net: aquantia: fix LRO with FCS error

[ Upstream commit eaeb3b74 ]

Driver stops producing skbs on ring if a packet with FCS error
was coalesced into LRO session. Ring gets hang forever.

Thats a logical error in driver processing descriptors:
When rx_stat indicates MAC Error, next pointer and eop flags
are not filled. This confuses driver so it waits for descriptor 0
to be filled by HW.

Solution is fill next pointer and eop flag even for packets with FCS error.

Fixes: bab6de8f ("net: ethernet: aquantia: Atlantic A0 and B0 specific functions.")
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: Dmitry Bogdanov <dmitry.bogdanov@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c

@@ -702,7 +702,7 @@ static int hw_atl_b0_hw_ring_rx_receive(struct aq_hw_s *self,
 		if ((rx_stat & BIT(0)) || rxd_wb->type & 0x1000U) {
 			/* MAC error or DMA error */
 			buff->is_error = 1U;
-		} else {
+		}
 		if (self->aq_nic_cfg->is_rss) {
 			/* last 4 byte */
 			u16 rss_type = rxd_wb->type & 0xFU;
@@ -722,6 +722,10 @@ static int hw_atl_b0_hw_ring_rx_receive(struct aq_hw_s *self,
 			buff->next = 0U;
 			buff->is_eop = 1U;
 		} else {
+			buff->len =
+				rxd_wb->pkt_len > AQ_CFG_RX_FRAME_MAX ?
+				AQ_CFG_RX_FRAME_MAX : rxd_wb->pkt_len;
+
 			if (HW_ATL_B0_RXD_WB_STAT2_RSCCNT &
 				rxd_wb->status) {
 				/* LRO */
@@ -736,7 +740,6 @@ static int hw_atl_b0_hw_ring_rx_receive(struct aq_hw_s *self,
 			}
 		}
 	}
-	}
 
 	return aq_hw_err_from_flags(self);
 }