u64 *)q->q.stat) {
+				int left = (u8 *)end - (u8 *)q->q.stat;
+
+				end = (void *)q->q.desc + left;
+				sgl = (void *)q->q.desc;
+			}
+		}
 		q->tso++;
 		q->tx_cso += ssi->gso_segs;
 	} else {
@@ -1454,6 +1492,7 @@ out_free:	dev_kfree_skb_any(skb);
 		wr->op_immdlen = htonl(FW_WR_OP_V(op) |
 				       FW_WR_IMMDLEN_V(len));
 		cpl = (void *)(wr + 1);
+		sgl = (u64 *)(cpl + 1);
 		if (skb->ip_summed == CHECKSUM_PARTIAL) {
 			cntrl = hwcsum(adap->params.chip, skb) |
 				TXPKT_IPCSUM_DIS_F;
@@ -1487,13 +1526,12 @@ out_free:	dev_kfree_skb_any(skb);
 	cpl->ctrl1 = cpu_to_be64(cntrl);
 
 	if (immediate) {
-		cxgb4_inline_tx_skb(skb, &q->q, cpl + 1);
+		cxgb4_inline_tx_skb(skb, &q->q, sgl);
 		dev_consume_skb_any(skb);
 	} else {
 		int last_desc;
 
-		cxgb4_write_sgl(skb, &q->q, (struct ulptx_sgl *)(cpl + 1),
-				end, 0, addr);
+		cxgb4_write_sgl(skb, &q->q, (void *)sgl, end, 0, addr);
 		skb_orphan(skb);
 
 		last_desc = q->q.pidx + ndesc - 1;
@@ -2259,7 +2297,7 @@ static void cxgb4_sgetim_to_hwtstamp(struct adapter *adap,
 }
 
 static void do_gro(struct sge_eth_rxq *rxq, const struct pkt_gl *gl,
-		   const struct cpl_rx_pkt *pkt)
+		   const struct cpl_rx_pkt *pkt, unsigned long tnl_hdr_len)
 {
 	struct adapter *adapter = rxq->rspq.adap;
 	struct sge *s = &adapter->sge;
@@ -2275,6 +2313,8 @@ static void do_gro(struct sge_eth_rxq *rxq, const struct pkt_gl *gl,
 	}
 
 	copy_frags(skb, gl, s->pktshift);
+	if (tnl_hdr_len)
+		skb->csum_level = 1;
 	skb->len = gl->tot_len - s->pktshift;
 	skb->data_len = skb->len;
 	skb->truesize += skb->data_len;
@@ -2406,7 +2446,7 @@ int t4_ethrx_handler(struct sge_rspq *q, const __be64 *rsp,
 	struct sge *s = &q->adap->sge;
 	int cpl_trace_pkt = is_t4(q->adap->params.chip) ?
 			    CPL_TRACE_PKT : CPL_TRACE_PKT_T5;
-	u16 err_vec;
+	u16 err_vec, tnl_hdr_len = 0;
 	struct port_info *pi;
 	int ret = 0;
 
@@ -2415,16 +2455,19 @@ int t4_ethrx_handler(struct sge_rspq *q, const __be64 *rsp,
 
 	pkt = (const struct cpl_rx_pkt *)rsp;
 	/* Compressed error vector is enabled for T6 only */
-	if (q->adap->params.tp.rx_pkt_encap)
+	if (q->adap->params.tp.rx_pkt_encap) {
 		err_vec = T6_COMPR_RXERR_VEC_G(be16_to_cpu(pkt->err_vec));
-	else
+		tnl_hdr_len = T6_RX_TNLHDR_LEN_G(ntohs(pkt->err_vec));
+	} else {
 		err_vec = be16_to_cpu(pkt->err_vec);
+	}
 
 	csum_ok = pkt->csum_calc && !err_vec &&
 		  (q->netdev->features & NETIF_F_RXCSUM);
-	if ((pkt->l2info & htonl(RXF_TCP_F)) &&
+	if (((pkt->l2info & htonl(RXF_TCP_F)) ||
+	     tnl_hdr_len) &&
 	    (q->netdev->features & NETIF_F_GRO) && csum_ok && !pkt->ip_frag) {
-		do_gro(rxq, si, pkt);
+		do_gro(rxq, si, pkt, tnl_hdr_len);
 		return 0;
 	}
 
@@ -2471,7 +2514,13 @@ int t4_ethrx_handler(struct sge_rspq *q, const __be64 *rsp,
 		} else if (pkt->l2info & htonl(RXF_IP_F)) {
 			__sum16 c = (__force __sum16)pkt->csum;
 			skb->csum = csum_unfold(c);
-			skb->ip_summed = CHECKSUM_COMPLETE;
+
+			if (tnl_hdr_len) {
+				skb->ip_summed = CHECKSUM_UNNECESSARY;
+				skb->csum_level = 1;
+			} else {
+				skb->ip_summed = CHECKSUM_COMPLETE;
+			}
 			rxq->stats.rx_cso++;
 		}
 	} else {