be2net: Handle transmit completion errors in Lancer

If the driver receives a TX CQE with status as 0x1 or 0x9 or 0xb,
the completion indexes should not be used. The driver must stop
consuming CQEs from this TXQ/CQ. The TXQ from this point on-wards
to be in a bad state. Driver should destroy and recreate the TXQ.

0x1: LANCER_TX_COMP_LSO_ERR
0x9 LANCER_TX_COMP_SGE_ERR
0xb: LANCER_TX_COMP_PARITY_ERR

Reset the adapter if driver sees this error in TX completion. Also
adding sge error counter in ethtool stats.
Signed-off-by: Suresh Reddy <suresh.reddy@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/emulex/benet/be.h

@@ -248,6 +248,7 @@ struct be_tx_stats {
 	u32 tx_spoof_check_err;
 	u32 tx_qinq_err;
 	u32 tx_internal_parity_err;
+	u32 tx_sge_err;
 	struct u64_stats_sync sync;
 	struct u64_stats_sync sync_compl;
 };
@@ -944,8 +945,10 @@ static inline bool is_ipv6_ext_hdr(struct sk_buff *skb)
 #define BE_ERROR_EEH		1
 #define BE_ERROR_UE		BIT(1)
 #define BE_ERROR_FW		BIT(2)
-#define BE_ERROR_HW		(BE_ERROR_EEH | BE_ERROR_UE)
-#define BE_ERROR_ANY		(BE_ERROR_EEH | BE_ERROR_UE | BE_ERROR_FW)
+#define BE_ERROR_TX		BIT(3)
+#define BE_ERROR_HW		(BE_ERROR_EEH | BE_ERROR_UE | BE_ERROR_TX)
+#define BE_ERROR_ANY		(BE_ERROR_EEH | BE_ERROR_UE | BE_ERROR_FW | \
+				 BE_ERROR_TX)
 #define BE_CLEAR_ALL		0xFF
 
 static inline u8 be_check_error(struct be_adapter *adapter, u32 err_type)

drivers/net/ethernet/emulex/benet/be_ethtool.c

@@ -189,6 +189,7 @@ static const struct be_ethtool_stat et_tx_stats[] = {
 	 * packet data. This counter is applicable only for Lancer adapters.
 	 */
 	{DRVSTAT_TX_INFO(tx_internal_parity_err)},
+	{DRVSTAT_TX_INFO(tx_sge_err)},
 	{DRVSTAT_TX_INFO(tx_bytes)},
 	{DRVSTAT_TX_INFO(tx_pkts)},
 	{DRVSTAT_TX_INFO(tx_vxlan_offload_pkts)},

drivers/net/ethernet/emulex/benet/be_hw.h

@@ -261,6 +261,7 @@ struct be_eth_hdr_wrb {
 #define LANCER_TX_COMP_HSW_DROP_MAC_ERR		0x3
 #define LANCER_TX_COMP_HSW_DROP_VLAN_ERR	0x5
 #define LANCER_TX_COMP_QINQ_ERR			0x7
+#define LANCER_TX_COMP_SGE_ERR			0x9
 #define LANCER_TX_COMP_PARITY_ERR		0xb
 #define LANCER_TX_COMP_DMA_ERR			0xd
 

drivers/net/ethernet/emulex/benet/be_main.c

@@ -2583,7 +2583,48 @@ static void be_post_rx_frags(struct be_rx_obj *rxo, gfp_t gfp, u32 frags_needed)
 	}
 }
 
-static struct be_tx_compl_info *be_tx_compl_get(struct be_tx_obj *txo)
+static inline void be_update_tx_err(struct be_tx_obj *txo, u8 status)
+{
+	switch (status) {
+	case BE_TX_COMP_HDR_PARSE_ERR:
+		tx_stats(txo)->tx_hdr_parse_err++;
+		break;
+	case BE_TX_COMP_NDMA_ERR:
+		tx_stats(txo)->tx_dma_err++;
+		break;
+	case BE_TX_COMP_ACL_ERR:
+		tx_stats(txo)->tx_spoof_check_err++;
+		break;
+	}
+}
+
+static inline void lancer_update_tx_err(struct be_tx_obj *txo, u8 status)
+{
+	switch (status) {
+	case LANCER_TX_COMP_LSO_ERR:
+		tx_stats(txo)->tx_tso_err++;
+		break;
+	case LANCER_TX_COMP_HSW_DROP_MAC_ERR:
+	case LANCER_TX_COMP_HSW_DROP_VLAN_ERR:
+		tx_stats(txo)->tx_spoof_check_err++;
+		break;
+	case LANCER_TX_COMP_QINQ_ERR:
+		tx_stats(txo)->tx_qinq_err++;
+		break;
+	case LANCER_TX_COMP_PARITY_ERR:
+		tx_stats(txo)->tx_internal_parity_err++;
+		break;
+	case LANCER_TX_COMP_DMA_ERR:
+		tx_stats(txo)->tx_dma_err++;
+		break;
+	case LANCER_TX_COMP_SGE_ERR:
+		tx_stats(txo)->tx_sge_err++;
+		break;
+	}
+}
+
+static struct be_tx_compl_info *be_tx_compl_get(struct be_adapter *adapter,
+						struct be_tx_obj *txo)
 {
 	struct be_queue_info *tx_cq = &txo->cq;
 	struct be_tx_compl_info *txcp = &txo->txcp;
@@ -2599,6 +2640,24 @@ static struct be_tx_compl_info *be_tx_compl_get(struct be_tx_obj *txo)
 	txcp->status = GET_TX_COMPL_BITS(status, compl);
 	txcp->end_index = GET_TX_COMPL_BITS(wrb_index, compl);
 
