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IPoIB: Add send gather support 

This patch acts as a preparation for using checksum offload for IB
devices capable of inserting/verifying checksum in IP packets.  The
patch does not actaully turn on NETIF_F_SG - we defer that to the
patches adding checksum offload capabilities.

We only add support for send gathers for datagram mode, since existing
HW does not support checksum offload on connected QPs.

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Eli Cohen 2008-01-30 18:30:53 +02:00 committed by Roland Dreier
parent eb14032f9e
commit 7143740d26
4 changed files with 83 additions and 30 deletions
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4
drivers/infiniband/ulp/ipoib/ipoib.h
View File

@ -143,7 +143,7 @@ struct ipoib_rx_buf {
struct ipoib_tx_buf {
struct sk_buff *skb;
u64 mapping;
u64 mapping[MAX_SKB_FRAGS + 1];
};
struct ib_cm_id;
@ -296,7 +296,7 @@ struct ipoib_dev_priv {
struct ipoib_tx_buf *tx_ring;
unsigned tx_head;
unsigned tx_tail;
struct ib_sge tx_sge;
struct ib_sge tx_sge[MAX_SKB_FRAGS + 1];
struct ib_send_wr tx_wr;
unsigned tx_outstanding;

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

@ -634,8 +634,8 @@ static inline int post_send(struct ipoib_dev_priv *priv,
{
struct ib_send_wr *bad_wr;
priv->tx_sge.addr = addr;
priv->tx_sge.length = len;
priv->tx_sge[0].addr = addr;
priv->tx_sge[0].length = len;
priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM;
@ -676,7 +676,7 @@ void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_
return;
}
tx_req->mapping = addr;
tx_req->mapping[0] = addr;
if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
addr, skb->len))) {
@ -715,7 +715,7 @@ void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
tx_req = &tx->tx_ring[wr_id];
ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
ib_dma_unmap_single(priv->ca, tx_req->mapping[0], tx_req->skb->len, DMA_TO_DEVICE);
/* FIXME: is this right? Shouldn't we only increment on success? */
++dev->stats.tx_packets;
@ -1110,7 +1110,7 @@ timeout:
while ((int) p->tx_tail - (int) p->tx_head < 0) {
tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
ib_dma_unmap_single(priv->ca, tx_req->mapping[0], tx_req->skb->len,
DMA_TO_DEVICE);
dev_kfree_skb_any(tx_req->skb);
++p->tx_tail;

89
drivers/infiniband/ulp/ipoib/ipoib_ib.c
View File

@ -239,6 +239,54 @@ repost:
"for buf %d\n", wr_id);
}
static int ipoib_dma_map_tx(struct ib_device *ca,
struct ipoib_tx_buf *tx_req)
{
struct sk_buff *skb = tx_req->skb;
u64 *mapping = tx_req->mapping;
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;
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,
frag->page_offset, frag->size,
DMA_TO_DEVICE);
if (unlikely(ib_dma_mapping_error(ca, mapping[i + 1])))
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);
}
return -EIO;
}
static void ipoib_dma_unmap_tx(struct ib_device *ca,
struct ipoib_tx_buf *tx_req)
{
struct sk_buff *skb = tx_req->skb;
u64 *mapping = tx_req->mapping;
int i;
ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
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,
DMA_TO_DEVICE);
}
}
static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
@ -257,8 +305,7 @@ static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
tx_req = &priv->tx_ring[wr_id];
ib_dma_unmap_single(priv->ca, tx_req->mapping,
tx_req->skb->len, DMA_TO_DEVICE);
ipoib_dma_unmap_tx(priv->ca, tx_req);
++dev->stats.tx_packets;
dev->stats.tx_bytes += tx_req->skb->len;
@ -341,16 +388,23 @@ 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 addr, int len)
u64 *mapping, int headlen,
skb_frag_t *frags,
int nr_frags)
{
struct ib_send_wr *bad_wr;
int i;
priv->tx_sge.addr = addr;
priv->tx_sge.length = len;
priv->tx_wr.wr_id = wr_id;
priv->tx_wr.wr.ud.remote_qpn = qpn;
priv->tx_wr.wr.ud.ah = address;
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_wr.num_sge = nr_frags + 1;
priv->tx_wr.wr_id = wr_id;
priv->tx_wr.wr.ud.remote_qpn = qpn;
priv->tx_wr.wr.ud.ah = address;
return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
}
@ -360,7 +414,6 @@ 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;
u64 addr;
if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
@ -383,20 +436,19 @@ void ipoib_send(struct net_device *dev, struct sk_buff *skb,
*/
tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
tx_req->skb = skb;
addr = ib_dma_map_single(priv->ca, skb->data, skb->len,
DMA_TO_DEVICE);
if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
++dev->stats.tx_errors;
dev_kfree_skb_any(skb);
return;
}
tx_req->mapping = addr;
if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
address->ah, qpn, addr, skb->len))) {
address->ah, qpn,
tx_req->mapping, skb_headlen(skb),
skb_shinfo(skb)->frags, skb_shinfo(skb)->nr_frags))) {
ipoib_warn(priv, "post_send failed\n");
++dev->stats.tx_errors;
ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
ipoib_dma_unmap_tx(priv->ca, tx_req);
dev_kfree_skb_any(skb);
} else {
dev->trans_start = jiffies;
@ -615,10 +667,7 @@ int ipoib_ib_dev_stop(struct net_device *dev, int flush)
while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
tx_req = &priv->tx_ring[priv->tx_tail &
(ipoib_sendq_size - 1)];
ib_dma_unmap_single(priv->ca,
tx_req->mapping,
tx_req->skb->len,
DMA_TO_DEVICE);
ipoib_dma_unmap_tx(priv->ca, tx_req);
dev_kfree_skb_any(tx_req->skb);
++priv->tx_tail;
--priv->tx_outstanding;

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

@ -157,6 +157,7 @@ int ipoib_transport_dev_init(struct net_device *dev, struct ib_device *ca)
};
int ret, size;
int i;
priv->pd = ib_alloc_pd(priv->ca);
if (IS_ERR(priv->pd)) {
@ -191,6 +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 (dev->features & NETIF_F_SG)
init_attr.cap.max_send_sge = MAX_SKB_FRAGS + 1;
priv->qp = ib_create_qp(priv->pd, &init_attr);
if (IS_ERR(priv->qp)) {
printk(KERN_WARNING "%s: failed to create QP\n", ca->name);
@ -201,11 +205,11 @@ int ipoib_transport_dev_init(struct net_device *dev, struct ib_device *ca)
priv->dev->dev_addr[2] = (priv->qp->qp_num >> 8) & 0xff;
priv->dev->dev_addr[3] = (priv->qp->qp_num ) & 0xff;
priv->tx_sge.lkey = priv->mr->lkey;
for (i = 0; i < MAX_SKB_FRAGS + 1; ++i)
priv->tx_sge[i].lkey = priv->mr->lkey;
priv->tx_wr.opcode = IB_WR_SEND;
priv->tx_wr.sg_list = &priv->tx_sge;
priv->tx_wr.num_sge = 1;
priv->tx_wr.sg_list = priv->tx_sge;
priv->tx_wr.send_flags = IB_SEND_SIGNALED;
return 0;