Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 1 | /**************************************************************************** |
| 2 | * Driver for Solarflare Solarstorm network controllers and boards |
| 3 | * Copyright 2005-2006 Fen Systems Ltd. |
Ben Hutchings | 0a6f40c | 2011-02-25 00:01:34 +0000 | [diff] [blame] | 4 | * Copyright 2005-2010 Solarflare Communications Inc. |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License version 2 as published |
| 8 | * by the Free Software Foundation, incorporated herein by reference. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/pci.h> |
| 12 | #include <linux/tcp.h> |
| 13 | #include <linux/ip.h> |
| 14 | #include <linux/in.h> |
Ben Hutchings | 738a8f4 | 2009-11-29 15:16:05 +0000 | [diff] [blame] | 15 | #include <linux/ipv6.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 16 | #include <linux/slab.h> |
Ben Hutchings | 738a8f4 | 2009-11-29 15:16:05 +0000 | [diff] [blame] | 17 | #include <net/ipv6.h> |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 18 | #include <linux/if_ether.h> |
| 19 | #include <linux/highmem.h> |
| 20 | #include "net_driver.h" |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 21 | #include "efx.h" |
Ben Hutchings | 744093c | 2009-11-29 15:12:08 +0000 | [diff] [blame] | 22 | #include "nic.h" |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 23 | #include "workarounds.h" |
| 24 | |
| 25 | /* |
| 26 | * TX descriptor ring full threshold |
| 27 | * |
| 28 | * The tx_queue descriptor ring fill-level must fall below this value |
| 29 | * before we restart the netif queue |
| 30 | */ |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 31 | #define EFX_TXQ_THRESHOLD(_efx) ((_efx)->txq_entries / 2u) |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 32 | |
Ben Hutchings | 4d56606 | 2008-09-01 12:47:12 +0100 | [diff] [blame] | 33 | static void efx_dequeue_buffer(struct efx_tx_queue *tx_queue, |
| 34 | struct efx_tx_buffer *buffer) |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 35 | { |
| 36 | if (buffer->unmap_len) { |
| 37 | struct pci_dev *pci_dev = tx_queue->efx->pci_dev; |
Ben Hutchings | cc12dac | 2008-09-01 12:46:43 +0100 | [diff] [blame] | 38 | dma_addr_t unmap_addr = (buffer->dma_addr + buffer->len - |
| 39 | buffer->unmap_len); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 40 | if (buffer->unmap_single) |
Ben Hutchings | cc12dac | 2008-09-01 12:46:43 +0100 | [diff] [blame] | 41 | pci_unmap_single(pci_dev, unmap_addr, buffer->unmap_len, |
| 42 | PCI_DMA_TODEVICE); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 43 | else |
Ben Hutchings | cc12dac | 2008-09-01 12:46:43 +0100 | [diff] [blame] | 44 | pci_unmap_page(pci_dev, unmap_addr, buffer->unmap_len, |
| 45 | PCI_DMA_TODEVICE); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 46 | buffer->unmap_len = 0; |
Ben Hutchings | dc8cfa5 | 2008-09-01 12:46:50 +0100 | [diff] [blame] | 47 | buffer->unmap_single = false; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 48 | } |
| 49 | |
| 50 | if (buffer->skb) { |
| 51 | dev_kfree_skb_any((struct sk_buff *) buffer->skb); |
| 52 | buffer->skb = NULL; |
Ben Hutchings | 62776d0 | 2010-06-23 11:30:07 +0000 | [diff] [blame] | 53 | netif_vdbg(tx_queue->efx, tx_done, tx_queue->efx->net_dev, |
| 54 | "TX queue %d transmission id %x complete\n", |
| 55 | tx_queue->queue, tx_queue->read_count); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 56 | } |
| 57 | } |
| 58 | |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 59 | /** |
| 60 | * struct efx_tso_header - a DMA mapped buffer for packet headers |
| 61 | * @next: Linked list of free ones. |
