Hi, Le mardi 27 janvier 2015 à 03:21 -0800, Yuval Shaia a écrit : > With this fix Scatter-Gather will be supported also in connected mode >
Please explain the issue with current kernel and the advantage of the proposed fix in the commit message. Perhaps benchmarks against various HCAs would be welcome. > Signed-off-by: Yuval Shaia <[email protected]> > --- > drivers/infiniband/ulp/ipoib/ipoib.h | 8 +-- > drivers/infiniband/ulp/ipoib/ipoib_cm.c | 107 > +++++++++++++++++++++++------ > drivers/infiniband/ulp/ipoib/ipoib_ib.c | 3 +- > drivers/infiniband/ulp/ipoib/ipoib_main.c | 3 +- > 4 files changed, 91 insertions(+), 30 deletions(-) > > diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h > b/drivers/infiniband/ulp/ipoib/ipoib.h > index d7562be..fb42834 100644 > --- a/drivers/infiniband/ulp/ipoib/ipoib.h > +++ b/drivers/infiniband/ulp/ipoib/ipoib.h > @@ -170,11 +170,6 @@ struct ipoib_tx_buf { > u64 mapping[MAX_SKB_FRAGS + 1]; > }; > > -struct ipoib_cm_tx_buf { > - struct sk_buff *skb; > - u64 mapping; > -}; > - > struct ib_cm_id; > > struct ipoib_cm_data { > @@ -233,7 +228,7 @@ struct ipoib_cm_tx { > struct net_device *dev; > struct ipoib_neigh *neigh; > struct ipoib_path *path; > - struct ipoib_cm_tx_buf *tx_ring; > + struct ipoib_tx_buf *tx_ring; > unsigned tx_head; > unsigned tx_tail; > unsigned long flags; > @@ -496,6 +491,7 @@ int ipoib_mcast_stop_thread(struct net_device *dev, int > flush); > > void ipoib_mcast_dev_down(struct net_device *dev); > void ipoib_mcast_dev_flush(struct net_device *dev); > +int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req); > > #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG > struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev); > diff --git a/drivers/infiniband/ulp/ipoib/ipoib_cm.c > b/drivers/infiniband/ulp/ipoib/ipoib_cm.c > index 933efce..056e4d2 100644 > --- a/drivers/infiniband/ulp/ipoib/ipoib_cm.c > +++ b/drivers/infiniband/ulp/ipoib/ipoib_cm.c > @@ -88,6 +88,31 @@ static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv > *priv, int frags, > ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, > DMA_FROM_DEVICE); > } > > +static void ipoib_cm_dma_unmap_tx(struct ipoib_dev_priv *priv, > + struct ipoib_tx_buf *tx_req) > +{ > + struct sk_buff *skb; > + int i, offs; > + > + skb = tx_req->skb; > + if (skb_shinfo(skb)->nr_frags) { > + offs = 0; > + if (skb_headlen(skb)) { > + ib_dma_unmap_single(priv->ca, tx_req->mapping[0], > + skb_headlen(skb), DMA_TO_DEVICE); > + offs = 1; > + } > + for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { > + const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; > + > + ib_dma_unmap_single(priv->ca, tx_req->mapping[i + offs], > + skb_frag_size(frag), DMA_TO_DEVICE); > + } > + } else > + ib_dma_unmap_single(priv->ca, tx_req->mapping[0], skb->len, > + DMA_TO_DEVICE); > +} > + > static int ipoib_cm_post_receive_srq(struct net_device *dev, int id) > { > struct ipoib_dev_priv *priv = netdev_priv(dev); > @@ -707,11 +732,39 @@ static inline int post_send(struct ipoib_dev_priv *priv, > return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr); > } > > +static inline int post_send_sg(struct ipoib_dev_priv *priv, > + struct ipoib_cm_tx *tx, > + unsigned int wr_id, > + struct sk_buff *skb, > + u64 mapping[MAX_SKB_FRAGS + 1]) > +{ > + struct ib_send_wr *bad_wr; > + int i, off; > + skb_frag_t *frags = skb_shinfo(skb)->frags; > + int nr_frags = skb_shinfo(skb)->nr_frags; > + > + if (skb_headlen(skb)) { > + priv->tx_sge[0].addr = mapping[0]; > + priv->tx_sge[0].length = skb_headlen(skb); > + off = 1; > + } else > + off = 0; > + > + for (i = 0; i < nr_frags; ++i) { > + 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 + off; > + priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM; > + > + return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr); > +} > + > void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct > ipoib_cm_tx *tx) > { > struct ipoib_dev_priv *priv = netdev_priv(dev); > - struct ipoib_cm_tx_buf *tx_req; > - u64 addr; > + struct ipoib_tx_buf *tx_req; > + u64 addr = 0; > int rc; > > if (unlikely(skb->len > tx->mtu)) { > @@ -735,24 +788,37 @@ void ipoib_cm_send(struct net_device *dev, struct > sk_buff *skb, struct ipoib_cm_ > */ > tx_req = &tx->tx_ring[tx->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))) { > - ++dev->stats.tx_errors; > - dev_kfree_skb_any(skb); > - return; > - } > > - tx_req->mapping = addr; > + if (skb_shinfo(skb)->nr_frags) { > + if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) { > + ++dev->stats.tx_errors; > + dev_kfree_skb_any(skb); > + return; > + } > + rc = post_send_sg(priv, tx, tx->tx_head & > + (ipoib_sendq_size - 1), > + skb, tx_req->mapping); > + } else { > + addr = ib_dma_map_single(priv->ca, skb->data, skb->len, > + DMA_TO_DEVICE); > + if (unlikely(ib_dma_mapping_error(priv->ca, addr))) { > + ++dev->stats.tx_errors; > + dev_kfree_skb_any(skb); > + return; > + } > + > + tx_req->mapping[0] = addr; > > - skb_orphan(skb); > - skb_dst_drop(skb); > + skb_orphan(skb); > + skb_dst_drop(skb); > > - rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), > - addr, skb->len); > + rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), > + addr, skb->len); > + } > if (unlikely(rc)) { > ipoib_warn(priv, "post_send failed, error %d\n", rc); > ++dev->stats.tx_errors; > - ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE); > + ipoib_cm_dma_unmap_tx(priv, tx_req); > dev_kfree_skb_any(skb); > } else { > dev->trans_start = jiffies; > @@ -777,7 +843,7 @@ void ipoib_cm_handle_tx_wc(struct net_device *dev, struct > ib_wc *wc) > struct ipoib_dev_priv *priv = netdev_priv(dev); > struct ipoib_cm_tx *tx = wc->qp->qp_context; > unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM; > - struct ipoib_cm_tx_buf *tx_req; > + struct ipoib_tx_buf *tx_req; > unsigned long flags; > > ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n", > @@ -791,7 +857,7 @@ 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); > + ipoib_cm_dma_unmap_tx(priv, tx_req); > > /* FIXME: is this right? Shouldn't we only increment on success? */ > ++dev->stats.tx_packets; > @@ -1036,6 +1102,9 @@ static struct ib_qp *ipoib_cm_create_tx_qp(struct > net_device *dev, struct ipoib_ > > struct ib_qp *tx_qp; > > + if (dev->features & NETIF_F_SG) > + attr.cap.max_send_sge = MAX_SKB_FRAGS + 1; > + > tx_qp = ib_create_qp(priv->pd, &attr); > if (PTR_ERR(tx_qp) == -EINVAL) { > ipoib_warn(priv, "can't use GFP_NOIO for QPs on device %s, > using GFP_KERNEL\n", > @@ -1170,7 +1239,7 @@ err_tx: > static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) > { > struct ipoib_dev_priv *priv = netdev_priv(p->dev); > - struct ipoib_cm_tx_buf *tx_req; > + struct ipoib_tx_buf *tx_req; > unsigned long begin; > > ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", > @@ -1197,8 +1266,7 @@ 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, > - DMA_TO_DEVICE); > + ipoib_cm_dma_unmap_tx(priv, tx_req); > dev_kfree_skb_any(tx_req->skb); > ++p->tx_tail; > netif_tx_lock_bh(p->dev); > @@ -1455,7 +1523,6 @@ static void ipoib_cm_stale_task(struct work_struct > *work) > spin_unlock_irq(&priv->lock); > } > > - No need to remove this line. > static ssize_t show_mode(struct device *d, struct device_attribute *attr, > char *buf) > { > diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c > b/drivers/infiniband/ulp/ipoib/ipoib_ib.c > index 72626c3..9e11447 100644 > --- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c > +++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c > @@ -312,8 +312,7 @@ repost: > "for buf %d\n", wr_id); > } > > -static int ipoib_dma_map_tx(struct ib_device *ca, > - struct ipoib_tx_buf *tx_req) > +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; > diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c > b/drivers/infiniband/ulp/ipoib/ipoib_main.c > index 58b5aa3..f9314c6 100644 > --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c > +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c > @@ -190,7 +190,7 @@ static netdev_features_t ipoib_fix_features(struct > net_device *dev, netdev_featu > struct ipoib_dev_priv *priv = netdev_priv(dev); > > if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) > - features &= ~(NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO); > + features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO); > > return features; > } > @@ -233,7 +233,6 @@ int ipoib_set_mode(struct net_device *dev, const char > *buf) > "will cause multicast packet drops\n"); > netdev_update_features(dev); > rtnl_unlock(); > - priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM; Sure about this removal ? I don't see it related to scatter-gather. > > ipoib_flush_paths(dev); > rtnl_lock(); Regards. -- Yann Droneaud OPTEYA -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
