[PATCH 5/9] common/sfc_efx/base: count Rx TRUNC ERR as CRC errors on X4

[Ivan Malov <ivan.malov@arknetworks.am>]

From: Andy Moreton <andy.moreton@amd.com>

On X4 the MAC hardware reports both over-size packets and CRC errors
in the RX event flag RX_TRUNC_ERR. Over-size packets are only likely
as a result of a misconfigured network, so count the RX_TRUNC_ERR
events as CRC errors.
This workaround is only needed for the per-queue counters maintained
by the driver. The DMA statistics counters maintained by firmware
are not affected.

Signed-off-by: Andy Moreton <andy.moreton@amd.com>
Signed-off-by: Viacheslav Galaktionov <viacheslav.galaktionov@arknetworks.am>
---
 drivers/common/sfc_efx/base/ef10_ev.c | 41 +++++++++++++++++++++------
 1 file changed, 33 insertions(+), 8 deletions(-)

diff --git a/drivers/common/sfc_efx/base/ef10_ev.c b/drivers/common/sfc_efx/base/ef10_ev.c
index a97c1bf43e..ea430d0d5f 100644
--- a/drivers/common/sfc_efx/base/ef10_ev.c
+++ b/drivers/common/sfc_efx/base/ef10_ev.c
@@ -418,6 +418,7 @@ ef10_ev_rx_packed_stream(
 	__in		const efx_ev_callbacks_t *eecp,
 	__in_opt	void *arg)
 {
+	efx_nic_t *enp = eep->ee_enp;
 	uint32_t label;
 	uint32_t pkt_count_lbits;
 	uint16_t flags;
@@ -466,10 +467,22 @@ ef10_ev_rx_packed_stream(
 
 	/* Check for errors that invalidate checksum and L3/L4 fields */
 	if (EFX_QWORD_FIELD(*eqp, ESF_DZ_RX_TRUNC_ERR) != 0) {
-		/* RX frame truncated */
-		EFX_EV_QSTAT_INCR(eep, EV_RX_FRM_TRUNC);
-		flags |= EFX_DISCARD;
-		goto deliver;
+		/*
+		 * X4 uses RX_TRUNC_ERR for packet size and CRC errors. Count
+		 * these as CRC errors (as over-size packets are only likely in
+		 * a misconfigured network).
+		 */
+		if (enp->en_family == EFX_FAMILY_MEDFORD4) {
+			/* Bad Ethernet frame CRC */
+			EFX_EV_QSTAT_INCR(eep, EV_RX_ETH_CRC_ERR);
+			flags |= EFX_DISCARD;
+			goto deliver;
+		} else {
+			/* RX frame truncated */
+			EFX_EV_QSTAT_INCR(eep, EV_RX_FRM_TRUNC);
+			flags |= EFX_DISCARD;
+			goto deliver;
+		}
 	}
 	if (EFX_QWORD_FIELD(*eqp, ESF_DZ_RX_ECRC_ERR) != 0) {
 		/* Bad Ethernet frame CRC */
@@ -630,10 +643,22 @@ ef10_ev_rx(
 
 	/* Check for errors that invalidate checksum and L3/L4 fields */
 	if (EFX_QWORD_FIELD(*eqp, ESF_DZ_RX_TRUNC_ERR) != 0) {
-		/* RX frame truncated */
-		EFX_EV_QSTAT_INCR(eep, EV_RX_FRM_TRUNC);
-		flags |= EFX_DISCARD;
-		goto deliver;
+		/*
+		 * X4 uses RX_TRUNC_ERR for packet size and CRC errors. Count
+		 * these as CRC errors (as over-size packets are only likely in
+		 * a misconfigured network).
+		 */
+		if (enp->en_family == EFX_FAMILY_MEDFORD4) {
+			/* Bad Ethernet frame CRC */
+			EFX_EV_QSTAT_INCR(eep, EV_RX_ETH_CRC_ERR);
+			flags |= EFX_DISCARD;
+			goto deliver;
+		} else {
+			/* RX frame truncated */
+			EFX_EV_QSTAT_INCR(eep, EV_RX_FRM_TRUNC);
+			flags |= EFX_DISCARD;
+			goto deliver;
+		}
 	}
 	if (EFX_QWORD_FIELD(*eqp, ESF_DZ_RX_ECRC_ERR) != 0) {
 		/* Bad Ethernet frame CRC */
-- 
2.47.3