IB/qib: Avoid duplicate writes to the rcv head register
Avoid duplicate writes to the head register as this can lead to lost
interrupts if the context goes full before the second write is done.
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/hw/qib/qib_driver.c b/drivers/infiniband/hw/qib/qib_driver.c
index 9cd1936..3ed0d5a 100644
--- a/drivers/infiniband/hw/qib/qib_driver.c
+++ b/drivers/infiniband/hw/qib/qib_driver.c
@@ -71,6 +71,11 @@
*/
#define QIB_PIO_MAXIBHDR 128
+/*
+ * QIB_MAX_PKT_RCV is the max # if packets processed per receive interrupt.
+ */
+#define QIB_MAX_PKT_RECV 64
+
struct qlogic_ib_stats qib_stats;
const char *qib_get_unit_name(int unit)
@@ -335,7 +340,7 @@
smp_rmb(); /* prevent speculative reads of dma'ed hdrq */
}
- for (last = 0, i = 1; !last && i <= 64; i += !last) {
+ for (last = 0, i = 1; !last; i += !last) {
hdr = dd->f_get_msgheader(dd, rhf_addr);
eflags = qib_hdrget_err_flags(rhf_addr);
etype = qib_hdrget_rcv_type(rhf_addr);
@@ -384,6 +389,9 @@
l += rsize;
if (l >= maxcnt)
l = 0;
+ if (i == QIB_MAX_PKT_RECV)
+ last = 1;
+
rhf_addr = (__le32 *) rcd->rcvhdrq + l + dd->rhf_offset;
if (dd->flags & QIB_NODMA_RTAIL) {
u32 seq = qib_hdrget_seq(rhf_addr);