| 62 | * The list is protected by the TX queue lock. |
| 63 | * @dma_unmap_len: Length to unmap for an oversize buffer, or 0. |
| 64 | * @dma_addr: The DMA address of the header below. |
| 65 | * |
| 66 | * This controls the memory used for a TSO header. Use TSOH_DATA() |
| 67 | * to find the packet header data. Use TSOH_SIZE() to calculate the |
| 68 | * total size required for a given packet header length. TSO headers |
| 69 | * in the free list are exactly %TSOH_STD_SIZE bytes in size. |
| 70 | */ |
| 71 | struct efx_tso_header { |
| 72 | union { |
| 73 | struct efx_tso_header *next; |
| 74 | size_t unmap_len; |
| 75 | }; |
| 76 | dma_addr_t dma_addr; |
| 77 | }; |
| 78 | |
| 79 | static int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue, |
Ben Hutchings | 740847d | 2008-09-01 12:48:23 +0100 | [diff] [blame] | 80 | struct sk_buff *skb); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 81 | static void efx_fini_tso(struct efx_tx_queue *tx_queue); |
| 82 | static void efx_tsoh_heap_free(struct efx_tx_queue *tx_queue, |
| 83 | struct efx_tso_header *tsoh); |
| 84 | |
Ben Hutchings | 4d56606 | 2008-09-01 12:47:12 +0100 | [diff] [blame] | 85 | static void efx_tsoh_free(struct efx_tx_queue *tx_queue, |
| 86 | struct efx_tx_buffer *buffer) |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 87 | { |
| 88 | if (buffer->tsoh) { |
| 89 | if (likely(!buffer->tsoh->unmap_len)) { |
| 90 | buffer->tsoh->next = tx_queue->tso_headers_free; |
| 91 | tx_queue->tso_headers_free = buffer->tsoh; |
| 92 | } else { |
| 93 | efx_tsoh_heap_free(tx_queue, buffer->tsoh); |
| 94 | } |
| 95 | buffer->tsoh = NULL; |
| 96 | } |
| 97 | } |
| 98 | |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 99 | |
Ben Hutchings | 63f1988 | 2009-10-23 08:31:20 +0000 | [diff] [blame] | 100 | static inline unsigned |
| 101 | efx_max_tx_len(struct efx_nic *efx, dma_addr_t dma_addr) |
| 102 | { |
| 103 | /* Depending on the NIC revision, we can use descriptor |
| 104 | * lengths up to 8K or 8K-1. However, since PCI Express |
| 105 | * devices must split read requests at 4K boundaries, there is |
| 106 | * little benefit from using descriptors that cross those |
| 107 | * boundaries and we keep things simple by not doing so. |
| 108 | */ |
| 109 | unsigned len = (~dma_addr & 0xfff) + 1; |
| 110 | |
| 111 | /* Work around hardware bug for unaligned buffers. */ |
| 112 | if (EFX_WORKAROUND_5391(efx) && (dma_addr & 0xf)) |
| 113 | len = min_t(unsigned, len, 512 - (dma_addr & 0xf)); |
| 114 | |
| 115 | return len; |
| 116 | } |
| 117 | |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 118 | /* |
| 119 | * Add a socket buffer to a TX queue |
| 120 | * |
| 121 | * This maps all fragments of a socket buffer for DMA and adds them to |
| 122 | * the TX queue. The queue's insert pointer will be incremented by |
| 123 | * the number of fragments in the socket buffer. |
| 124 | * |
| 125 | * If any DMA mapping fails, any mapped fragments will be unmapped, |
| 126 | * the queue's insert pointer will be restored to its original value. |
| 127 | * |
Ben Hutchings | 497f5ba | 2009-11-23 16:07:05 +0000 | [diff] [blame] | 128 | * This function is split out from efx_hard_start_xmit to allow the |
| 129 | * loopback test to direct packets via specific TX queues. |
| 130 | * |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 131 | * Returns NETDEV_TX_OK or NETDEV_TX_BUSY |
| 132 | * You must hold netif_tx_lock() to call this function. |
| 133 | */ |
Ben Hutchings | 497f5ba | 2009-11-23 16:07:05 +0000 | [diff] [blame] | 134 | netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb) |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 135 | { |
