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authorJack Morgenstein <jackm@mellanox.co.il>2006-03-03 21:54:13 -0800
committerRoland Dreier <rolandd@cisco.com>2006-03-20 10:08:23 -0800
commitf36e1793e25513380cae5958a9164d4cc4458ad0 (patch)
treeaa31d34ee07971645af6f21068709166420caee2 /drivers/infiniband/core/mad_rmpp.c
parent6ecb0c849625e830ab96495d473bb704812c30e1 (diff)
IB/umad: Add support for large RMPP transfers
Add support for sending and receiving large RMPP transfers. The old code supports transfers only as large as a single contiguous kernel memory allocation. This patch uses linked list of memory buffers when sending and receiving data to avoid needing contiguous pages for larger transfers. Receive side: copy the arriving MADs in chunks instead of coalescing to one large buffer in kernel space. Send side: split a multipacket MAD buffer to a list of segments, (multipacket_list) and send these using a gather list of size 2. Also, save pointer to last sent segment, and retrieve requested segments by walking list starting at last sent segment. Finally, save pointer to last-acked segment. When retrying, retrieve segments for resending relative to this pointer. When updating last ack, start at this pointer. Signed-off-by: Jack Morgenstein <jackm@mellanox.co.il> Signed-off-by: Sean Hefty <sean.hefty@intel.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/core/mad_rmpp.c')
-rw-r--r--drivers/infiniband/core/mad_rmpp.c148
1 files changed, 48 insertions, 100 deletions
diff --git a/drivers/infiniband/core/mad_rmpp.c b/drivers/infiniband/core/mad_rmpp.c
index 3249e1d8c07b..bacfdd5bddad 100644
--- a/drivers/infiniband/core/mad_rmpp.c
+++ b/drivers/infiniband/core/mad_rmpp.c
@@ -111,14 +111,14 @@ static int data_offset(u8 mgmt_class)
return IB_MGMT_RMPP_HDR;
}
-static void format_ack(struct ib_rmpp_mad *ack,
+static void format_ack(struct ib_mad_send_buf *msg,
struct ib_rmpp_mad *data,
struct mad_rmpp_recv *rmpp_recv)
{
+ struct ib_rmpp_mad *ack = msg->mad;
unsigned long flags;
- memcpy(&ack->mad_hdr, &data->mad_hdr,
- data_offset(data->mad_hdr.mgmt_class));
+ memcpy(ack, &data->mad_hdr, msg->hdr_len);
ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK;
@@ -135,16 +135,16 @@ static void ack_recv(struct mad_rmpp_recv *rmpp_recv,
struct ib_mad_recv_wc *recv_wc)
{
struct ib_mad_send_buf *msg;
- int ret;
+ int ret, hdr_len;
+ hdr_len = data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp,
- recv_wc->wc->pkey_index, 1, IB_MGMT_RMPP_HDR,
- IB_MGMT_RMPP_DATA, GFP_KERNEL);
+ recv_wc->wc->pkey_index, 1, hdr_len,
+ 0, GFP_KERNEL);
if (!msg)
return;
- format_ack(msg->mad, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad,
- rmpp_recv);
+ format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv);
msg->ah = rmpp_recv->ah;
ret = ib_post_send_mad(msg, NULL);
if (ret)
@@ -156,16 +156,17 @@ static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent,
{
struct ib_mad_send_buf *msg;
struct ib_ah *ah;
+ int hdr_len;
ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc,
recv_wc->recv_buf.grh, agent->port_num);
if (IS_ERR(ah))
return (void *) ah;
+ hdr_len = data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
msg = ib_create_send_mad(agent, recv_wc->wc->src_qp,
recv_wc->wc->pkey_index, 1,
- IB_MGMT_RMPP_HDR, IB_MGMT_RMPP_DATA,
- GFP_KERNEL);
+ hdr_len, 0, GFP_KERNEL);
if (IS_ERR(msg))
ib_destroy_ah(ah);
else
@@ -195,8 +196,7 @@ static void nack_recv(struct ib_mad_agent_private *agent,
return;
rmpp_mad = msg->mad;
- memcpy(rmpp_mad, recv_wc->recv_buf.mad,
- data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class));
+ memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION;
@@ -433,44 +433,6 @@ static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
return rmpp_wc;
}
-void ib_coalesce_recv_mad(struct ib_mad_recv_wc *mad_recv_wc, void *buf)
-{
- struct ib_mad_recv_buf *seg_buf;
