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authorMichael Chan <mchan@broadcom.com>2010-04-27 11:28:09 +0000
committerDavid S. Miller <davem@davemloft.net>2010-04-27 14:38:15 -0700
commitc441b8d2cb2194b05550a558d6d95d8944e56a84 (patch)
tree10b43d1a2b35f4e9874c3bb2ac2abe25973270b4 /drivers/net
parente95ef5d3f6bc60433883e1ef65dac747acd0bf1a (diff)
bnx2: Fix lost MSI-X problem on 5709 NICs.
It has been reported that under certain heavy traffic conditions in MSI-X mode, the driver can lose an MSI-X vector causing all packets in the associated rx/tx ring pair to be dropped. The problem is caused by the chip dropping the write to unmask the MSI-X vector by the kernel (when migrating the IRQ for example). This can be prevented by increasing the GRC timeout value for these register read and write operations. Thanks to Dell for helping us debug this problem. Signed-off-by: Michael Chan <mchan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/bnx2.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index a257babd1bb..4c1e51ee8ed 100644
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -4759,8 +4759,12 @@ bnx2_reset_chip(struct bnx2 *bp, u32 reset_code)
rc = bnx2_alloc_bad_rbuf(bp);
}
- if (bp->flags & BNX2_FLAG_USING_MSIX)
+ if (bp->flags & BNX2_FLAG_USING_MSIX) {
bnx2_setup_msix_tbl(bp);
+ /* Prevent MSIX table reads and write from timing out */
+ REG_WR(bp, BNX2_MISC_ECO_HW_CTL,
+ BNX2_MISC_ECO_HW_CTL_LARGE_GRC_TMOUT_EN);
+ }
return rc;
}