| 136 | struct efx_nic *efx = tx_queue->efx; |
| 137 | struct pci_dev *pci_dev = efx->pci_dev; |
| 138 | struct efx_tx_buffer *buffer; |
| 139 | skb_frag_t *fragment; |
| 140 | struct page *page; |
| 141 | int page_offset; |
Ben Hutchings | 63f1988 | 2009-10-23 08:31:20 +0000 | [diff] [blame] | 142 | unsigned int len, unmap_len = 0, fill_level, insert_ptr; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 143 | dma_addr_t dma_addr, unmap_addr = 0; |
| 144 | unsigned int dma_len; |
Ben Hutchings | dc8cfa5 | 2008-09-01 12:46:50 +0100 | [diff] [blame] | 145 | bool unmap_single; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 146 | int q_space, i = 0; |
Stephen Hemminger | 61357325 | 2009-08-31 19:50:58 +0000 | [diff] [blame] | 147 | netdev_tx_t rc = NETDEV_TX_OK; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 148 | |
| 149 | EFX_BUG_ON_PARANOID(tx_queue->write_count != tx_queue->insert_count); |
| 150 | |
Ben Hutchings | 9bc183d | 2009-11-23 16:06:47 +0000 | [diff] [blame] | 151 | if (skb_shinfo(skb)->gso_size) |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 152 | return efx_enqueue_skb_tso(tx_queue, skb); |
| 153 | |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 154 | /* Get size of the initial fragment */ |
| 155 | len = skb_headlen(skb); |
| 156 | |
Ben Hutchings | bb145a9 | 2009-03-20 13:25:39 +0000 | [diff] [blame] | 157 | /* Pad if necessary */ |
| 158 | if (EFX_WORKAROUND_15592(efx) && skb->len <= 32) { |
| 159 | EFX_BUG_ON_PARANOID(skb->data_len); |
| 160 | len = 32 + 1; |
| 161 | if (skb_pad(skb, len - skb->len)) |
| 162 | return NETDEV_TX_OK; |
| 163 | } |
| 164 | |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 165 | fill_level = tx_queue->insert_count - tx_queue->old_read_count; |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 166 | q_space = efx->txq_entries - 1 - fill_level; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 167 | |
| 168 | /* Map for DMA. Use pci_map_single rather than pci_map_page |
| 169 | * since this is more efficient on machines with sparse |
| 170 | * memory. |
| 171 | */ |
Ben Hutchings | dc8cfa5 | 2008-09-01 12:46:50 +0100 | [diff] [blame] | 172 | unmap_single = true; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 173 | dma_addr = pci_map_single(pci_dev, skb->data, len, PCI_DMA_TODEVICE); |
| 174 | |
| 175 | /* Process all fragments */ |
| 176 | while (1) { |
FUJITA Tomonori | 8d8bb39 | 2008-07-25 19:44:49 -0700 | [diff] [blame] | 177 | if (unlikely(pci_dma_mapping_error(pci_dev, dma_addr))) |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 178 | goto pci_err; |
| 179 | |
| 180 | /* Store fields for marking in the per-fragment final |
| 181 | * descriptor */ |
| 182 | unmap_len = len; |
| 183 | unmap_addr = dma_addr; |
| 184 | |
| 185 | /* Add to TX queue, splitting across DMA boundaries */ |
| 186 | do { |
| 187 | if (unlikely(q_space-- <= 0)) { |
| 188 | /* It might be that completions have |
| 189 | * happened since the xmit path last |
| 190 | * checked. Update the xmit path's |
| 191 | * copy of read_count. |
| 192 | */ |
Ben Hutchings | c04bfc6 | 2010-12-10 01:24:16 +0000 | [diff] [blame] | 193 | netif_tx_stop_queue(tx_queue->core_txq); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 194 | /* This memory barrier protects the |
Ben Hutchings | c04bfc6 | 2010-12-10 01:24:16 +0000 | [diff] [blame] | 195 | * change of queue state from the access |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 196 | * of read_count. */ |
| 197 | smp_mb(); |
| 198 | tx_queue->old_read_count = |