- struct ib_rmpp_mad *rmpp_mad;
- void *data;
- int size, len, offset;
- u8 flags;
-
- len = mad_recv_wc->mad_len;
- if (len <= sizeof(struct ib_mad)) {
- memcpy(buf, mad_recv_wc->recv_buf.mad, len);
- return;
- }
-
- offset = data_offset(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
-
- list_for_each_entry(seg_buf, &mad_recv_wc->rmpp_list, list) {
- rmpp_mad = (struct ib_rmpp_mad *)seg_buf->mad;
- flags = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr);
-
- if (flags & IB_MGMT_RMPP_FLAG_FIRST) {
- data = rmpp_mad;
- size = sizeof(*rmpp_mad);
- } else {
- data = (void *) rmpp_mad + offset;
- if (flags & IB_MGMT_RMPP_FLAG_LAST)
- size = len;
- else
- size = sizeof(*rmpp_mad) - offset;
- }
-
- memcpy(buf, data, size);
- len -= size;
- buf += size;
- }
-}
-EXPORT_SYMBOL(ib_coalesce_recv_mad);
-
static struct ib_mad_recv_wc *
continue_rmpp(struct ib_mad_agent_private *agent,
struct ib_mad_recv_wc *mad_recv_wc)
@@ -570,50 +532,33 @@ start_rmpp(struct ib_mad_agent_private *agent,
return mad_recv_wc;
}
-static inline u64 get_seg_addr(struct ib_mad_send_wr_private *mad_send_wr)
-{
- return mad_send_wr->sg_list[0].addr + mad_send_wr->data_offset +
- (sizeof(struct ib_rmpp_mad) - mad_send_wr->data_offset) *
- (mad_send_wr->seg_num - 1);
-}
-
static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
{
struct ib_rmpp_mad *rmpp_mad;
int timeout;
- u32 paylen;
+ u32 paylen = 0;
rmpp_mad = mad_send_wr->send_buf.mad;
ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
- rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(mad_send_wr->seg_num);
+ rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num);
if (mad_send_wr->seg_num == 1) {
rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
- paylen = mad_send_wr->total_seg * IB_MGMT_RMPP_DATA -
+ paylen = mad_send_wr->send_buf.seg_count * IB_MGMT_RMPP_DATA -
mad_send_wr->pad;
- rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
- mad_send_wr->sg_list[0].length = sizeof(struct ib_rmpp_mad);
- } else {
- mad_send_wr->send_wr.num_sge = 2;
- mad_send_wr->sg_list[0].length = mad_send_wr->data_offset;
- mad_send_wr->sg_list[1].addr = get_seg_addr(mad_send_wr);
- mad_send_wr->sg_list[1].length = sizeof(struct ib_rmpp_mad) -
- mad_send_wr->data_offset;
- mad_send_wr->sg_list[1].lkey = mad_send_wr->sg_list[0].lkey;
- rmpp_mad->rmpp_hdr.paylen_newwin = 0;
}
- if (mad_send_wr->seg_num == mad_send_wr->total_seg) {
+ if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) {
rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
paylen = IB_MGMT_RMPP_DATA - mad_send_wr->pad;
- rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
}
+ rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
/* 2 seconds for an ACK until we can find the packet lifetime */
timeout = mad_send_wr->send_buf.timeout_ms;
if (!timeout || timeout > 2000)
mad_send_wr->timeout = msecs_to_jiffies(2000);
- mad_send_wr->seg_num++;
+
return ib_send_mad(mad_send_wr);
}
@@ -629,7 +574,7 @@ static void abort_send(struct ib_mad_agent_private *agent, __be64 tid,
if (!mad_send_wr)
goto out; /* Unmatched send */
- if ((mad_send_wr->last_ack == mad_send_wr->total_seg) ||
+ if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
(!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
goto out; /* Send is already done */
@@ -645,6 +590,18 @@ out:
spin_unlock_irqrestore(&agent->lock, flags);
}
+static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr,
+ int seg_num)
+{
+ struct list_head *list;
+
+ wr->last_ack = seg_num;
+ list = &wr->last_ack_seg->list;
+ list_for_each_entry(wr->last_ack_seg, list, list)
+ if (wr->last_ack_seg->num == seg_num)
+ break;
+}
+
static void process_rmpp_ack(struct ib_mad_agent_private *agent,
struct ib_mad_recv_wc *mad_recv_wc)
{
@@ -675,11 +632,12 @@ static void process_rmpp_ack(struct ib_mad_agent_private *agent,
if (!mad_send_wr)
goto out; /* Unmatched ACK */
- if ((mad_send_wr->last_ack == mad_send_wr->total_seg) ||
