IB/ipath: Add support for 7220 receive queue changes

Newer HCAs have a HW option to write a sequence number to each receive
queue entry and avoid a separate DMA of the tail register to memory.
This patch adds support for these changes.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 8 insertions, 6 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_stats.c b/drivers/infiniband/hw/ipath/ipath_stats.c
index 57eb1d549785..adff2f10dc0e 100644
--- a/drivers/infiniband/hw/ipath/ipath_stats.c
+++ b/drivers/infiniband/hw/ipath/ipath_stats.c
@@ -136,6 +136,7 @@ static void ipath_qcheck(struct ipath_devdata *dd)
         struct ipath_portdata *pd = dd->ipath_pd[0];
         size_t blen = 0;
         char buf[128];
+        u32 hdrqtail;
 
         *buf = 0;
         if (pd->port_hdrqfull != dd->ipath_p0_hdrqfull) {
@@ -174,17 +175,18 @@ static void ipath_qcheck(struct ipath_devdata *dd)
         if (blen)
                 ipath_dbg("%s\n", buf);
 
-        if (pd->port_head != (u32)
-            le64_to_cpu(*dd->ipath_hdrqtailptr)) {
+        hdrqtail = ipath_get_hdrqtail(pd);
+        if (pd->port_head != hdrqtail) {
                 if (dd->ipath_lastport0rcv_cnt ==
                     ipath_stats.sps_port0pkts) {
                         ipath_cdbg(PKT, "missing rcv interrupts? "
-                                   "port0 hd=%llx tl=%x; port0pkts %llx\n",
-                                   (unsigned long long)
-                                   le64_to_cpu(*dd->ipath_hdrqtailptr),
-                                   pd->port_head,
+                                   "port0 hd=%x tl=%x; port0pkts %llx; write"
+                                   " hd (w/intr)\n",
+                                   pd->port_head, hdrqtail,
                                    (unsigned long long)
                                    ipath_stats.sps_port0pkts);
+                        ipath_write_ureg(dd, ur_rcvhdrhead, hdrqtail |
+                                dd->ipath_rhdrhead_intr_off, pd->port_port);
                 }
                 dd->ipath_lastport0rcv_cnt = ipath_stats.sps_port0pkts;
         }