Ben Hutchings | 51c56f4 | 2010-11-10 18:46:40 +0000 | [diff] [blame] | 199 | ACCESS_ONCE(tx_queue->read_count); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 200 | fill_level = (tx_queue->insert_count |
| 201 | - tx_queue->old_read_count); |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 202 | q_space = efx->txq_entries - 1 - fill_level; |
Ben Hutchings | c04bfc6 | 2010-12-10 01:24:16 +0000 | [diff] [blame] | 203 | if (unlikely(q_space-- <= 0)) { |
| 204 | rc = NETDEV_TX_BUSY; |
| 205 | goto unwind; |
| 206 | } |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 207 | smp_mb(); |
Ben Hutchings | c04bfc6 | 2010-12-10 01:24:16 +0000 | [diff] [blame] | 208 | netif_tx_start_queue(tx_queue->core_txq); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 209 | } |
| 210 | |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 211 | insert_ptr = tx_queue->insert_count & tx_queue->ptr_mask; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 212 | buffer = &tx_queue->buffer[insert_ptr]; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 213 | efx_tsoh_free(tx_queue, buffer); |
| 214 | EFX_BUG_ON_PARANOID(buffer->tsoh); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 215 | EFX_BUG_ON_PARANOID(buffer->skb); |
| 216 | EFX_BUG_ON_PARANOID(buffer->len); |
Ben Hutchings | dc8cfa5 | 2008-09-01 12:46:50 +0100 | [diff] [blame] | 217 | EFX_BUG_ON_PARANOID(!buffer->continuation); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 218 | EFX_BUG_ON_PARANOID(buffer->unmap_len); |
| 219 | |
Ben Hutchings | 63f1988 | 2009-10-23 08:31:20 +0000 | [diff] [blame] | 220 | dma_len = efx_max_tx_len(efx, dma_addr); |
| 221 | if (likely(dma_len >= len)) |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 222 | dma_len = len; |
| 223 | |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 224 | /* Fill out per descriptor fields */ |
| 225 | buffer->len = dma_len; |
| 226 | buffer->dma_addr = dma_addr; |
| 227 | len -= dma_len; |
| 228 | dma_addr += dma_len; |
| 229 | ++tx_queue->insert_count; |
| 230 | } while (len); |
| 231 | |
| 232 | /* Transfer ownership of the unmapping to the final buffer */ |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 233 | buffer->unmap_single = unmap_single; |
| 234 | buffer->unmap_len = unmap_len; |
| 235 | unmap_len = 0; |
| 236 | |
| 237 | /* Get address and size of next fragment */ |
| 238 | if (i >= skb_shinfo(skb)->nr_frags) |
| 239 | break; |
| 240 | fragment = &skb_shinfo(skb)->frags[i]; |
| 241 | len = fragment->size; |
| 242 | page = fragment->page; |
| 243 | page_offset = fragment->page_offset; |
| 244 | i++; |
| 245 | /* Map for DMA */ |
Ben Hutchings | dc8cfa5 | 2008-09-01 12:46:50 +0100 | [diff] [blame] | 246 | unmap_single = false; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 247 | dma_addr = pci_map_page(pci_dev, page, page_offset, len, |
| 248 | PCI_DMA_TODEVICE); |
| 249 | } |
| 250 | |
| 251 | /* Transfer ownership of the skb to the final buffer */ |
| 252 | buffer->skb = skb; |
Ben Hutchings | dc8cfa5 | 2008-09-01 12:46:50 +0100 | [diff] [blame] | 253 | buffer->continuation = false; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 254 | |
| 255 | /* Pass off to hardware */ |
Ben Hutchings | 152b6a6 | 2009-11-29 03:43:56 +0000 | [diff] [blame] | 256 | efx_nic_push_buffers(tx_queue); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 257 | |
| 258 | return NETDEV_TX_OK; |
| 259 | |
| 260 | pci_err: |
Ben Hutchings | 62776d0 | 2010-06-23 11:30:07 +0000 | [diff] [blame] | 261 | netif_err(efx, tx_err, efx->net_dev, |
| 262 | " TX queue %d could not map skb with %d bytes %d " |
| 263 | "fragments for DMA\n", tx_queue->queue, skb->len, |
