IPoIB/cm: Reduce connected mode TX object size
Since IPoIB connected mode does not NETIF_F_SG, we only have one DMA mapping per send, so we don't need a mapping[] array. Define a new struct with a single u64 mapping member and use it for the CM tx_ring. Signed-off-by: Eli Cohen <eli@mellanox.co.il> Signed-off-by: Roland Dreier <rolandd@cisco.com>
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@ -157,6 +157,11 @@ struct ipoib_tx_buf {
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u64 mapping[MAX_SKB_FRAGS + 1];
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};
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struct ipoib_cm_tx_buf {
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struct sk_buff *skb;
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u64 mapping;
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};
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struct ib_cm_id;
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struct ipoib_cm_data {
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@ -215,7 +220,7 @@ struct ipoib_cm_tx {
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struct net_device *dev;
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struct ipoib_neigh *neigh;
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struct ipoib_path *path;
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struct ipoib_tx_buf *tx_ring;
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struct ipoib_cm_tx_buf *tx_ring;
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unsigned tx_head;
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unsigned tx_tail;
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unsigned long flags;
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@ -703,7 +703,7 @@ static inline int post_send(struct ipoib_dev_priv *priv,
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void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
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{
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struct ipoib_dev_priv *priv = netdev_priv(dev);
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struct ipoib_tx_buf *tx_req;
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struct ipoib_cm_tx_buf *tx_req;
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u64 addr;
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if (unlikely(skb->len > tx->mtu)) {
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@ -734,7 +734,7 @@ void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_
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return;
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}
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tx_req->mapping[0] = addr;
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tx_req->mapping = addr;
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if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
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addr, skb->len))) {
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@ -759,7 +759,7 @@ void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
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struct ipoib_dev_priv *priv = netdev_priv(dev);
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struct ipoib_cm_tx *tx = wc->qp->qp_context;
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unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
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struct ipoib_tx_buf *tx_req;
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struct ipoib_cm_tx_buf *tx_req;
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unsigned long flags;
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ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
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@ -773,7 +773,7 @@ void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
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tx_req = &tx->tx_ring[wr_id];
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ib_dma_unmap_single(priv->ca, tx_req->mapping[0], tx_req->skb->len, DMA_TO_DEVICE);
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ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
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/* FIXME: is this right? Shouldn't we only increment on success? */
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++dev->stats.tx_packets;
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@ -1143,7 +1143,7 @@ err_tx:
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static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
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{
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struct ipoib_dev_priv *priv = netdev_priv(p->dev);
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struct ipoib_tx_buf *tx_req;
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struct ipoib_cm_tx_buf *tx_req;
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unsigned long flags;
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unsigned long begin;
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@ -1171,7 +1171,7 @@ timeout:
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while ((int) p->tx_tail - (int) p->tx_head < 0) {
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tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
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ib_dma_unmap_single(priv->ca, tx_req->mapping[0], tx_req->skb->len,
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ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
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DMA_TO_DEVICE);
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dev_kfree_skb_any(tx_req->skb);
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++p->tx_tail;
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