[ewg] [RFC][2/2] IPoIB UD 4K MTU support
Shirley Ma
mashirle at us.ibm.com
Thu Mar 20 11:22:18 PDT 2008
This patch enabled 4K MTU support for IPoIB UD.
I fixed unnecessary define in [RFC][1/2] patch
since there is only 2 buffers are needed. I will
integrate any comments later for this patchset and
resubmit it. I have touched test this patch for branch-2.6.25
git tree.
Signed-off-by: Shirley Ma <xma at us.ibm.com>
---
drivers/infiniband/ulp/ipoib/ipoib.h | 13 +---
drivers/infiniband/ulp/ipoib/ipoib_ib.c | 86 +++++++++++++----------
drivers/infiniband/ulp/ipoib/ipoib_main.c | 19 ++++--
drivers/infiniband/ulp/ipoib/ipoib_multicast.c | 3 +-
drivers/infiniband/ulp/ipoib/ipoib_verbs.c | 15 ++++-
drivers/infiniband/ulp/ipoib/ipoib_vlan.c | 1 +
6 files changed, 83 insertions(+), 54 deletions(-)
diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index 73a8fe5..fcbb618 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -56,14 +56,11 @@
/* constants */
enum {
- IPOIB_PACKET_SIZE = 2048,
- IPOIB_BUF_SIZE = IPOIB_PACKET_SIZE + IB_GRH_BYTES,
-
IPOIB_ENCAP_LEN = 4,
IPOIB_UD_MAX_PAYLOAD = 4096,
IPOIB_UD_HEAD_SIZE = IB_GRH_BYTES + IPOIB_ENCAP_LEN,
- IPOIB_UD_RX_SG = (IPOIB_UD_MAX_PAYLOAD + IB_GRH_BYTES) / PAGE_SIZE,
+ IPOIB_UD_RX_SG = 2, /* max buffer needed */
IPOIB_CM_MTU = 0x10000 - 0x10, /* padding to align header to 16 */
IPOIB_CM_BUF_SIZE = IPOIB_CM_MTU + IPOIB_ENCAP_LEN,
@@ -142,11 +139,6 @@ struct ipoib_mcast {
struct ipoib_rx_buf {
struct sk_buff *skb;
- u64 mapping;
-};
-
-struct ipoib_ud_rx_buf {
- struct sk_buff *skb;
u64 mapping[IPOIB_UD_RX_SG];
};
@@ -310,6 +302,9 @@ struct ipoib_dev_priv {
struct ib_send_wr tx_wr;
unsigned tx_outstanding;
+ struct ib_recv_wr rx_wr;
+ struct ib_sge rx_sge[IPOIB_UD_RX_SG];
+
struct ib_wc ibwc[IPOIB_NUM_WC];
struct list_head dead_ahs;
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_cm.c b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_fs.c b/drivers/infiniband/ulp/ipoib/ipoib_fs.c
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
index 9d3e778..072acc2 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -90,25 +90,18 @@ void ipoib_free_ah(struct kref *kref)
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;
+ priv->rx_wr.wr_id = id | IPOIB_OP_RECV;
+ priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
+ priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];
+
- 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);
+ ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
if (unlikely(ret)) {
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);
+ ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
dev_kfree_skb_any(priv->rx_ring[id].skb);
priv->rx_ring[id].skb = NULL;
}
@@ -116,15 +109,22 @@ static int ipoib_ib_post_receive(struct net_device *dev, int id)
return ret;
}
-static int ipoib_alloc_rx_skb(struct net_device *dev, int id)
+static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev,
+ int id,
+ u64 mapping[IPOIB_UD_RX_SG])
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct sk_buff *skb;
- u64 addr;
+ int buf_size;
+
+ if (ipoib_ud_need_sg(priv->max_ib_mtu))
+ buf_size = IPOIB_UD_HEAD_SIZE;
+ else
+ buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
- skb = dev_alloc_skb(IPOIB_BUF_SIZE + 4);
- if (!skb)
- return -ENOMEM;
+ skb = dev_alloc_skb(buf_size + 4);
+ if (unlikely(!skb))
+ return NULL;
/*
* IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
@@ -133,17 +133,31 @@ 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,
- DMA_FROM_DEVICE);
- if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
+ mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
+ DMA_FROM_DEVICE);
+ if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
dev_kfree_skb_any(skb);
- return -EIO;
+ return NULL;
+ }
+ if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
+ struct page *page = alloc_page(GFP_ATOMIC);
+ if (!page)
+ goto partial_error;
+ skb_fill_page_desc(skb, 0, page, 0, PAGE_SIZE);
+ mapping[1] = ib_dma_map_page(priv->ca,
+ skb_shinfo(skb)->frags[0].page,
+ 0, PAGE_SIZE, DMA_FROM_DEVICE);
+ if (unlikely(ib_dma_mapping_error(priv->ca, mapping[1])))
+ goto partial_error;
}
- priv->rx_ring[id].skb = skb;
- priv->rx_ring[id].mapping = addr;
+ priv->rx_ring[id].skb = skb;
+ return skb;
- return 0;
+partial_error:
+ ib_dma_unmap_single(priv->ca, mapping[0], buf_size, DMA_FROM_DEVICE);
+ dev_kfree_skb_any(skb);
+ return NULL;
}
static int ipoib_ib_post_receives(struct net_device *dev)
@@ -152,7 +166,7 @@ static int ipoib_ib_post_receives(struct net_device *dev)
int i;
for (i = 0; i < ipoib_recvq_size; ++i) {
- if (ipoib_alloc_rx_skb(dev, i)) {
+ if (!ipoib_alloc_rx_skb(dev, i, priv->rx_ring[i].mapping)) {
ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
return -ENOMEM;
}
@@ -170,7 +184,7 @@ 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;
