mad_rmpp.c

来自「LINUX 2.6.17.4的源码」· C语言 代码 · 共 862 行 · 第 1/2 页

	int seg_num;
	unsigned long flags;

	rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
	if (!rmpp_recv)
		goto drop1;

	seg_num = get_seg_num(&mad_recv_wc->recv_buf);

	spin_lock_irqsave(&rmpp_recv->lock, flags);
	if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
	    (seg_num > rmpp_recv->newwin))
		goto drop3;

	if ((seg_num <= rmpp_recv->last_ack) ||
	    (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
		spin_unlock_irqrestore(&rmpp_recv->lock, flags);
		ack_recv(rmpp_recv, mad_recv_wc);
		goto drop2;
	}

	prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
	if (!prev_buf)
		goto drop3;

	done_wc = NULL;
	list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
	if (rmpp_recv->cur_seg_buf == prev_buf) {
		update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
		if (get_last_flag(rmpp_recv->cur_seg_buf)) {
			rmpp_recv->state = RMPP_STATE_COMPLETE;
			spin_unlock_irqrestore(&rmpp_recv->lock, flags);
			done_wc = complete_rmpp(rmpp_recv);
			goto out;
		} else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
			rmpp_recv->newwin += window_size(agent);
			spin_unlock_irqrestore(&rmpp_recv->lock, flags);
			ack_recv(rmpp_recv, mad_recv_wc);
			goto out;
		}
	}
	spin_unlock_irqrestore(&rmpp_recv->lock, flags);
out:
	deref_rmpp_recv(rmpp_recv);
	return done_wc;

drop3:	spin_unlock_irqrestore(&rmpp_recv->lock, flags);
drop2:	deref_rmpp_recv(rmpp_recv);
drop1:	ib_free_recv_mad(mad_recv_wc);
	return NULL;
}

static struct ib_mad_recv_wc *
start_rmpp(struct ib_mad_agent_private *agent,
	   struct ib_mad_recv_wc *mad_recv_wc)
{
	struct mad_rmpp_recv *rmpp_recv;
	unsigned long flags;

	rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
	if (!rmpp_recv) {
		ib_free_recv_mad(mad_recv_wc);
		return NULL;
	}

	spin_lock_irqsave(&agent->lock, flags);
	if (insert_rmpp_recv(agent, rmpp_recv)) {
		spin_unlock_irqrestore(&agent->lock, flags);
		/* duplicate first MAD */
		destroy_rmpp_recv(rmpp_recv);
		return continue_rmpp(agent, mad_recv_wc);
	}
	atomic_inc(&rmpp_recv->refcount);

	if (get_last_flag(&mad_recv_wc->recv_buf)) {
		rmpp_recv->state = RMPP_STATE_COMPLETE;
		spin_unlock_irqrestore(&agent->lock, flags);
		complete_rmpp(rmpp_recv);
	} else {
		spin_unlock_irqrestore(&agent->lock, flags);
		/* 40 seconds until we can find the packet lifetimes */
		queue_delayed_work(agent->qp_info->port_priv->wq,
				   &rmpp_recv->timeout_work,
				   msecs_to_jiffies(40000));
		rmpp_recv->newwin += window_size(agent);
		ack_recv(rmpp_recv, mad_recv_wc);
		mad_recv_wc = NULL;
	}
	deref_rmpp_recv(rmpp_recv);
	return mad_recv_wc;
}

static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
{
	struct ib_rmpp_mad *rmpp_mad;
	int timeout;
	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);

	if (mad_send_wr->seg_num == 1) {
		rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
		paylen = mad_send_wr->send_buf.seg_count * IB_MGMT_RMPP_DATA -
			 mad_send_wr->pad;
	}

	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);

	/* 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);

	return ib_send_mad(mad_send_wr);
}

static void abort_send(struct ib_mad_agent_private *agent,
		       struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status)
{
	struct ib_mad_send_wr_private *mad_send_wr;
	struct ib_mad_send_wc wc;
	unsigned long flags;

	spin_lock_irqsave(&agent->lock, flags);
	mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
	if (!mad_send_wr)
		goto out;	/* Unmatched send */

	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 */

	ib_mark_mad_done(mad_send_wr);
	spin_unlock_irqrestore(&agent->lock, flags);

	wc.status = IB_WC_REM_ABORT_ERR;
	wc.vendor_err = rmpp_status;
	wc.send_buf = &mad_send_wr->send_buf;
	ib_mad_complete_send_wr(mad_send_wr, &wc);
	return;
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)
{
	struct ib_mad_send_wr_private *mad_send_wr;
	struct ib_rmpp_mad *rmpp_mad;
	unsigned long flags;
	int seg_num, newwin, ret;

	rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
	if (rmpp_mad->rmpp_hdr.rmpp_status) {
		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
		return;
	}

	seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
	newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
	if (newwin < seg_num) {
		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
		return;
	}

	spin_lock_irqsave(&agent->lock, flags);
	mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
	if (!mad_send_wr)
		goto out;	/* Unmatched ACK */