| 264 | skb_shinfo(skb)->nr_frags + 1); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 265 | |
| 266 | /* Mark the packet as transmitted, and free the SKB ourselves */ |
Ben Hutchings | 9bc183d | 2009-11-23 16:06:47 +0000 | [diff] [blame] | 267 | dev_kfree_skb_any(skb); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 268 | |
| 269 | unwind: |
| 270 | /* Work backwards until we hit the original insert pointer value */ |
| 271 | while (tx_queue->insert_count != tx_queue->write_count) { |
| 272 | --tx_queue->insert_count; |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 273 | insert_ptr = tx_queue->insert_count & tx_queue->ptr_mask; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 274 | buffer = &tx_queue->buffer[insert_ptr]; |
| 275 | efx_dequeue_buffer(tx_queue, buffer); |
| 276 | buffer->len = 0; |
| 277 | } |
| 278 | |
| 279 | /* Free the fragment we were mid-way through pushing */ |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 280 | if (unmap_len) { |
| 281 | if (unmap_single) |
| 282 | pci_unmap_single(pci_dev, unmap_addr, unmap_len, |
| 283 | PCI_DMA_TODEVICE); |
| 284 | else |
| 285 | pci_unmap_page(pci_dev, unmap_addr, unmap_len, |
| 286 | PCI_DMA_TODEVICE); |
| 287 | } |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 288 | |
| 289 | return rc; |
| 290 | } |
| 291 | |
| 292 | /* Remove packets from the TX queue |
| 293 | * |
| 294 | * This removes packets from the TX queue, up to and including the |
| 295 | * specified index. |
| 296 | */ |
Ben Hutchings | 4d56606 | 2008-09-01 12:47:12 +0100 | [diff] [blame] | 297 | static void efx_dequeue_buffers(struct efx_tx_queue *tx_queue, |
| 298 | unsigned int index) |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 299 | { |
| 300 | struct efx_nic *efx = tx_queue->efx; |
| 301 | unsigned int stop_index, read_ptr; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 302 | |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 303 | stop_index = (index + 1) & tx_queue->ptr_mask; |
| 304 | read_ptr = tx_queue->read_count & tx_queue->ptr_mask; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 305 | |
| 306 | while (read_ptr != stop_index) { |
| 307 | struct efx_tx_buffer *buffer = &tx_queue->buffer[read_ptr]; |
| 308 | if (unlikely(buffer->len == 0)) { |
Ben Hutchings | 62776d0 | 2010-06-23 11:30:07 +0000 | [diff] [blame] | 309 | netif_err(efx, tx_err, efx->net_dev, |
| 310 | "TX queue %d spurious TX completion id %x\n", |
| 311 | tx_queue->queue, read_ptr); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 312 | efx_schedule_reset(efx, RESET_TYPE_TX_SKIP); |
| 313 | return; |
| 314 | } |
| 315 | |
| 316 | efx_dequeue_buffer(tx_queue, buffer); |
Ben Hutchings | dc8cfa5 | 2008-09-01 12:46:50 +0100 | [diff] [blame] | 317 | buffer->continuation = true; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 318 | buffer->len = 0; |
| 319 | |
| 320 | ++tx_queue->read_count; |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 321 | read_ptr = tx_queue->read_count & tx_queue->ptr_mask; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 322 | } |
| 323 | } |
| 324 | |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 325 | /* Initiate a packet transmission. We use one channel per CPU |
| 326 | * (sharing when we have more CPUs than channels). On Falcon, the TX |
| 327 | * completion events will be directed back to the CPU that transmitted |
| 328 | * the packet, which should be cache-efficient. |
| 329 | * |
| 330 | * Context: non-blocking. |
| 331 | * Note that returning anything other than NETDEV_TX_OK will cause the |
| 332 | * OS to free the skb. |
| 333 | */ |
