forked from Minki/linux
IB/mad: Add support for dual-sided RMPP transfers.
The implementation assumes that any RMPP request that requires a response uses DS RMPP. Based on the RMPP start-up scenarios defined by the spec, this should be a valid assumption. That is, there is no start-up scenario defined where an RMPP request is followed by a non-RMPP response. By having this assumption we avoid any API changes. In order for a node that supports DS RMPP to communicate with one that does not, RMPP responses assume a new window size of 1 if a DS ACK has not been received. (By DS ACK, I'm referring to the turn-around ACK after the final ACK of the request.) This is a slight spec deviation, but is necessary to allow communication with nodes that do not generate the DS ACK. It also handles the case when a response is sent after the request state has been discarded. Signed-off-by: Sean Hefty <sean.hefty@intel.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
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@ -60,6 +60,7 @@ struct mad_rmpp_recv {
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int last_ack;
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int seg_num;
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int newwin;
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int repwin;
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__be64 tid;
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u32 src_qp;
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@ -170,6 +171,32 @@ static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent,
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return msg;
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}
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static void ack_ds_ack(struct ib_mad_agent_private *agent,
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struct ib_mad_recv_wc *recv_wc)
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{
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struct ib_mad_send_buf *msg;
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struct ib_rmpp_mad *rmpp_mad;
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int ret;
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msg = alloc_response_msg(&agent->agent, recv_wc);
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if (IS_ERR(msg))
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return;
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rmpp_mad = msg->mad;
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memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
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rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
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ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
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rmpp_mad->rmpp_hdr.seg_num = 0;
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rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(1);
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ret = ib_post_send_mad(msg, NULL);
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if (ret) {
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ib_destroy_ah(msg->ah);
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ib_free_send_mad(msg);
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}
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}
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void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc)
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{
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struct ib_rmpp_mad *rmpp_mad = mad_send_wc->send_buf->mad;
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@ -271,6 +298,7 @@ create_rmpp_recv(struct ib_mad_agent_private *agent,
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rmpp_recv->newwin = 1;
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rmpp_recv->seg_num = 1;
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rmpp_recv->last_ack = 0;
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rmpp_recv->repwin = 1;
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mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
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rmpp_recv->tid = mad_hdr->tid;
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@ -591,6 +619,16 @@ static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr,
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break;
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}
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static void process_ds_ack(struct ib_mad_agent_private *agent,
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struct ib_mad_recv_wc *mad_recv_wc, int newwin)
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{
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struct mad_rmpp_recv *rmpp_recv;
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rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
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if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE)
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rmpp_recv->repwin = newwin;
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}
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static void process_rmpp_ack(struct ib_mad_agent_private *agent,
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struct ib_mad_recv_wc *mad_recv_wc)
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{
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@ -616,8 +654,18 @@ static void process_rmpp_ack(struct ib_mad_agent_private *agent,
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spin_lock_irqsave(&agent->lock, flags);
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mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
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if (!mad_send_wr)
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goto out; /* Unmatched ACK */
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if (!mad_send_wr) {
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if (!seg_num)
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process_ds_ack(agent, mad_recv_wc, newwin);
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goto out; /* Unmatched or DS RMPP ACK */
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}
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if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) &&
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(mad_send_wr->timeout)) {
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spin_unlock_irqrestore(&agent->lock, flags);
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ack_ds_ack(agent, mad_recv_wc);
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return; /* Repeated ACK for DS RMPP transaction */
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}
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if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
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(!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
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@ -656,6 +704,9 @@ static void process_rmpp_ack(struct ib_mad_agent_private *agent,
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if (mad_send_wr->refcount == 1)
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ib_reset_mad_timeout(mad_send_wr,
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mad_send_wr->send_buf.timeout_ms);
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spin_unlock_irqrestore(&agent->lock, flags);
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ack_ds_ack(agent, mad_recv_wc);
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return;
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} else if (mad_send_wr->refcount == 1 &&
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mad_send_wr->seg_num < mad_send_wr->newwin &&
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mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) {
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@ -772,6 +823,39 @@ out:
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return NULL;
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}
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static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr)
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{
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struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv;
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struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad;
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struct mad_rmpp_recv *rmpp_recv;
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struct ib_ah_attr ah_attr;
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unsigned long flags;
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int newwin = 1;
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if (!(mad_hdr->method & IB_MGMT_METHOD_RESP))
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goto out;
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spin_lock_irqsave(&agent->lock, flags);
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list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
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if (rmpp_recv->tid != mad_hdr->tid ||
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rmpp_recv->mgmt_class != mad_hdr->mgmt_class ||
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rmpp_recv->class_version != mad_hdr->class_version ||
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(rmpp_recv->method & IB_MGMT_METHOD_RESP))
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continue;
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if (ib_query_ah(mad_send_wr->send_buf.ah, &ah_attr))
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continue;
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if (rmpp_recv->slid == ah_attr.dlid) {
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newwin = rmpp_recv->repwin;
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break;
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}
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}
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spin_unlock_irqrestore(&agent->lock, flags);
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out:
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return newwin;
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}
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int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
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{
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struct ib_rmpp_mad *rmpp_mad;
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@ -787,7 +871,7 @@ int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
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return IB_RMPP_RESULT_INTERNAL;
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}
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mad_send_wr->newwin = 1;
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mad_send_wr->newwin = init_newwin(mad_send_wr);
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/* We need to wait for the final ACK even if there isn't a response */
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mad_send_wr->refcount += (mad_send_wr->timeout == 0);
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