+ u64 mapping[IPOIB_UD_RX_SG];
ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
wr_id, wc->status);
@@ -182,15 +196,13 @@ 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 (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);
+ ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
dev_kfree_skb_any(skb);
priv->rx_ring[wr_id].skb = NULL;
return;
@@ -207,7 +219,7 @@ 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 (unlikely(!ipoib_alloc_rx_skb(dev, wr_id, mapping))) {
++dev->stats.rx_dropped;
goto repost;
}
@@ -215,9 +227,11 @@ static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
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);
+ ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
+ ipoib_ud_skb_put_frags(priv, skb, wc->byte_len);
+ memcpy(priv->rx_ring[wr_id].mapping, mapping,
+ IPOIB_UD_RX_SG * sizeof *mapping);
- skb_put(skb, wc->byte_len);
skb_pull(skb, IB_GRH_BYTES);
skb->protocol = ((struct ipoib_header *) skb->data)->proto;
@@ -679,10 +693,8 @@ int ipoib_ib_dev_stop(struct net_device *dev, int flush)
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);
+ ipoib_ud_dma_unmap_rx(priv,
+ priv->rx_ring[i].mapping);
dev_kfree_skb_any(rx_req->skb);
rx_req->skb = NULL;
}
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index f96477a..c46a401 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -194,7 +194,7 @@ static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
return 0;
}
- if (new_mtu > IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN)
+ if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
return -EINVAL;
priv->admin_mtu = new_mtu;
@@ -969,10 +969,6 @@ static void ipoib_setup(struct net_device *dev)
NETIF_F_LLTX |
NETIF_F_HIGHDMA);
- /* MTU will be reset when mcast join happens */
- dev->mtu = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
- priv->mcast_mtu = priv->admin_mtu = dev->mtu;
-
memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
netif_carrier_off(dev);
@@ -1104,6 +1100,7 @@ static struct net_device *ipoib_add_port(const char *format,
struct ib_device *hca, u8 port)
{
struct ipoib_dev_priv *priv;
+ struct ib_port_attr attr;
int result = -ENOMEM;
priv = ipoib_intf_alloc(format);
@@ -1112,6 +1109,18 @@ static struct net_device *ipoib_add_port(const char *format,
SET_NETDEV_DEV(priv->dev, hca->dma_device);
+ if (!ib_query_port(hca, port, &attr))
+ priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
+ else {
+ printk(KERN_WARNING "%s: ib_query_port %d failed\n",
+ hca->name, port);
+ goto device_init_failed;
+ }
+
+ /* MTU will be reset when mcast join happens */
+ priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
+ priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu;
+
result = ib_query_pkey(hca, port, 0, &priv->pkey);
if (result) {
printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index 2628339..e235b65 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -567,8 +567,7 @@ void ipoib_mcast_join_task(struct work_struct *work)
return;
}
- priv->mcast_mtu = ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu) -
- IPOIB_ENCAP_LEN;
+ priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
if (!ipoib_cm_admin_enabled(dev))
dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_verbs.c b/drivers/infiniband/ulp/ipoib/ipoib_verbs.c
index a3aeb91..e4406cc 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_verbs.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_verbs.c
@@ -150,7 +150,7 @@ int ipoib_transport_dev_init(struct net_device *dev, struct ib_device *ca)
.max_send_wr = ipoib_sendq_size,
.max_recv_wr = ipoib_recvq_size,
.max_send_sge = 1,
- .max_recv_sge = 1
+ .max_recv_sge = IPOIB_UD_RX_SG
},
.sq_sig_type = IB_SIGNAL_ALL_WR,
.qp_type = IB_QPT_UD
@@ -212,6 +212,19 @@ int ipoib_transport_dev_init(struct net_device *dev, struct ib_device *ca)
priv->tx_wr.sg_list = priv->tx_sge;
priv->tx_wr.send_flags = IB_SEND_SIGNALED;
+ priv->rx_sge[0].lkey = priv->mr->lkey;
+ if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
+ priv->rx_sge[0].length = IPOIB_UD_HEAD_SIZE;
+ priv->rx_sge[1].length = PAGE_SIZE;
+ priv->rx_sge[1].lkey = priv->mr->lkey;
+ priv->rx_wr.num_sge = IPOIB_UD_RX_SG;
+ } else {
+ priv->rx_sge[0].length = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
+ priv->rx_wr.num_sge = 1;
+ }
+ priv->rx_wr.next = NULL;
+ priv->rx_wr.sg_list = priv->rx_sge;
+
return 0;
out_free_cq:
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
index 293f5b8..431fdea 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
@@ -89,6 +89,7 @@ int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
goto err;
}
+ priv->max_ib_mtu = ppriv->max_ib_mtu;
set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
priv->pkey = pkey;
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