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path: root/drivers/infiniband/ulp/ipoib/ipoib_ib.c
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Diffstat (limited to 'drivers/infiniband/ulp/ipoib/ipoib_ib.c')
-rw-r--r--drivers/infiniband/ulp/ipoib/ipoib_ib.c120
1 files changed, 70 insertions, 50 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
index f7440096b5ed..192fef884e21 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -95,57 +95,65 @@ void ipoib_free_ah(struct kref *kref)
}
}
-static inline int ipoib_ib_receive(struct ipoib_dev_priv *priv,
- unsigned int wr_id,
- dma_addr_t addr)
+static int ipoib_ib_post_receive(struct net_device *dev, int id)
{
- struct ib_sge list = {
- .addr = addr,
- .length = IPOIB_BUF_SIZE,
- .lkey = priv->mr->lkey,
- };
- struct ib_recv_wr param = {
- .wr_id = wr_id | IPOIB_OP_RECV,
- .sg_list = &list,
- .num_sge = 1,
- };
+ 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, &param, &bad_wr);
+ if (unlikely(ret)) {
+ ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
+ dma_unmap_single(priv->ca->dma_device,
+ 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 ib_post_recv(priv->qp, &param, &bad_wr);
+ return ret;
}
-static int ipoib_ib_post_receive(struct net_device *dev, int id)
+static int ipoib_alloc_rx_skb(struct net_device *dev, int id)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct sk_buff *skb;
dma_addr_t addr;
- int ret;
skb = dev_alloc_skb(IPOIB_BUF_SIZE + 4);
- if (!skb) {
- ipoib_warn(priv, "failed to allocate receive buffer\n");
-
- priv->rx_ring[id].skb = NULL;
+ if (!skb)
return -ENOMEM;
- }
- skb_reserve(skb, 4); /* 16 byte align IP header */
- priv->rx_ring[id].skb = skb;
+
+ /*
+ * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
+ * header. So we need 4 more bytes to get to 48 and align the
+ * IP header to a multiple of 16.
+ */
+ skb_reserve(skb, 4);
+
addr = dma_map_single(priv->ca->dma_device,
skb->data, IPOIB_BUF_SIZE,
DMA_FROM_DEVICE);
- pci_unmap_addr_set(&priv->rx_ring[id], mapping, addr);
-
- ret = ipoib_ib_receive(priv, id, addr);
- if (ret) {
- ipoib_warn(priv, "ipoib_ib_receive failed for buf %d (%d)\n",
- id, ret);
- dma_unmap_single(priv->ca->dma_device, addr,
- IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
+ if (unlikely(dma_mapping_error(addr))) {
dev_kfree_skb_any(skb);
- priv->rx_ring[id].skb = NULL;
+ return -EIO;
}
- return ret;
+ priv->rx_ring[id].skb = skb;
+ priv->rx_ring[id].mapping = addr;
+
+ return 0;
}
static int ipoib_ib_post_receives(struct net_device *dev)
@@ -154,6 +162,10 @@ static int ipoib_ib_post_receives(struct net_device *dev)
int i;
for (i = 0; i < IPOIB_RX_RING_SIZE; ++i) {
+ if (ipoib_alloc_rx_skb(dev, i)) {
+ ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
+ return -ENOMEM;
+ }
if (ipoib_ib_post_receive(dev, i)) {
ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
return -EIO;
@@ -176,28 +188,36 @@ static void ipoib_ib_handle_wc(struct net_device *dev,
wr_id &= ~IPOIB_OP_RECV;
if (wr_id < IPOIB_RX_RING_SIZE) {
- struct sk_buff *skb = priv->rx_ring[wr_id].skb;
-
- priv->rx_ring[wr_id].skb = NULL;
+ struct sk_buff *skb = priv->rx_ring[wr_id].skb;
+ dma_addr_t addr = priv->rx_ring[wr_id].mapping;
- dma_unmap_single(priv->ca->dma_device,
- pci_unmap_addr(&priv->rx_ring[wr_id],
- mapping),
- IPOIB_BUF_SIZE,
- DMA_FROM_DEVICE);
-
- if (wc->status != IB_WC_SUCCESS) {
+ 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);
+ dma_unmap_single(priv->ca->dma_device, addr,
+ IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
dev_kfree_skb_any(skb);
+ priv->rx_ring[wr_id].skb = NULL;
return;
}
+ /*
+ * 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))) {
+ ++priv->stats.rx_dropped;
+ goto repost;
+ }
+
ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
wc->byte_len, wc->slid);
+ dma_unmap_single(priv->ca->dma_device, addr,
+ IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
+
skb_put(skb, wc->byte_len);
skb_pull(skb, IB_GRH_BYTES);
@@ -220,8 +240,8 @@ static void ipoib_ib_handle_wc(struct net_device *dev,
dev_kfree_skb_any(skb);
}
- /* repost receive */
- if (ipoib_ib_post_receive(dev, wr_id))
+ repost:
+ if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
ipoib_warn(priv, "ipoib_ib_post_receive failed "
"for buf %d\n", wr_id);
} else
@@ -229,7 +249,7 @@ static void ipoib_ib_handle_wc(struct net_device *dev,
wr_id);
} else {
- struct ipoib_buf *tx_req;
+ struct ipoib_tx_buf *tx_req;
unsigned long flags;
if (wr_id >= IPOIB_TX_RING_SIZE) {
@@ -302,7 +322,7 @@ void ipoib_send(struct net_device *dev, struct sk_buff *skb,
struct ipoib_ah *address, u32 qpn)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
- struct ipoib_buf *tx_req;
+ struct ipoib_tx_buf *tx_req;
dma_addr_t addr;
if (skb->len > dev->mtu + INFINIBAND_ALEN) {
@@ -387,9 +407,9 @@ int ipoib_ib_dev_open(struct net_device *dev)
struct ipoib_dev_priv *priv = netdev_priv(dev);
int ret;
- ret = ipoib_qp_create(dev);
+ ret = ipoib_init_qp(dev);
if (ret) {
- ipoib_warn(priv, "ipoib_qp_create returned %d\n", ret);
+ ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
return -1;
}
@@ -468,7 +488,7 @@ int ipoib_ib_dev_stop(struct net_device *dev)
struct ib_qp_attr qp_attr;
int attr_mask;
unsigned long begin;
- struct ipoib_buf *tx_req;
+ struct ipoib_tx_buf *tx_req;
int i;
/* Kill the existing QP and allocate a new one */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.