+ if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
(!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
goto out; /* Send is already done */
- if (seg_num > mad_send_wr->total_seg || seg_num > mad_send_wr->newwin) {
+ if (seg_num > mad_send_wr->send_buf.seg_count ||
+ seg_num > mad_send_wr->newwin) {
spin_unlock_irqrestore(&agent->lock, flags);
abort_send(agent, rmpp_mad->mad_hdr.tid,
IB_MGMT_RMPP_STATUS_S2B);
@@ -691,11 +649,11 @@ static void process_rmpp_ack(struct ib_mad_agent_private *agent,
goto out; /* Old ACK */
if (seg_num > mad_send_wr->last_ack) {
- mad_send_wr->last_ack = seg_num;
+ adjust_last_ack(mad_send_wr, seg_num);
mad_send_wr->retries = mad_send_wr->send_buf.retries;
}
mad_send_wr->newwin = newwin;
- if (mad_send_wr->last_ack == mad_send_wr->total_seg) {
+ if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
/* If no response is expected, the ACK completes the send */
if (!mad_send_wr->send_buf.timeout_ms) {
struct ib_mad_send_wc wc;
@@ -714,7 +672,7 @@ static void process_rmpp_ack(struct ib_mad_agent_private *agent,
mad_send_wr->send_buf.timeout_ms);
} else if (mad_send_wr->refcount == 1 &&
mad_send_wr->seg_num < mad_send_wr->newwin &&
- mad_send_wr->seg_num <= mad_send_wr->total_seg) {
+ mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) {
/* Send failure will just result in a timeout/retry */
ret = send_next_seg(mad_send_wr);
if (ret)
@@ -838,31 +796,19 @@ out:
int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
{
struct ib_rmpp_mad *rmpp_mad;
- int i, total_len, ret;
+ int ret;
rmpp_mad = mad_send_wr->send_buf.mad;
if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
IB_MGMT_RMPP_FLAG_ACTIVE))
return IB_RMPP_RESULT_UNHANDLED;
- if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
+ if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) {
+ mad_send_wr->seg_num = 1;
return IB_RMPP_RESULT_INTERNAL;
+ }
- if (mad_send_wr->send_wr.num_sge > 1)
- return -EINVAL; /* TODO: support num_sge > 1 */
-
- mad_send_wr->seg_num = 1;
mad_send_wr->newwin = 1;
- mad_send_wr->data_offset = data_offset(rmpp_mad->mad_hdr.mgmt_class);
-
- total_len = 0;
- for (i = 0; i < mad_send_wr->send_wr.num_sge; i++)
- total_len += mad_send_wr->send_wr.sg_list[i].length;
-
- mad_send_wr->total_seg = (total_len - mad_send_wr->data_offset) /
- (sizeof(struct ib_rmpp_mad) - mad_send_wr->data_offset);
- mad_send_wr->pad = total_len - IB_MGMT_RMPP_HDR -
- be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
/* We need to wait for the final ACK even if there isn't a response */
mad_send_wr->refcount += (mad_send_wr->timeout == 0);
@@ -893,14 +839,14 @@ int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
if (!mad_send_wr->timeout)
return IB_RMPP_RESULT_PROCESSED; /* Response received */
- if (mad_send_wr->last_ack == mad_send_wr->total_seg) {
+ if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
mad_send_wr->timeout =
msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
return IB_RMPP_RESULT_PROCESSED; /* Send done */
}
- if (mad_send_wr->seg_num > mad_send_wr->newwin ||
- mad_send_wr->seg_num > mad_send_wr->total_seg)
+ if (mad_send_wr->seg_num == mad_send_wr->newwin ||
+ mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count)
return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
ret = send_next_seg(mad_send_wr);
@@ -921,10 +867,12 @@ int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
IB_MGMT_RMPP_FLAG_ACTIVE))
return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
- if (mad_send_wr->last_ack == mad_send_wr->total_seg)
+ if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count)
return IB_RMPP_RESULT_PROCESSED;
- mad_send_wr->seg_num = mad_send_wr->last_ack + 1;
+ mad_send_wr->seg_num = mad_send_wr->last_ack;
+ mad_send_wr->cur_seg = mad_send_wr->last_ack_seg;
+
ret = send_next_seg(mad_send_wr);
if (ret)
return IB_RMPP_RESULT_PROCESSED;