From 1f5c0239b4fc5dea895645397d5aaa3d4b95205a Mon Sep 17 00:00:00 2001
From: Michael Brown
Date: Fri, 17 Jul 2009 22:50:33 +0100
Subject: [infiniband] Centralise assumption of 2048-byte payloads

IPoIB and the SMA have separate constants for the packet size to be
used to I/O buffer allocations.  Merge these into the single
IB_MAX_PAYLOAD_SIZE constant.

(Various other points in the Infiniband stack have hard-coded
assumptions of a 2048-byte payload; we don't currently support
variable MTUs.)
---
 src/net/infiniband.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src/net/infiniband.c')

diff --git a/src/net/infiniband.c b/src/net/infiniband.c
index 1c19fada4..4784f4044 100644
--- a/src/net/infiniband.c
+++ b/src/net/infiniband.c
@@ -345,6 +345,13 @@ int ib_post_recv ( struct ib_device *ibdev, struct ib_queue_pair *qp,
 		   struct io_buffer *iobuf ) {
 	int rc;
 
+	/* Check packet length */
+	if ( iob_tailroom ( iobuf ) < IB_MAX_PAYLOAD_SIZE ) {
+		DBGC ( ibdev, "IBDEV %p QPN %#lx wrong RX buffer size (%zd)\n",
+		       ibdev, qp->qpn, iob_tailroom ( iobuf ) );
+		return -EINVAL;
+	}
+
 	/* Check queue fill level */
 	if ( qp->recv.fill >= qp->recv.num_wqes ) {
 		DBGC ( ibdev, "IBDEV %p QPN %#lx receive queue full\n",
-- 
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