[ofw] [Patch][IPoIB_NDIS6_CM] Recv shutter fix when init process fails

[Alex Naslednikov]

This patch fix the situation when init process fails (say, __ib_mgr_init fails)  and then ipoib_restart is called.
Shutter is shut  first time at the end of the init process. Thus, if init will fail, shutter will be never shut,
while ipoib_restart will try to alive such shutter.
Signed-off by: Alexander Naslednikov (xalex at mellanox.co.il)
Index: ulp/ipoib_NDIS6_CM/kernel/ipoib_port.cpp
===================================================================
--- ulp/ipoib_NDIS6_CM/kernel/ipoib_port.cpp                (revision 2986)
+++ ulp/ipoib_NDIS6_CM/kernel/ipoib_port.cpp             (working copy)
@@ -1110,10 +1110,23 @@
                qp_create.rq_sge = 2;   /* To support buffers spanning pages. */
                qp_create.h_rq_cq = p_port->ib_mgr.h_recv_cq;
                qp_create.sq_depth = p_port->p_adapter->params.sq_depth;
-
+
+             // p_ca_attrs->max_sges contains the  maximum number of SG elements
+             // available by HW. 3 of the them are reserved for an internal use
+             // Thus, the maximum of SGE for UD QP is limited by (p_ca_attrs->max_sges - 3)
 #define UD_QP_USED_SGE 3
-              qp_create.sq_sge = MAX_SEND_SGE < p_port->p_ca_attrs->max_sges ?
-                                              MAX_SEND_SGE  : ( p_port->p_ca_attrs->max_sges - UD_QP_USED_SGE );
+             if ( p_port->p_ca_attrs->max_sges > MAX_SEND_SGE )
+             {
+                             p_port->max_sq_sge_supported = MAX_SEND_SGE - UD_QP_USED_SGE;
+             }
+             else
+             {
+                             p_port->max_sq_sge_supported = p_port->p_ca_attrs->max_sges - UD_QP_USED_SGE;
+             }
+
+             p_port->p_ca_attrs->max_sges -= UD_QP_USED_SGE;
+             qp_create.sq_sge = p_port->max_sq_sge_supported;
+
                if ( !p_port->p_ca_attrs->ipoib_csum )
                {
                                /* checksum is not supported by device
@@ -1162,6 +1175,11 @@
                                                p_port->p_adapter->p_ifc->get_err_str( status )) );
                                return status;
                }
+             if ( qp_attr.sq_sge < qp_create.sq_sge)
+             {
+                             ASSERT ( FALSE );
+                             p_port->max_sq_sge_supported = qp_attr.sq_sge;
+             }
                p_port->ib_mgr.qpn = qp_attr.num;

                /* Register all of physical memory */
@@ -3799,7 +3817,7 @@
                }

                /* Remember that one of the DS entries is reserved for the IPoIB header. */
-              if( num_pages >= MAX_SEND_SGE )
+             if( num_pages >=  p_port->max_sq_sge_supported )
                {
                                IPOIB_PRINT(TRACE_LEVEL_INFORMATION, IPOIB_DBG_SEND,
                                                ("Too many buffers to fit in WR ds_array.  Copying data.\n") );
@@ -4270,13 +4288,14 @@
                   Copy only N+1-MAX_SEND_SGE, where N is a lenght of SG List
                   Remember that one of the DS entries is reserved for the IPoIB header.
                */
-              if( ( p_sgl->NumberOfElements >= MAX_SEND_SGE ||
+             if( ( p_sgl->NumberOfElements >=  s_buf->p_port->max_sq_sge_supported ||
                                p_sgl->Elements[0].Length < sizeof(eth_hdr_t)) )
                {
                                IPOIB_PRINT( TRACE_LEVEL_WARNING, IPOIB_DBG_SEND,
                                                ("Too many buffers %d to fit in WR ds_array[%d] \
                                                 Or buffer[0] length %d < Eth header. Copying data.\n",
-                                              p_sgl->NumberOfElements, MAX_SEND_SGE, p_sgl->Elements[0].Length ) );
+                                             p_sgl->NumberOfElements,  s_buf->p_port->max_sq_sge_supported ,
+                                             p_sgl->Elements[0].Length ) );

                                if( !s_buf->p_port->p_adapter->params.cm_enabled )
                                {
Index: ulp/ipoib_NDIS6_CM/kernel/ipoib_port.h
===================================================================
--- ulp/ipoib_NDIS6_CM/kernel/ipoib_port.h     (revision 2982)
+++ ulp/ipoib_NDIS6_CM/kernel/ipoib_port.h  (working copy)
@@ -590,6 +590,7 @@

                struct _ipoib_adapter    *p_adapter;
                uint8_t                                                                 port_num;
+             uint32_t                                                               max_sq_sge_supported;

                KEVENT                                                                                sa_event;

@@ -653,6 +654,9 @@
 *            port_num
 *                            Port number of this adapter.
 *
+*           max_sq_sge_supported
+*                           Maximum number of send QP SG elements supported by HW
+*
 *            ib_mgr
 *                            IB resource manager.
 *

Alexander (XaleX) Naslednikov
SW Networking Team
Mellanox Technologies

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