[ofa-general] [PATCH 9/16] ib/ipoib: Add LSO support to ipoib

Eli Cohen eli at mellanox.co.il
Wed Jan 16 08:38:06 PST 2008


Add LSO support to ipoib

Signed-off-by: Eli Cohen <eli at mellnaox.co.il>
---
 drivers/infiniband/ulp/ipoib/ipoib.h       |   54 ++++++++++++-------
 drivers/infiniband/ulp/ipoib/ipoib_cm.c    |    7 ++-
 drivers/infiniband/ulp/ipoib/ipoib_ib.c    |   80 +++++++++++++++++++++------
 drivers/infiniband/ulp/ipoib/ipoib_main.c  |    8 +++-
 drivers/infiniband/ulp/ipoib/ipoib_verbs.c |    3 +-
 5 files changed, 111 insertions(+), 41 deletions(-)

diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index f0876dc..e15884c 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -151,31 +151,40 @@ static inline int ipoib_dma_map_tx(struct ib_device *ca,
 {
 	struct sk_buff *skb = tx_req->skb;
 	u64 *mapping = tx_req->mapping;
-	int frags;
 	int i;
-
-	mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
-				       DMA_TO_DEVICE);
-	if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
-		return -EIO;
-
-	frags = skb_shinfo(skb)->nr_frags;
-	for (i = 0; i < frags; ++i) {
+	int nfrags;
+	int off;
+
+	if (skb_headlen(skb)) {
+		mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
+					       DMA_TO_DEVICE);
+		if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
+			return -EIO;
+		off = 1;
+	} else
+		off = 0;
+
+	nfrags = skb_shinfo(skb)->nr_frags;
+	for (i = 0; i < nfrags; ++i) {
 		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
-		mapping[i + 1] = ib_dma_map_page(ca, frag->page,
-						 frag->page_offset, frag->size,
-						 DMA_TO_DEVICE);
-		if (unlikely(ib_dma_mapping_error(ca, mapping[i + 1])))
+		mapping[i + off] = ib_dma_map_page(ca, frag->page, frag->page_offset,
+						   frag->size, DMA_TO_DEVICE);
+		if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
 			goto partial_error;
 	}
 	return 0;
 
 partial_error:
-	ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
+	if (skb_headlen(skb)) {
+		ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
+		off = 0;
+	} else
+		off = 1;
 
 	for (; i > 0; --i) {
 		skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
-		ib_dma_unmap_page(ca, mapping[i], frag->size, DMA_TO_DEVICE);
+		ib_dma_unmap_page(ca, mapping[i - off], frag->size,
+				  DMA_TO_DEVICE);
 	}
 	return -EIO;
 }
@@ -185,15 +194,20 @@ static inline void ipoib_dma_unmap_tx(struct ib_device *ca,
 {
 	struct sk_buff *skb = tx_req->skb;
 	u64 *mapping = tx_req->mapping;
-	int frags;
 	int i;
+	int nfrags;
+	int off;
 
-	ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
+	if (skb_headlen(skb)) {
+		ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
+		off = 1;
+	} else
+		off = 0;
 
-	frags = skb_shinfo(skb)->nr_frags;
-	for (i = 0; i < frags; ++i) {
+	nfrags = skb_shinfo(skb)->nr_frags;
+	for (i = 0; i < nfrags; ++i) {
 		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
-		ib_dma_unmap_page(ca, mapping[i + 1], frag->size,
+		ib_dma_unmap_page(ca, mapping[i + off], frag->size,
 				  DMA_TO_DEVICE);
 	}
 }
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_cm.c b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
index 435ec58..c35b2e2 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_cm.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
@@ -1235,7 +1235,7 @@ static ssize_t set_mode(struct device *d, struct device_attribute *attr,
 		ipoib_warn(priv, "enabling connected mode "
 			   "will cause multicast packet drops\n");
 
-		dev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
+		dev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | NETIF_F_TSO);
 
 		priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
 
@@ -1251,6 +1251,11 @@ static ssize_t set_mode(struct device *d, struct device_attribute *attr,
 		if (priv->ca->flags & IB_DEVICE_IP_CSUM)
 			dev->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
 
+
+		if (priv->dev->features & NETIF_F_SG &&
+		    priv->ca->flags & IB_DEVICE_TCP_TSO)
+			priv->dev->features |= NETIF_F_TSO;
+
 		return count;
 	}
 
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
index ca11469..cdd8486 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -38,6 +38,7 @@
 #include <linux/delay.h>
 #include <linux/dma-mapping.h>
 #include <linux/ip.h>
+#include <linux/tcp.h>
 
 #include <rdma/ib_cache.h>
 
@@ -353,24 +354,40 @@ void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 static inline int post_send(struct ipoib_dev_priv *priv,
 			    unsigned int wr_id,
 			    struct ib_ah *address, u32 qpn,
-			    u64 *mapping, int headlen,
-			    skb_frag_t *frags,
-			    int nr_frags)
+			    struct ipoib_tx_buf *tx_req,
+			    void *head, int hlen)
 {
 	struct ib_send_wr *bad_wr;
-	int i;
+	int i, off;
+	struct sk_buff *skb = tx_req->skb;
+	skb_frag_t *frags = skb_shinfo(skb)->frags;
+	int nr_frags = skb_shinfo(skb)->nr_frags;
+	u64 *mapping = tx_req->mapping;
+
+	if (skb_headlen(skb)) {
+		priv->tx_sge[0].addr         = mapping[0];
+		priv->tx_sge[0].length       = skb_headlen(skb);
+		off = 1;
+	} else
+		off = 0;
 
