sfc: Disable TX descriptor prefetch watchdog

This hardware watchdog can misfire, so it does more harm than good.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/sfc/nic.c b/drivers/net/sfc/nic.c
index a577be2..db44224 100644 (file)
--- a/drivers/net/sfc/nic.c
+++ b/drivers/net/sfc/nic.c
@@ -1576,6 +1576,8 @@ void efx_nic_init_common(struct efx_nic *efx)
        EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_SOFT_EVT_EN, 1);
        /* Prefetch threshold 2 => fetch when descriptor cache half empty */
        EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_PREF_THRESHOLD, 2);
+       /* Disable hardware watchdog which can misfire */
+       EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_PREF_WD_TMR, 0x3fffff);
        /* Squash TX of packets of 16 bytes or less */
        if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0)
                EFX_SET_OWORD_FIELD(temp, FRF_BZ_TX_FLUSH_MIN_LEN_EN, 1);