sfc_ef100: TX path for EF100 NICs

Includes checksum offload and TSO, so declare those in our netdev features.
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/ef100_nic.c

@@ -263,6 +263,9 @@ static int ef100_ev_process(struct efx_channel *channel, int quota)
 		case ESE_GZ_EF100_EV_MCDI:
 			efx_mcdi_process_event(channel, p_event);
 			break;
+		case ESE_GZ_EF100_EV_TX_COMPLETION:
+			ef100_ev_tx(channel, p_event);
+			break;
 		case ESE_GZ_EF100_EV_DRIVER:
 			netif_info(efx, drv, efx->net_dev,
 				   "Driver initiated event " EFX_QWORD_FMT "\n",
@@ -436,10 +439,15 @@ static unsigned int ef100_check_caps(const struct efx_nic *efx,
 
 /*	NIC level access functions
  */
+#define EF100_OFFLOAD_FEATURES	(NETIF_F_HW_CSUM |			\
+	NETIF_F_HIGHDMA | NETIF_F_SG | NETIF_F_FRAGLIST |		\
+	NETIF_F_TSO_ECN | NETIF_F_TSO_MANGLEID | NETIF_F_HW_VLAN_CTAG_TX)
+
 const struct efx_nic_type ef100_pf_nic_type = {
 	.revision = EFX_REV_EF100,
 	.is_vf = false,
 	.probe = ef100_probe_pf,
+	.offload_features = EF100_OFFLOAD_FEATURES,
 	.mcdi_max_ver = 2,
 	.mcdi_request = ef100_mcdi_request,
 	.mcdi_poll_response = ef100_mcdi_poll_response,

drivers/net/ethernet/sfc/ef100_tx.h

@@ -17,6 +17,10 @@
 int ef100_tx_probe(struct efx_tx_queue *tx_queue);
 void ef100_tx_init(struct efx_tx_queue *tx_queue);
 void ef100_tx_write(struct efx_tx_queue *tx_queue);
+void ef100_notify_tx_desc(struct efx_tx_queue *tx_queue);
+unsigned int ef100_tx_max_skb_descs(struct efx_nic *efx);
+
+void ef100_ev_tx(struct efx_channel *channel, const efx_qword_t *p_event);
 
 netdev_tx_t ef100_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb);
 #endif

drivers/net/ethernet/sfc/net_driver.h

@@ -173,6 +173,7 @@ struct efx_tx_buffer {
 #define EFX_TX_BUF_MAP_SINGLE	8	/* buffer was mapped with dma_map_single() */
 #define EFX_TX_BUF_OPTION	0x10	/* empty buffer for option descriptor */
 #define EFX_TX_BUF_XDP		0x20	/* buffer was sent with XDP */
+#define EFX_TX_BUF_TSO_V3	0x40	/* empty buffer for a TSO_V3 descriptor */
 
 /**
  * struct efx_tx_queue - An Efx TX queue
@@ -245,6 +246,7 @@ struct efx_tx_buffer {
  * @pio_packets: Number of times the TX PIO feature has been used
  * @xmit_more_available: Are any packets waiting to be pushed to the NIC
  * @cb_packets: Number of times the TX copybreak feature has been used
+ * @notify_count: Count of notified descriptors to the NIC
  * @empty_read_count: If the completion path has seen the queue as empty
  *	and the transmission path has not yet checked this, the value of
  *	@read_count bitwise-added to %EFX_EMPTY_COUNT_VALID; otherwise 0.
@@ -292,6 +294,7 @@ struct efx_tx_queue {
 	unsigned int pio_packets;
 	bool xmit_more_available;
 	unsigned int cb_packets;
+	unsigned int notify_count;
 	/* Statistics to supplement MAC stats */
 	unsigned long tx_packets;
 
@@ -1669,6 +1672,24 @@ static inline void efx_xmit_hwtstamp_pending(struct sk_buff *skb)
 	skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
 }
 
+/* Get the max fill level of the TX queues on this channel */
+static inline unsigned int
+efx_channel_tx_fill_level(struct efx_channel *channel)
+{
+	struct efx_tx_queue *tx_queue;
+	unsigned int fill_level = 0;
+
+	/* This function is currently only used by EF100, which maybe
+	 * could do something simpler and just compute the fill level
+	 * of the single TXQ that's really in use.
+	 */
+	efx_for_each_channel_tx_queue(tx_queue, channel)
+		fill_level = max(fill_level,
+				 tx_queue->insert_count - tx_queue->read_count);
+
+	return fill_level;
+}
+
 /* Get all supported features.
  * If a feature is not fixed, it is present in hw_features.
  * If a feature is fixed, it does not present in hw_features, but

drivers/net/ethernet/sfc/tx_common.c

@@ -71,6 +71,7 @@ void efx_init_tx_queue(struct efx_tx_queue *tx_queue)
 		  "initialising TX queue %d\n", tx_queue->queue);
 
 	tx_queue->insert_count = 0;
+	tx_queue->notify_count = 0;
 	tx_queue->write_count = 0;
 	tx_queue->packet_write_count = 0;
 	tx_queue->old_write_count = 0;