ethernet/sfc/tx_common.c

17 static unsigned int efx_tx_cb_page_count(struct efx_tx_queue *tx_queue)
19 	return DIV_ROUND_UP(tx_queue->ptr_mask + 1,
23 int efx_probe_tx_queue(struct efx_tx_queue *tx_queue)
25 	struct efx_nic *efx = tx_queue->efx;
32 	tx_queue->ptr_mask = entries - 1;
36 		  tx_queue->queue, efx->txq_entries, tx_queue->ptr_mask);
39 	tx_queue->buffer = kcalloc(entries, sizeof(*tx_queue->buffer),
41 	if (!tx_queue->buffer)
44 	tx_queue->cb_page = kcalloc(efx_tx_cb_page_count(tx_queue),
45 				    sizeof(tx_queue->cb_page[0]), GFP_KERNEL);
46 	if (!tx_queue->cb_page) {
52 	rc = efx_nic_probe_tx(tx_queue);
56 	tx_queue->channel->tx_queue_by_type[tx_queue->type] = tx_queue;
60 	kfree(tx_queue->cb_page);
61 	tx_queue->cb_page = NULL;
63 	kfree(tx_queue->buffer);
64 	tx_queue->buffer = NULL;
68 void efx_init_tx_queue(struct efx_tx_queue *tx_queue)
70 	struct efx_nic *efx = tx_queue->efx;
73 		  "initialising TX queue %d\n", tx_queue->queue);
75 	tx_queue->insert_count = 0;
76 	tx_queue->notify_count = 0;
77 	tx_queue->write_count = 0;
78 	tx_queue->packet_write_count = 0;
79 	tx_queue->old_write_count = 0;
80 	tx_queue->read_count = 0;
81 	tx_queue->old_read_count = 0;
82 	tx_queue->empty_read_count = 0 | EFX_EMPTY_COUNT_VALID;
83 	tx_queue->xmit_pending = false;
84 	tx_queue->timestamping = (efx_ptp_use_mac_tx_timestamps(efx) &&
85 				  tx_queue->channel == efx_ptp_channel(efx));
86 	tx_queue->completed_timestamp_major = 0;
87 	tx_queue->completed_timestamp_minor = 0;
89 	tx_queue->xdp_tx = efx_channel_is_xdp_tx(tx_queue->channel);
90 	tx_queue->tso_version = 0;
93 	efx_nic_init_tx(tx_queue);
95 	tx_queue->initialised = true;
98 void efx_fini_tx_queue(struct efx_tx_queue *tx_queue)
102 	netif_dbg(tx_queue->efx, drv, tx_queue->efx->net_dev,
103 		  "shutting down TX queue %d\n", tx_queue->queue);
105 	tx_queue->initialised = false;
107 	if (!tx_queue->buffer)
111 	while (tx_queue->read_count != tx_queue->write_count) {
115 		buffer = &tx_queue->buffer[tx_queue->read_count & tx_queue->ptr_mask];
116 		efx_dequeue_buffer(tx_queue, buffer, &pkts_compl, &bytes_compl,
119 		++tx_queue->read_count;
121 	tx_queue->xmit_pending = false;
122 	netdev_tx_reset_queue(tx_queue->core_txq);
125 void efx_remove_tx_queue(struct efx_tx_queue *tx_queue)
129 	if (!tx_queue->buffer)
132 	netif_dbg(tx_queue->efx, drv, tx_queue->efx->net_dev,
133 		  "destroying TX queue %d\n", tx_queue->queue);
134 	efx_nic_remove_tx(tx_queue);
136 	if (tx_queue->cb_page) {
137 		for (i = 0; i < efx_tx_cb_page_count(tx_queue); i++)
138 			efx_nic_free_buffer(tx_queue->efx,
139 					    &tx_queue->cb_page[i]);
140 		kfree(tx_queue->cb_page);
141 		tx_queue->cb_page = NULL;
144 	kfree(tx_queue->buffer);
145 	tx_queue->buffer = NULL;
146 	tx_queue->channel->tx_queue_by_type[tx_queue->type] = NULL;
149 void efx_dequeue_buffer(struct efx_tx_queue *tx_queue,
