diff options
Diffstat (limited to 'drivers/net/ethernet/sfc/tx.c')
-rw-r--r-- | drivers/net/ethernet/sfc/tx.c | 398 |
1 files changed, 3 insertions, 395 deletions
diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c index 00c1c4402451..04d7f41d7ed9 100644 --- a/drivers/net/ethernet/sfc/tx.c +++ b/drivers/net/ethernet/sfc/tx.c @@ -20,6 +20,7 @@ #include "io.h" #include "nic.h" #include "tx.h" +#include "tx_common.h" #include "workarounds.h" #include "ef10_regs.h" @@ -56,72 +57,6 @@ u8 *efx_tx_get_copy_buffer_limited(struct efx_tx_queue *tx_queue, return efx_tx_get_copy_buffer(tx_queue, buffer); } -static void efx_dequeue_buffer(struct efx_tx_queue *tx_queue, - struct efx_tx_buffer *buffer, - unsigned int *pkts_compl, - unsigned int *bytes_compl) -{ - if (buffer->unmap_len) { - struct device *dma_dev = &tx_queue->efx->pci_dev->dev; - dma_addr_t unmap_addr = buffer->dma_addr - buffer->dma_offset; - if (buffer->flags & EFX_TX_BUF_MAP_SINGLE) - dma_unmap_single(dma_dev, unmap_addr, buffer->unmap_len, - DMA_TO_DEVICE); - else - dma_unmap_page(dma_dev, unmap_addr, buffer->unmap_len, - DMA_TO_DEVICE); - buffer->unmap_len = 0; - } - - if (buffer->flags & EFX_TX_BUF_SKB) { - struct sk_buff *skb = (struct sk_buff *)buffer->skb; - - EFX_WARN_ON_PARANOID(!pkts_compl || !bytes_compl); - (*pkts_compl)++; - (*bytes_compl) += skb->len; - if (tx_queue->timestamping && - (tx_queue->completed_timestamp_major || - tx_queue->completed_timestamp_minor)) { - struct skb_shared_hwtstamps hwtstamp; - - hwtstamp.hwtstamp = - efx_ptp_nic_to_kernel_time(tx_queue); - skb_tstamp_tx(skb, &hwtstamp); - - tx_queue->completed_timestamp_major = 0; - tx_queue->completed_timestamp_minor = 0; - } - dev_consume_skb_any((struct sk_buff *)buffer->skb); - netif_vdbg(tx_queue->efx, tx_done, tx_queue->efx->net_dev, - "TX queue %d transmission id %x complete\n", - tx_queue->queue, tx_queue->read_count); - } else if (buffer->flags & EFX_TX_BUF_XDP) { - xdp_return_frame_rx_napi(buffer->xdpf); - } - - buffer->len = 0; - buffer->flags = 0; -} - -unsigned int efx_tx_max_skb_descs(struct efx_nic *efx) -{ - /* Header and payload descriptor for each output segment, plus - * one for every input fragment boundary within a segment - */ - unsigned int max_descs = EFX_TSO_MAX_SEGS * 2 + MAX_SKB_FRAGS; - - /* Possibly one more per segment for option descriptors */ - if (efx_nic_rev(efx) >= EFX_REV_HUNT_A0) - max_descs += EFX_TSO_MAX_SEGS; - - /* Possibly more for PCIe page boundaries within input fragments */ - if (PAGE_SIZE > EFX_PAGE_SIZE) - max_descs += max_t(unsigned int, MAX_SKB_FRAGS, - DIV_ROUND_UP(GSO_MAX_SIZE, EFX_PAGE_SIZE)); - - return max_descs; -} - static void efx_tx_maybe_stop_queue(struct efx_tx_queue *txq1) { /* We need to consider both queues that the net core sees as one */ @@ -333,125 +268,6 @@ static int efx_enqueue_skb_pio(struct efx_tx_queue *tx_queue, } #endif /* EFX_USE_PIO */ -static struct efx_tx_buffer *efx_tx_map_chunk(struct efx_tx_queue *tx_queue, - dma_addr_t dma_addr, - size_t len) -{ - const struct efx_nic_type *nic_type = tx_queue->efx->type; - struct efx_tx_buffer *buffer; - unsigned int dma_len; - - /* Map the fragment taking account of NIC-dependent DMA limits. */ - do { - buffer = efx_tx_queue_get_insert_buffer(tx_queue); - dma_len = nic_type->tx_limit_len(tx_queue, dma_addr, len); - - buffer->len = dma_len; - buffer->dma_addr = dma_addr; - buffer->flags = EFX_TX_BUF_CONT; - len -= dma_len; - dma_addr += dma_len; - ++tx_queue->insert_count; - } while (len); - - return buffer; -} - -/* Map all data from an SKB for DMA and create descriptors on the queue. - */ -static int efx_tx_map_data(struct efx_tx_queue *tx_queue, struct sk_buff *skb, - unsigned int segment_count) -{ - struct efx_nic *efx = tx_queue->efx; - struct device *dma_dev = &efx->pci_dev->dev; - unsigned int frag_index, nr_frags; - dma_addr_t dma_addr, unmap_addr; - unsigned short dma_flags; - size_t len, unmap_len; - - nr_frags = skb_shinfo(skb)->nr_frags; - frag_index = 0; - - /* Map header data. */ - len = skb_headlen(skb); - dma_addr = dma_map_single(dma_dev, skb->data, len, DMA_TO_DEVICE); - dma_flags = EFX_TX_BUF_MAP_SINGLE; - unmap_len = len; - unmap_addr = dma_addr; - - if (unlikely(dma_mapping_error(dma_dev, dma_addr))) - return -EIO; - - if (segment_count) { - /* For TSO we need to put the header in to a separate - * descriptor. Map this separately if necessary. - */ - size_t header_len = skb_transport_header(skb) - skb->data + - (tcp_hdr(skb)->doff << 2u); - - if (header_len != len) { - tx_queue->tso_long_headers++; - efx_tx_map_chunk(tx_queue, dma_addr, header_len); - len -= header_len; - dma_addr += header_len; - } - } - - /* Add descriptors for each fragment. */ - do { - struct efx_tx_buffer *buffer; - skb_frag_t *fragment; - - buffer = efx_tx_map_chunk(tx_queue, dma_addr, len); - - /* The final descriptor for a fragment is responsible for - * unmapping the whole fragment. - */ - buffer->flags = EFX_TX_BUF_CONT | dma_flags; - buffer->unmap_len = unmap_len; - buffer->dma_offset = buffer->dma_addr - unmap_addr; - - if (frag_index >= nr_frags) { - /* Store SKB details with the final buffer for - * the completion. - */ - buffer->skb = skb; - buffer->flags = EFX_TX_BUF_SKB | dma_flags; - return 0; - } - - /* Move on to the next fragment. */ - fragment = &skb_shinfo(skb)->frags[frag_index++]; - len = skb_frag_size(fragment); - dma_addr = skb_frag_dma_map(dma_dev, fragment, - 0, len, DMA_TO_DEVICE); - dma_flags = 0; - unmap_len = len; - unmap_addr = dma_addr; - - if (unlikely(dma_mapping_error(dma_dev, dma_addr))) - return -EIO; - } while (1); -} - -/* Remove buffers put into a tx_queue for the current packet. - * None of the buffers must have an skb attached. - */ -static void efx_enqueue_unwind(struct efx_tx_queue *tx_queue, - unsigned int insert_count) -{ - struct efx_tx_buffer *buffer; - unsigned int bytes_compl = 0; - unsigned int pkts_compl = 0; - - /* Work backwards until we hit the original insert pointer value */ - while (tx_queue->insert_count != insert_count) { - --tx_queue->insert_count; - buffer = __efx_tx_queue_get_insert_buffer(tx_queue); - efx_dequeue_buffer(tx_queue, buffer, &pkts_compl, &bytes_compl); - } -} - /* * Fallback to software TSO. * @@ -473,12 +289,9 @@ static int efx_tx_tso_fallback(struct efx_tx_queue *tx_queue, dev_consume_skb_any(skb); skb = segments; - while (skb) { - next = skb->next; - skb->next = NULL; - + skb_list_walk_safe(skb, skb, next) { + skb_mark_not_on_list(skb); efx_enqueue_skb(tx_queue, skb); - skb = next; } return 0; @@ -687,41 +500,6 @@ int efx_xdp_tx_buffers(struct efx_nic *efx, int n, struct xdp_frame **xdpfs, return i; } -/* Remove packets from the TX queue - * - * This removes packets from the TX queue, up to and including the - * specified index. - */ -static void efx_dequeue_buffers(struct efx_tx_queue *tx_queue, - unsigned int index, - unsigned int *pkts_compl, - unsigned int *bytes_compl) -{ - struct efx_nic *efx = tx_queue->efx; - unsigned int stop_index, read_ptr; - - stop_index = (index + 1) & tx_queue->ptr_mask; - read_ptr = tx_queue->read_count & tx_queue->ptr_mask; - - while (read_ptr != stop_index) { - struct efx_tx_buffer *buffer = &tx_queue->buffer[read_ptr]; - - if (!(buffer->flags & EFX_TX_BUF_OPTION) && - unlikely(buffer->len == 0)) { - netif_err(efx, tx_err, efx->net_dev, - "TX queue %d spurious TX completion id %x\n", - tx_queue->queue, read_ptr); - efx_schedule_reset(efx, RESET_TYPE_TX_SKIP); - return; - } - - efx_dequeue_buffer(tx_queue, buffer, pkts_compl, bytes_compl); - - ++tx_queue->read_count; - read_ptr = tx_queue->read_count & tx_queue->ptr_mask; - } -} - /* Initiate a packet transmission. We use one channel per CPU * (sharing when we have more CPUs than channels). On Falcon, the TX * completion events will be directed back to the CPU that transmitted @@ -834,173 +612,3 @@ int efx_setup_tc(struct net_device *net_dev, enum tc_setup_type type, net_dev->num_tc = num_tc; return 0; } - -void efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index) -{ - unsigned fill_level; - struct efx_nic *efx = tx_queue->efx; - struct efx_tx_queue *txq2; - unsigned int pkts_compl = 0, bytes_compl = 0; - - EFX_WARN_ON_ONCE_PARANOID(index > tx_queue->ptr_mask); - - efx_dequeue_buffers(tx_queue, index, &pkts_compl, &bytes_compl); - tx_queue->pkts_compl += pkts_compl; - tx_queue->bytes_compl += bytes_compl; - - if (pkts_compl > 1) - ++tx_queue->merge_events; - - /* See if we need to restart the netif queue. This memory - * barrier ensures that we write read_count (inside - * efx_dequeue_buffers()) before reading the queue status. - */ - smp_mb(); - if (unlikely(netif_tx_queue_stopped(tx_queue->core_txq)) && - likely(efx->port_enabled) && - likely(netif_device_present(efx->net_dev))) { - txq2 = efx_tx_queue_partner(tx_queue); - fill_level = max(tx_queue->insert_count - tx_queue->read_count, - txq2->insert_count - txq2->read_count); - if (fill_level <= efx->txq_wake_thresh) - netif_tx_wake_queue(tx_queue->core_txq); - } - - /* Check whether the hardware queue is now empty */ - if ((int)(tx_queue->read_count - tx_queue->old_write_count) >= 0) { - tx_queue->old_write_count = READ_ONCE(tx_queue->write_count); - if (tx_queue->read_count == tx_queue->old_write_count) { - smp_mb(); - tx_queue->empty_read_count = - tx_queue->read_count | EFX_EMPTY_COUNT_VALID; - } - } -} - -static unsigned int efx_tx_cb_page_count(struct efx_tx_queue *tx_queue) -{ - return DIV_ROUND_UP(tx_queue->ptr_mask + 1, PAGE_SIZE >> EFX_TX_CB_ORDER); -} - -int efx_probe_tx_queue(struct efx_tx_queue *tx_queue) -{ - struct efx_nic *efx = tx_queue->efx; - unsigned