	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->send_buf.seg_count ||
	    seg_num > mad_send_wr->newwin) {
		spin_unlock_irqrestore(&agent->lock, flags);
		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
		return;
	}

	if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
		goto out;	/* Old ACK */

	if (seg_num > mad_send_wr->last_ack) {
		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->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;

			ib_mark_mad_done(mad_send_wr);
			spin_unlock_irqrestore(&agent->lock, flags);

			wc.status = IB_WC_SUCCESS;
			wc.vendor_err = 0;
			wc.send_buf = &mad_send_wr->send_buf;
			ib_mad_complete_send_wr(mad_send_wr, &wc);
			return;
		}
		if (mad_send_wr->refcount == 1)
			ib_reset_mad_timeout(mad_send_wr,
					     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->send_buf.seg_count) {
		/* Send failure will just result in a timeout/retry */
		ret = send_next_seg(mad_send_wr);
		if (ret)
			goto out;

		mad_send_wr->refcount++;
		list_del(&mad_send_wr->agent_list);
		list_add_tail(&mad_send_wr->agent_list,
			      &mad_send_wr->mad_agent_priv->send_list);
	}
out:
	spin_unlock_irqrestore(&agent->lock, flags);
}

static struct ib_mad_recv_wc *
process_rmpp_data(struct ib_mad_agent_private *agent,
		  struct ib_mad_recv_wc *mad_recv_wc)
{
	struct ib_rmpp_hdr *rmpp_hdr;
	u8 rmpp_status;

	rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;

	if (rmpp_hdr->rmpp_status) {
		rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
		goto bad;
	}

	if (rmpp_hdr->seg_num == __constant_htonl(1)) {
		if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) {
			rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
			goto bad;
		}
		return start_rmpp(agent, mad_recv_wc);
	} else {
		if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
			rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
			goto bad;
		}
		return continue_rmpp(agent, mad_recv_wc);
	}
bad:
	nack_recv(agent, mad_recv_wc, rmpp_status);
	ib_free_recv_mad(mad_recv_wc);
	return NULL;
}

static void process_rmpp_stop(struct ib_mad_agent_private *agent,
			      struct ib_mad_recv_wc *mad_recv_wc)
{
	struct ib_rmpp_mad *rmpp_mad;

	rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;

	if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
	} else
		abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
}

static void process_rmpp_abort(struct ib_mad_agent_private *agent,
			       struct ib_mad_recv_wc *mad_recv_wc)
{
	struct ib_rmpp_mad *rmpp_mad;

	rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;

	if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
	    rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
	} else
		abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
}

struct ib_mad_recv_wc *
ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
			struct ib_mad_recv_wc *mad_recv_wc)
{
	struct ib_rmpp_mad *rmpp_mad;

	rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
	if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
		return mad_recv_wc;

	if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
		goto out;
	}

	switch (rmpp_mad->rmpp_hdr.rmpp_type) {
	case IB_MGMT_RMPP_TYPE_DATA:
		return process_rmpp_data(agent, mad_recv_wc);
	case IB_MGMT_RMPP_TYPE_ACK:
		process_rmpp_ack(agent, mad_recv_wc);
		break;
	case IB_MGMT_RMPP_TYPE_STOP:
		process_rmpp_stop(agent, mad_recv_wc);
		break;
	case IB_MGMT_RMPP_TYPE_ABORT:
		process_rmpp_abort(agent, mad_recv_wc);
		break;
	default:
		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
		break;
	}
out:
	ib_free_recv_mad(mad_recv_wc);
	return NULL;
}

int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
{
	struct ib_rmpp_mad *rmpp_mad;
	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) {
		mad_send_wr->seg_num = 1;
		return IB_RMPP_RESULT_INTERNAL;
	}

	mad_send_wr->newwin = 1;

	/* We need to wait for the final ACK even if there isn't a response */
	mad_send_wr->refcount += (mad_send_wr->timeout == 0);
	ret = send_next_seg(mad_send_wr);
	if (!ret)
		return IB_RMPP_RESULT_CONSUMED;
	return ret;
}

int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
			    struct ib_mad_send_wc *mad_send_wc)
{
	struct ib_rmpp_mad *rmpp_mad;
	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; /* RMPP not active */

	if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
		return IB_RMPP_RESULT_INTERNAL;	 /* ACK, STOP, or ABORT */

	if (mad_send_wc->status != IB_WC_SUCCESS ||
	    mad_send_wr->status != IB_WC_SUCCESS)
		return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */

	if (!mad_send_wr->timeout)
		return IB_RMPP_RESULT_PROCESSED; /* Response received */

	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->send_buf.seg_count)
		return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */

	ret = send_next_seg(mad_send_wr);
	if (ret) {
		mad_send_wc->status = IB_WC_GENERAL_ERR;
		return IB_RMPP_RESULT_PROCESSED;
	}
	return IB_RMPP_RESULT_CONSUMED;
}

int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
{
	struct ib_rmpp_mad *rmpp_mad;
	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; /* RMPP not active */

	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;
	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;

	return IB_RMPP_RESULT_CONSUMED;
}