[ofa-general] [V3] [PATCH 3/3] ib/ipoib: IPoIB-UD RX S/G support for 4K MTU

Shirley Ma mashirle at us.ibm.com
Sat Feb 2 14:36:54 PST 2008


This is updated patch, this patchset has been tested for both 2K MTU and
4K MTU. Here fixed a typo in 4K MTU.

Signed-off-by: Shirley Ma <xma at us.ibm.com>
---

 drivers/infiniband/ulp/ipoib/ipoib.h    |    7 +--
 drivers/infiniband/ulp/ipoib/ipoib_ib.c |   91
+++++++++++++++++++------------
 2 files changed, 58 insertions(+), 40 deletions(-)

diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h
b/drivers/infiniband/ulp/ipoib/ipoib.h
index 6b5e108..faee740 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -145,11 +145,6 @@ struct ipoib_sg_rx_buf {
 	u64		mapping[IPOIB_UD_RX_SG];
 };
 
-struct ipoib_rx_buf {
-	struct sk_buff *skb;
-	u64		mapping;
-};
-
 struct ipoib_tx_buf {
 	struct sk_buff *skb;
 	u64		mapping;
@@ -299,7 +294,7 @@ struct ipoib_dev_priv {
 	unsigned int admin_mtu;
 	unsigned int mcast_mtu;
 
-	struct ipoib_rx_buf *rx_ring;
+	struct ipoib_sg_rx_buf *rx_ring;
 
 	spinlock_t	     tx_lock;
 	struct ipoib_tx_buf *tx_ring;
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
index 9ca3d34..81a517b 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -155,29 +155,25 @@ partial_error:
 static int ipoib_ib_post_receive(struct net_device *dev, int id)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
-	struct ib_sge list;
-	struct ib_recv_wr param;
 	struct ib_recv_wr *bad_wr;
 	int ret;
 
-	list.addr     = priv->rx_ring[id].mapping;
-	list.length   = IPOIB_BUF_SIZE;
-	list.lkey     = priv->mr->lkey;
+	priv->rx_wr.wr_id = id | IPOIB_OP_RECV;
+	priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
+	priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];	
 
-	param.next    = NULL;
-	param.wr_id   = id | IPOIB_OP_RECV;
-	param.sg_list = &list;
-	param.num_sge = 1;
-
-	ret = ib_post_recv(priv->qp, &param, &bad_wr);
+	ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
 	if (unlikely(ret)) {
+		if (ipoib_ud_need_sg(priv->max_ib_mtu))
+			ipoib_sg_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
+		else 
+			ib_dma_unmap_single(priv->ca, priv->rx_ring[id].mapping[0],
+					    IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
+					    DMA_FROM_DEVICE);
 		ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
-		ib_dma_unmap_single(priv->ca, priv->rx_ring[id].mapping,
-				    IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
 		dev_kfree_skb_any(priv->rx_ring[id].skb);
 		priv->rx_ring[id].skb = NULL;
 	}
-
 	return ret;
 }
 
@@ -187,7 +183,7 @@ static int ipoib_alloc_rx_skb(struct net_device
*dev, int id)
 	struct sk_buff *skb;
 	u64 addr;
 
-	skb = dev_alloc_skb(IPOIB_BUF_SIZE + 4);
+	skb = dev_alloc_skb(IPOIB_UD_BUF_SIZE(priv->max_ib_mtu) + 4);
 	if (!skb)
 		return -ENOMEM;
 
@@ -198,7 +194,8 @@ static int ipoib_alloc_rx_skb(struct net_device
*dev, int id)
 	 */
 	skb_reserve(skb, 4);
 
-	addr = ib_dma_map_single(priv->ca, skb->data, IPOIB_BUF_SIZE,
+	addr = ib_dma_map_single(priv->ca, skb->data,
+				 IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
 				 DMA_FROM_DEVICE);
 	if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
 		dev_kfree_skb_any(skb);
@@ -206,7 +203,7 @@ static int ipoib_alloc_rx_skb(struct net_device
*dev, int id)
 	}
 
 	priv->rx_ring[id].skb     = skb;
-	priv->rx_ring[id].mapping = addr;
+	priv->rx_ring[id].mapping[0] = addr;
 
 	return 0;
 }
@@ -214,10 +211,15 @@ static int ipoib_alloc_rx_skb(struct net_device
*dev, int id)
 static int ipoib_ib_post_receives(struct net_device *dev)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
-	int i;
+	int i, ret;
 