-	priv->tx_sge[0].addr         = mapping[0];
-	priv->tx_sge[0].length       = headlen;
 	for (i = 0; i < nr_frags; ++i) {
-		priv->tx_sge[i + 1].addr = mapping[i + 1];
-		priv->tx_sge[i + 1].length = frags[i].size;
+		priv->tx_sge[i + off].addr = mapping[i + off];
+		priv->tx_sge[i + off].length = frags[i].size;
 	}
-	priv->tx_wr.num_sge          = nr_frags + 1;
+	priv->tx_wr.num_sge          = nr_frags + off;
 	priv->tx_wr.wr_id 	     = wr_id;
 	priv->tx_wr.wr.ud.remote_qpn = qpn;
 	priv->tx_wr.wr.ud.ah 	     = address;
 
+	if (head) {
+		priv->tx_wr.wr.ud.mss = skb_shinfo(skb)->gso_size;
+		priv->tx_wr.wr.ud.header = head;
+		priv->tx_wr.wr.ud.hlen = hlen;
+		priv->tx_wr.opcode      = IB_WR_LSO;
+	} else
+		priv->tx_wr.opcode      = IB_WR_SEND;
+
 	return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
 }
 
@@ -379,14 +396,36 @@ void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
 	struct ipoib_tx_buf *tx_req;
+	int hlen;
+	void *phead;
+
+	if (!skb_is_gso(skb)) {
+		if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
+			ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
+				   skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
+			++dev->stats.tx_dropped;
+			++dev->stats.tx_errors;
+			ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
+			return;
+		}
+		phead = 0;
+		hlen = 0;
+	} else {
+		/*
+		 * LSO header is limited to max 60 bytes
+		 */
+		if (unlikely((ip_hdr(skb)->ihl + tcp_hdr(skb)->doff) > 15)) {
+			ipoib_warn(priv, "ip(%d) and tcp(%d) headers too long, dropping skb\n",
+				   ip_hdr(skb)->ihl << 2, tcp_hdr(skb)->doff << 2);
+			goto drop;
+		}
 
-	if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
-		ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
-			   skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
-		++dev->stats.tx_dropped;
-		++dev->stats.tx_errors;
-		ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
-		return;
+		hlen = ((ip_hdr(skb)->ihl + tcp_hdr(skb)->doff) << 2) + IPOIB_ENCAP_LEN;
+		phead = skb->data;
+		if (unlikely(!skb_pull(skb, hlen))) {
+			ipoib_warn(priv, "linear data too small\n");
+			goto drop;
+		}
 	}
 
 	ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
@@ -415,8 +454,7 @@ void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 
 	if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 			       address->ah, qpn,
-			       tx_req->mapping, skb_headlen(skb),
-			       skb_shinfo(skb)->frags, skb_shinfo(skb)->nr_frags))) {
+			       tx_req, phead, hlen))) {
 		ipoib_warn(priv, "post_send failed\n");
 		++dev->stats.tx_errors;
 		ipoib_dma_unmap_tx(priv->ca, tx_req);
@@ -432,6 +470,12 @@ void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 			netif_stop_queue(dev);
 		}
 	}
+	return;
+
+drop:
+	++dev->stats.tx_errors;
+	dev_kfree_skb_any(skb);
+	return;
 }
 
 static void __ipoib_reap_ah(struct net_device *dev)
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 58fc5b3..fa93eaf 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -713,7 +713,9 @@ static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
 				goto out;
 			}
 
-			ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
+			ipoib_send(dev, skb, neigh->ah,
+				   IPOIB_QPN(skb->dst->neighbour->ha));
+
 			goto out;
 		}
 
@@ -1177,6 +1179,10 @@ static struct net_device *ipoib_add_port(const char *format,
 		goto event_failed;
 	}
 
+	if (priv->dev->features & NETIF_F_SG && priv->ca->flags & IB_DEVICE_TCP_TSO)
+		priv->dev->features |= NETIF_F_TSO;
+
+
 	result = register_netdev(priv->dev);
 	if (result) {
 		printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_verbs.c b/drivers/infiniband/ulp/ipoib/ipoib_verbs.c
index a6f5f65..f2289c6 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_verbs.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_verbs.c
@@ -153,7 +153,8 @@ int ipoib_transport_dev_init(struct net_device *dev, struct ib_device *ca)
 			.max_recv_sge = 1
 		},
 		.sq_sig_type = IB_SIGNAL_ALL_WR,
-		.qp_type     = IB_QPT_UD
+		.qp_type     = IB_QPT_UD,
+		.create_flags = QP_CREATE_LSO,
 	};
 
 	int i, ret, size;
-- 
1.5.3.8





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