int entries; - int rc; - - /* Create the smallest power-of-two aligned ring */ - entries = max(roundup_pow_of_two(efx->txq_entries), EFX_MIN_DMAQ_SIZE); - EFX_WARN_ON_PARANOID(entries > EFX_MAX_DMAQ_SIZE); - tx_queue->ptr_mask = entries - 1; - - netif_dbg(efx, probe, efx->net_dev, - "creating TX queue %d size %#x mask %#x\n", - tx_queue->queue, efx->txq_entries, tx_queue->ptr_mask); - - /* Allocate software ring */ - tx_queue->buffer = kcalloc(entries, sizeof(*tx_queue->buffer), - GFP_KERNEL); - if (!tx_queue->buffer) - return -ENOMEM; - - tx_queue->cb_page = kcalloc(efx_tx_cb_page_count(tx_queue), - sizeof(tx_queue->cb_page[0]), GFP_KERNEL); - if (!tx_queue->cb_page) { - rc = -ENOMEM; - goto fail1; - } - - /* Allocate hardware ring */ - rc = efx_nic_probe_tx(tx_queue); - if (rc) - goto fail2; - - return 0; - -fail2: - kfree(tx_queue->cb_page); - tx_queue->cb_page = NULL; -fail1: - kfree(tx_queue->buffer); - tx_queue->buffer = NULL; - return rc; -} - -void efx_init_tx_queue(struct efx_tx_queue *tx_queue) -{ - struct efx_nic *efx = tx_queue->efx; - - netif_dbg(efx, drv, efx->net_dev, - "initialising TX queue %d\n", tx_queue->queue); - - tx_queue->insert_count = 0; - tx_queue->write_count = 0; - tx_queue->packet_write_count = 0; - tx_queue->old_write_count = 0; - tx_queue->read_count = 0; - tx_queue->old_read_count = 0; - tx_queue->empty_read_count = 0 | EFX_EMPTY_COUNT_VALID; - tx_queue->xmit_more_available = false; - tx_queue->timestamping = (efx_ptp_use_mac_tx_timestamps(efx) && - tx_queue->channel == efx_ptp_channel(efx)); - tx_queue->completed_desc_ptr = tx_queue->ptr_mask; - tx_queue->completed_timestamp_major = 0; - tx_queue->completed_timestamp_minor = 0; - - tx_queue->xdp_tx = efx_channel_is_xdp_tx(tx_queue->channel); - - /* Set up default function pointers. These may get replaced by - * efx_nic_init_tx() based off NIC/queue capabilities. - */ - tx_queue->handle_tso = efx_enqueue_skb_tso; - - /* Set up TX descriptor ring */ - efx_nic_init_tx(tx_queue); - - tx_queue->initialised = true; -} - -void efx_fini_tx_queue(struct efx_tx_queue *tx_queue) -{ - struct efx_tx_buffer *buffer; - - netif_dbg(tx_queue->efx, drv, tx_queue->efx->net_dev, - "shutting down TX queue %d\n", tx_queue->queue); - - if (!tx_queue->buffer) - return; - - /* Free any buffers left in the ring */ - while (tx_queue->read_count != tx_queue->write_count) { - unsigned int pkts_compl = 0, bytes_compl = 0; - buffer = &tx_queue->buffer[tx_queue->read_count & tx_queue->ptr_mask]; - efx_dequeue_buffer(tx_queue, buffer, &pkts_compl, &bytes_compl); - - ++tx_queue->read_count; - } - tx_queue->xmit_more_available = false; - netdev_tx_reset_queue(tx_queue->core_txq); -} - -void efx_remove_tx_queue(struct efx_tx_queue *tx_queue) -{ - int i; - - if (!tx_queue->buffer) - return; - - netif_dbg(tx_queue->efx, drv, tx_queue->efx->net_dev, - "destroying TX queue %d\n", tx_queue->queue); - efx_nic_remove_tx(tx_queue); - - if (tx_queue->cb_page) { - for (i = 0; i < efx_tx_cb_page_count(tx_queue); i++) - efx_nic_free_buffer(tx_queue->efx, - &tx_queue->cb_page[i]); - kfree(tx_queue->cb_page); - tx_queue->cb_page = NULL; - } - - kfree(tx_queue->buffer); - tx_queue->buffer = NULL; -} |