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IPoIB: Add LSO support 

For HCAs that support TCP segmentation offload (IB_DEVICE_UD_TSO), set
NETIF_F_TSO and use HW LSO to offload TCP segmentation.

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Eli Cohen 2008-04-16 21:09:27 -07:00 committed by Roland Dreier
parent c93570f23a
commit 40ca1988e0
5 changed files with 91 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/infiniband/ulp/ipoib/ipoib.h
View File

@ -319,6 +319,7 @@ struct ipoib_dev_priv {
struct dentry *mcg_dentry;
struct dentry *path_dentry;
#endif
int hca_caps;
};
struct ipoib_ah {

7
drivers/infiniband/ulp/ipoib/ipoib_cm.c
View File

@ -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_UD_TSO)
dev->features |= NETIF_F_TSO;
}
return count;
}

105
drivers/infiniband/ulp/ipoib/ipoib_ib.c
View File

@ -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 +449,30 @@ 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 (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;
if (skb_is_gso(skb)) {
hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
phead = skb->data;
if (unlikely(!skb_pull(skb, hlen))) {
ipoib_warn(priv, "linear data too small\n");
++dev->stats.tx_dropped;
++dev->stats.tx_errors;
dev_kfree_skb_any(skb);
return;
}
} else {
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 = NULL;
hlen = 0;
}
ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
@ -452,9 +499,7 @@ void ipoib_send(struct net_device *dev, struct sk_buff *skb,
priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
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))) {
address->ah, qpn, tx_req, phead, hlen))) {
ipoib_warn(priv, "post_send failed\n");
++dev->stats.tx_errors;
ipoib_dma_unmap_tx(priv->ca, tx_req);

10
drivers/infiniband/ulp/ipoib/ipoib_main.c
View File

@ -1134,14 +1134,15 @@ static struct net_device *ipoib_add_port(const char *format,
kfree(device_attr);
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_UD_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",

3
drivers/infiniband/ulp/ipoib/ipoib_verbs.c
View File

@ -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_UD_TSO)
init_attr.create_flags = IB_QP_CREATE_IPOIB_UD_LSO;
if (dev->features & NETIF_F_SG)
init_attr.cap.max_send_sge = MAX_SKB_FRAGS + 1;