Here's a patch for discussion for an API and implementation that should allow
canceling a sent MAD.
The primary use of the call is to cancel a MAD with a large timeout, but it should
also allow cancel sending a large RMPP MAD.
- Sean
--
Index: access/ib_mad.c
===================================================================
--- access/ib_mad.c (revision 913)
+++ access/ib_mad.c (working copy)
@@ -1028,6 +1028,54 @@
}
}
+int ib_cancel_mad(struct ib_mad_agent *mad_agent,
+ u64 wr_id)
+{
+ struct ib_mad_agent_private *mad_agent_priv;
+ struct ib_mad_send_wr_private *mad_send_wr;
+ struct ib_mad_send_wc mad_send_wc;
+ unsigned long flags;
+
+ mad_agent_priv = container_of(mad_agent, struct ib_mad_agent_private,
+ agent);
+ spin_lock_irqsave(&mad_agent_priv->send_list_lock, flags);
+ list_for_each_entry(mad_send_wr, &mad_agent_priv->send_list,
+ agent_send_list) {
+ if (mad_send_wr->wr_id == wr_id)
+ goto found;
+ }
+ spin_unlock_irqrestore(&mad_agent_priv->send_list_lock, flags);
+ return -EINVAL;
+
+found:
+ if (mad_send_wr->status == IB_WC_SUCCESS)
+ mad_send_wr->status = IB_WC_WR_FLUSH_ERR;
+
+ if (mad_send_wr->timeout_ms) {
+ mad_send_wr->timeout_ms = 0;
+ mad_send_wr->refcount--;
+ }
+
+ if (mad_send_wr->refcount == 0) {
+ list_del(&mad_send_wr->agent_send_list);
+ spin_unlock_irqrestore(&mad_agent_priv->send_list_lock, flags);
+
+ mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
+ mad_send_wc.vendor_err = 0;
+ mad_send_wc.wr_id = mad_send_wr->wr_id;
+ mad_agent_priv->agent.send_handler(&mad_agent_priv->agent,
+ &mad_send_wc);
+
+ kfree(mad_send_wr);
+ if (atomic_dec_and_test(&mad_agent_priv->refcount))
+ wake_up(&mad_agent_priv->wait);
+ return 0;
+ }
+ spin_unlock_irqrestore(&mad_agent_priv->send_list_lock, flags);
+ return -EBUSY;
+}
+EXPORT_SYMBOL(ib_cancel_mad);
+
/*
* IB MAD thread
*/
Index: include/ib_mad.h
===================================================================
--- include/ib_mad.h (revision 913)
+++ include/ib_mad.h (working copy)
@@ -275,6 +275,17 @@
void ib_free_recv_mad(struct ib_mad_recv_wc *mad_recv_wc);
/**
+ * ib_cancel_mad - Cancels an outstanding send MAD operation.
+ * @mad_agent - Specifies the registration associated with sent MAD.
+ * @wr_id - Indicates the work request identifier of the MAD to cancel.
+ *
+ * If the MAD is successfully canceled, it will be returned to the user through
+ * the corresponding ib_mad_send_handler.
+ */
+int ib_cancel_mad(struct ib_mad_agent *mad_agent,
+ u64 wr_id);
+
+/**
* ib_redirect_mad_qp - Registers a QP for MAD services.
* @qp - Reference to a QP that requires MAD services.
* @rmpp_version - If set, indicates that the client will send
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