+	if (txcp->status) {
+		if (lancer_chip(adapter)) {
+			lancer_update_tx_err(txo, txcp->status);
+			/* Reset the adapter incase of TSO,
+			 * SGE or Parity error
+			 */
+			if (txcp->status == LANCER_TX_COMP_LSO_ERR ||
+			    txcp->status == LANCER_TX_COMP_PARITY_ERR ||
+			    txcp->status == LANCER_TX_COMP_SGE_ERR)
+				be_set_error(adapter, BE_ERROR_TX);
+		} else {
+			be_update_tx_err(txo, txcp->status);
+		}
+	}
+
+	if (be_check_error(adapter, BE_ERROR_TX))
+		return NULL;
+
 	compl->dw[offsetof(struct amap_eth_tx_compl, valid) / 32] = 0;
 	queue_tail_inc(tx_cq);
 	return txcp;
@@ -2741,7 +2800,7 @@ static void be_tx_compl_clean(struct be_adapter *adapter)
 			cmpl = 0;
 			num_wrbs = 0;
 			txq = &txo->q;
-			while ((txcp = be_tx_compl_get(txo))) {
+			while ((txcp = be_tx_compl_get(adapter, txo))) {
 				num_wrbs +=
 					be_tx_compl_process(adapter, txo,
 							    txcp->end_index);
@@ -3120,42 +3179,6 @@ static int be_process_rx(struct be_rx_obj *rxo, struct napi_struct *napi,
 	return work_done;
 }
 
-static inline void be_update_tx_err(struct be_tx_obj *txo, u8 status)
-{
-	switch (status) {
-	case BE_TX_COMP_HDR_PARSE_ERR:
-		tx_stats(txo)->tx_hdr_parse_err++;
-		break;
-	case BE_TX_COMP_NDMA_ERR:
-		tx_stats(txo)->tx_dma_err++;
-		break;
-	case BE_TX_COMP_ACL_ERR:
-		tx_stats(txo)->tx_spoof_check_err++;
-		break;
-	}
-}
-
-static inline void lancer_update_tx_err(struct be_tx_obj *txo, u8 status)
-{
-	switch (status) {
-	case LANCER_TX_COMP_LSO_ERR:
-		tx_stats(txo)->tx_tso_err++;
-		break;
-	case LANCER_TX_COMP_HSW_DROP_MAC_ERR:
-	case LANCER_TX_COMP_HSW_DROP_VLAN_ERR:
-		tx_stats(txo)->tx_spoof_check_err++;
-		break;
-	case LANCER_TX_COMP_QINQ_ERR:
-		tx_stats(txo)->tx_qinq_err++;
-		break;
-	case LANCER_TX_COMP_PARITY_ERR:
-		tx_stats(txo)->tx_internal_parity_err++;
-		break;
-	case LANCER_TX_COMP_DMA_ERR:
-		tx_stats(txo)->tx_dma_err++;
-		break;
-	}
-}
 
 static void be_process_tx(struct be_adapter *adapter, struct be_tx_obj *txo,
 			  int idx)
@@ -3163,16 +3186,9 @@ static void be_process_tx(struct be_adapter *adapter, struct be_tx_obj *txo,
 	int num_wrbs = 0, work_done = 0;
 	struct be_tx_compl_info *txcp;
 
-	while ((txcp = be_tx_compl_get(txo))) {
+	while ((txcp = be_tx_compl_get(adapter, txo))) {
 		num_wrbs += be_tx_compl_process(adapter, txo, txcp->end_index);
 		work_done++;
-
-		if (txcp->status) {
-			if (lancer_chip(adapter))
-				lancer_update_tx_err(txo, txcp->status);
-			else
-				be_update_tx_err(txo, txcp->status);
-		}
 	}
 
 	if (work_done) {