[ofa-general] [PATCH 4/10] IB/ipoib: Add LSO support to ipoib
Eli Cohen
eli at dev.mellanox.co.il
Mon Mar 17 08:23:55 PDT 2008
>From 7d2a91c6ac83e9af3141b5e4d73a757bf9159b44 Mon Sep 17 00:00:00 2001
From: Eli Cohen <eli at mellanox.co.il>
Date: Thu, 28 Feb 2008 14:13:45 +0200
Subject: [PATCH] IB/ipoib: Add LSO support to ipoib
Signed-off-by: Eli Cohen <eli at mellnaox.co.il>
---
drivers/infiniband/ulp/ipoib/ipoib.h | 1 +
drivers/infiniband/ulp/ipoib/ipoib_cm.c | 7 +-
drivers/infiniband/ulp/ipoib/ipoib_ib.c | 117 +++++++++++++++++++++-------
drivers/infiniband/ulp/ipoib/ipoib_main.c | 10 ++-
drivers/infiniband/ulp/ipoib/ipoib_verbs.c | 3 +
5 files changed, 103 insertions(+), 35 deletions(-)
diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index 08930ca..19a41ff 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -319,6 +319,7 @@ struct ipoib_dev_priv {
struct dentry *mcg_dentry;
struct dentry *path_dentry;
#endif
+ int hca_caps;
};
struct ipoib_ah {
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_cm.c b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
index edf63dc..90ff2c9 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_cm.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
@@ -1384,7 +1384,7 @@ 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_SG);
+ dev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO);
priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
ipoib_flush_paths(dev);
@@ -1396,8 +1396,11 @@ static ssize_t set_mode(struct device *d, struct device_attribute *attr,
dev->mtu = min(priv->mcast_mtu, dev->mtu);
ipoib_flush_paths(dev);
- if (test_bit(IPOIB_FLAG_CSUM, &priv->flags))
+ if (test_bit(IPOIB_FLAG_CSUM, &priv->flags)) {
dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG;
+ if (priv->hca_caps & IB_DEVICE_TCP_TSO)
+ 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 d13f4fb..6605109 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -39,6 +39,8 @@
#include <linux/dma-mapping.h>
#include <rdma/ib_cache.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
#include "ipoib.h"
@@ -249,29 +251,37 @@ static int ipoib_dma_map_tx(struct ib_device *ca,
struct sk_buff *skb = tx_req->skb;
u64 *mapping = tx_req->mapping;
int i;
+ int off;
- 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;
+ 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;
for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
- mapping[i + 1] = ib_dma_map_page(ca, frag->page,
+ 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 + 1])))
+ 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);
-
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);
}
+
+ if (off)
+ ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
+
return -EIO;
}
@@ -281,12 +291,17 @@ static void ipoib_dma_unmap_tx(struct ib_device *ca,
struct sk_buff *skb = tx_req->skb;
u64 *mapping = tx_req->mapping;
int i;
+ 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;
for (i = 0; i < skb_shinfo(skb)->nr_frags; ++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);
}
}
@@ -392,24 +407,40 @@ 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);
}
@@ -418,14 +449,35 @@ 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;
-
- 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;
+ 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;
+ }
+ 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",
@@ -453,8 +505,7 @@ 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);
@@ -470,6 +521,12 @@ 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 40db0d9..bba286c 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -1134,14 +1134,15 @@ static struct net_device *ipoib_add_port(const char *format,
hca->name, result);
goto device_init_failed;
}
+ priv->hca_caps = device_attr->device_cap_flags;
- if (device_attr->device_cap_flags & IB_DEVICE_UD_IP_CSUM) {
+ kfree(device_attr);
+
+ if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
set_bit(IPOIB_FLAG_CSUM, &priv->flags);
priv->dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM;
}
- kfree(device_attr);
-
/*
* Set the full membership bit, so that we join the right
* broadcast group, etc.
@@ -1176,6 +1177,9 @@ static struct net_device *ipoib_add_port(const char *format,
goto event_failed;
}
+ if (priv->dev->features & NETIF_F_SG && priv->hca_caps & 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 a3aeb91..1d59f27 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_verbs.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_verbs.c
@@ -192,6 +192,9 @@ int ipoib_transport_dev_init(struct net_device *dev, struct ib_device *ca)
init_attr.send_cq = priv->cq;
init_attr.recv_cq = priv->cq;
+ if (priv->hca_caps & IB_DEVICE_TCP_TSO)
+ init_attr.create_flags = QP_CREATE_LSO;
+
if (dev->features & NETIF_F_SG)
init_attr.cap.max_send_sge = MAX_SKB_FRAGS + 1;
--
1.5.4.4
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