 	for (i = 0; i < ipoib_recvq_size; ++i) {
-		if (ipoib_alloc_rx_skb(dev, i)) {
+		if (ipoib_ud_need_sg(priv->max_ib_mtu)) 
+			ret = !(ipoib_sg_alloc_rx_skb(dev, i,
+						      priv->rx_ring[i].mapping));
+		else
+			ret = ipoib_alloc_rx_skb(dev, i);
+		if (ret) {
 			ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 			return -ENOMEM;
 		}
@@ -234,8 +236,9 @@ static void ipoib_ib_handle_rx_wc(struct net_device
*dev, struct ib_wc *wc)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
 	unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
-	struct sk_buff *skb;
-	u64 addr;
+	struct sk_buff *skb, *newskb = NULL;
+	u64 mapping[IPOIB_UD_RX_SG];
+	u64 addr = 0;
 
 	ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
 		       wr_id, wc->status);
@@ -247,15 +250,20 @@ static void ipoib_ib_handle_rx_wc(struct
net_device *dev, struct ib_wc *wc)
 	}
 
 	skb  = priv->rx_ring[wr_id].skb;
-	addr = priv->rx_ring[wr_id].mapping;
+	if (!ipoib_ud_need_sg(priv->max_ib_mtu))
+		addr = priv->rx_ring[wr_id].mapping[0];
 
 	if (unlikely(wc->status != IB_WC_SUCCESS)) {
 		if (wc->status != IB_WC_WR_FLUSH_ERR)
 			ipoib_warn(priv, "failed recv event "
 				   "(status=%d, wrid=%d vend_err %x)\n",
 				   wc->status, wr_id, wc->vendor_err);
-		ib_dma_unmap_single(priv->ca, addr,
-				    IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
+		if (ipoib_ud_need_sg(priv->max_ib_mtu))
+			ipoib_sg_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
+		else 
+			ib_dma_unmap_single(priv->ca, addr,
+					    IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
+					    DMA_FROM_DEVICE);
 		dev_kfree_skb_any(skb);
 		priv->rx_ring[wr_id].skb = NULL;
 		return;
@@ -272,17 +280,28 @@ static void ipoib_ib_handle_rx_wc(struct
net_device *dev, struct ib_wc *wc)
 	 * If we can't allocate a new RX buffer, dump
 	 * this packet and reuse the old buffer.
 	 */
-	if (unlikely(ipoib_alloc_rx_skb(dev, wr_id))) {
+	if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
+		newskb = ipoib_sg_alloc_rx_skb(dev, wr_id, mapping);
+		if (unlikely(!newskb)) {
+			++dev->stats.rx_dropped;
+			goto repost;
+		}
+	} else if (unlikely(ipoib_alloc_rx_skb(dev, wr_id))) {
 		++dev->stats.rx_dropped;
 		goto repost;
 	}
 
 	ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 		       wc->byte_len, wc->slid);
-
-	ib_dma_unmap_single(priv->ca, addr, IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
-
-	skb_put(skb, wc->byte_len);
+	if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
+		ipoib_sg_dma_unmap_rx(priv, mapping);
+		ipoib_ud_skb_put_frags(skb, wc->byte_len, newskb);
+	} else {
+		ib_dma_unmap_single(priv->ca, addr,
+				    IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
+				    DMA_FROM_DEVICE);
+		skb_put(skb, wc->byte_len);
+	}
 	skb_pull(skb, IB_GRH_BYTES);
 
 	skb->protocol = ((struct ipoib_header *) skb->data)->proto;
@@ -690,15 +709,19 @@ int ipoib_ib_dev_stop(struct net_device *dev, int
flush)
 			}
 
 			for (i = 0; i < ipoib_recvq_size; ++i) {
-				struct ipoib_rx_buf *rx_req;
+				struct ipoib_sg_rx_buf *rx_req;
 
 				rx_req = &priv->rx_ring[i];
 				if (!rx_req->skb)
 					continue;
-				ib_dma_unmap_single(priv->ca,
-						    rx_req->mapping,
-						    IPOIB_BUF_SIZE,
-						    DMA_FROM_DEVICE);
+				if (ipoib_ud_need_sg(priv->max_ib_mtu))
+					ipoib_sg_dma_unmap_rx(priv,
+							      priv->rx_ring[i].mapping);
+				else
+					ib_dma_unmap_single(priv->ca,
+							    rx_req->mapping[0],
+							    IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
+							    DMA_FROM_DEVICE);
 				dev_kfree_skb_any(rx_req->skb);
 				rx_req->skb = NULL;
 			}





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