156 		struct device *dma_dev = &tx_queue->efx->pci_dev->dev;
180 		if (tx_queue->timestamping &&
181 		    (tx_queue->completed_timestamp_major ||
182 		     tx_queue->completed_timestamp_minor)) {
186 				efx_ptp_nic_to_kernel_time(tx_queue);
189 			tx_queue->completed_timestamp_major = 0;
190 			tx_queue->completed_timestamp_minor = 0;
193 		netif_vdbg(tx_queue->efx, tx_done, tx_queue->efx->net_dev,
195 			   tx_queue->queue, tx_queue->read_count);
209 static void efx_dequeue_buffers(struct efx_tx_queue *tx_queue,
215 	struct efx_nic *efx = tx_queue->efx;
218 	stop_index = (index + 1) & tx_queue->ptr_mask;
219 	read_ptr = tx_queue->read_count & tx_queue->ptr_mask;
222 		struct efx_tx_buffer *buffer = &tx_queue->buffer[read_ptr];
227 				  tx_queue->queue, read_ptr);
232 		efx_dequeue_buffer(tx_queue, buffer, pkts_compl, bytes_compl,
235 		++tx_queue->read_count;
236 		read_ptr = tx_queue->read_count & tx_queue->ptr_mask;
240 void efx_xmit_done_check_empty(struct efx_tx_queue *tx_queue)
242 	if ((int)(tx_queue->read_count - tx_queue->old_write_count) >= 0) {
243 		tx_queue->old_write_count = READ_ONCE(tx_queue->write_count);
244 		if (tx_queue->read_count == tx_queue->old_write_count) {
247 			tx_queue->empty_read_count =
248 				tx_queue->read_count | EFX_EMPTY_COUNT_VALID;
253 int efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index)
257 	struct efx_nic *efx = tx_queue->efx;
259 	EFX_WARN_ON_ONCE_PARANOID(index > tx_queue->ptr_mask);
261 	efx_dequeue_buffers(tx_queue, index, &pkts_compl, &bytes_compl,
263 	tx_queue->pkts_compl += pkts_compl;
264 	tx_queue->bytes_compl += bytes_compl;
267 		++tx_queue->merge_events;
274 	if (unlikely(netif_tx_queue_stopped(tx_queue->core_txq)) &&
277 		fill_level = efx_channel_tx_fill_level(tx_queue->channel);
279 			netif_tx_wake_queue(tx_queue->core_txq);
282 	efx_xmit_done_check_empty(tx_queue);
287 /* Remove buffers put into a tx_queue for the current packet.
290 void efx_enqueue_unwind(struct efx_tx_queue *tx_queue,
299 	while (tx_queue->insert_count != insert_count) {
300 		--tx_queue->insert_count;
301 		buffer = __efx_tx_queue_get_insert_buffer(tx_queue);
302 		efx_dequeue_buffer(tx_queue, buffer, &pkts_compl, &bytes_compl,
307 struct efx_tx_buffer *efx_tx_map_chunk(struct efx_tx_queue *tx_queue,
310 	const struct efx_nic_type *nic_type = tx_queue->efx->type;
316 		buffer = efx_tx_queue_get_insert_buffer(tx_queue);
319 			dma_len = nic_type->tx_limit_len(tx_queue, dma_addr, len);
328 		++tx_queue->insert_count;
348 int efx_tx_map_data(struct efx_tx_queue *tx_queue, struct sk_buff *skb,
351 	struct efx_nic *efx = tx_queue->efx;
378 			tx_queue->tso_long_headers++;
379 			efx_tx_map_chunk(tx_queue, dma_addr, header_len);
390 		buffer = efx_tx_map_chunk(tx_queue, dma_addr, len);
451 int efx_tx_tso_fallback(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
463 		efx_enqueue_skb(tx_queue, skb);