[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 10:52:25 PST 2008
This patch enables IPoIB-UD 4K MTU support. If PAGE_SIZE > 4K MTU + GRH
head + IPoIB head, then two buffers are allocated, otherwise use one
buffer.
Signed-off-by: Shirley Ma <xma at us.ibm.com>
---
drivers/infiniband/ulp/ipoib/ipoib.h | 7 +--
drivers/infiniband/ulp/ipoib/ipoib_ib.c | 90
+++++++++++++++++++------------
2 files changed, 56 insertions(+), 41 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..93025d3 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -155,29 +155,22 @@ 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;
-
- param.next = NULL;
- param.wr_id = id | IPOIB_OP_RECV;
- param.sg_list = &list;
- param.num_sge = 1;
-
- ret = ib_post_recv(priv->qp, ¶m, &bad_wr);
+ priv->rx_wr.wr_id = id | IPOIB_OP_RECV;
+ 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 +180,7 @@ 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 +191,8 @@ 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 +200,7 @@ 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 +208,15 @@ 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 +233,9 @@ 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 +247,20 @@ 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 +277,28 @@ 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 +706,19 @@ 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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