Stephen Hemminger | 61357325 | 2009-08-31 19:50:58 +0000 | [diff] [blame] | 334 | netdev_tx_t efx_hard_start_xmit(struct sk_buff *skb, |
| 335 | struct net_device *net_dev) |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 336 | { |
Ben Hutchings | 767e468 | 2008-09-01 12:43:14 +0100 | [diff] [blame] | 337 | struct efx_nic *efx = netdev_priv(net_dev); |
Ben Hutchings | 60ac106 | 2008-09-01 12:44:59 +0100 | [diff] [blame] | 338 | struct efx_tx_queue *tx_queue; |
Ben Hutchings | 94b274b | 2011-01-10 21:18:20 +0000 | [diff] [blame] | 339 | unsigned index, type; |
Ben Hutchings | 60ac106 | 2008-09-01 12:44:59 +0100 | [diff] [blame] | 340 | |
Ben Hutchings | a7ef593 | 2009-03-04 09:52:37 +0000 | [diff] [blame] | 341 | if (unlikely(efx->port_inhibited)) |
| 342 | return NETDEV_TX_BUSY; |
| 343 | |
Ben Hutchings | 94b274b | 2011-01-10 21:18:20 +0000 | [diff] [blame] | 344 | index = skb_get_queue_mapping(skb); |
| 345 | type = skb->ip_summed == CHECKSUM_PARTIAL ? EFX_TXQ_TYPE_OFFLOAD : 0; |
| 346 | if (index >= efx->n_tx_channels) { |
| 347 | index -= efx->n_tx_channels; |
| 348 | type |= EFX_TXQ_TYPE_HIGHPRI; |
| 349 | } |
| 350 | tx_queue = efx_get_tx_queue(efx, index, type); |
Ben Hutchings | 60ac106 | 2008-09-01 12:44:59 +0100 | [diff] [blame] | 351 | |
Ben Hutchings | 497f5ba | 2009-11-23 16:07:05 +0000 | [diff] [blame] | 352 | return efx_enqueue_skb(tx_queue, skb); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 353 | } |
| 354 | |
Ben Hutchings | 60031fc | 2011-01-12 18:39:40 +0000 | [diff] [blame] | 355 | void efx_init_tx_queue_core_txq(struct efx_tx_queue *tx_queue) |
| 356 | { |
Ben Hutchings | 94b274b | 2011-01-10 21:18:20 +0000 | [diff] [blame] | 357 | struct efx_nic *efx = tx_queue->efx; |
| 358 | |
Ben Hutchings | 60031fc | 2011-01-12 18:39:40 +0000 | [diff] [blame] | 359 | /* Must be inverse of queue lookup in efx_hard_start_xmit() */ |
Ben Hutchings | 94b274b | 2011-01-10 21:18:20 +0000 | [diff] [blame] | 360 | tx_queue->core_txq = |
| 361 | netdev_get_tx_queue(efx->net_dev, |
| 362 | tx_queue->queue / EFX_TXQ_TYPES + |
| 363 | ((tx_queue->queue & EFX_TXQ_TYPE_HIGHPRI) ? |
| 364 | efx->n_tx_channels : 0)); |
| 365 | } |
| 366 | |
| 367 | int efx_setup_tc(struct net_device *net_dev, u8 num_tc) |
| 368 | { |
| 369 | struct efx_nic *efx = netdev_priv(net_dev); |
| 370 | struct efx_channel *channel; |
| 371 | struct efx_tx_queue *tx_queue; |
| 372 | unsigned tc; |
| 373 | int rc; |
| 374 | |
| 375 | if (efx_nic_rev(efx) < EFX_REV_FALCON_B0 || num_tc > EFX_MAX_TX_TC) |
| 376 | return -EINVAL; |
| 377 | |
| 378 | if (num_tc == net_dev->num_tc) |
| 379 | return 0; |
| 380 | |
| 381 | for (tc = 0; tc < num_tc; tc++) { |
| 382 | net_dev->tc_to_txq[tc].offset = tc * efx->n_tx_channels; |
| 383 | net_dev->tc_to_txq[tc].count = efx->n_tx_channels; |
| 384 | } |
| 385 | |
| 386 | if (num_tc > net_dev->num_tc) { |
| 387 | /* Initialise high-priority queues as necessary */ |
| 388 | efx_for_each_channel(channel, efx) { |
| 389 | efx_for_each_possible_channel_tx_queue(tx_queue, |
| 390 | channel) { |
| 391 | if (!(tx_queue->queue & EFX_TXQ_TYPE_HIGHPRI)) |
| 392 | continue; |
| 393 | if (!tx_queue->buffer) { |
| 394 | rc = efx_probe_tx_queue(tx_queue); |
| 395 | if (rc) |
| 396 | return rc; |
| 397 | } |
| 398 | if (!tx_queue->initialised) |
| 399 | efx_init_tx_queue(tx_queue); |
| 400 | efx_init_tx_queue_core_txq(tx_queue); |
| 401 | } |
| 402 | } |
| 403 | } else { |
| 404 | /* Reduce number of classes before number of queues */ |
| 405 | net_dev->num_tc = num_tc; |
| 406 | } |
| 407 | |
| 408 | rc = netif_set_real_num_tx_queues(net_dev, |
| 409 | max_t(int, num_tc, 1) * |
| 410 | efx->n_tx_channels); |
| 411 | if (rc) |
| 412 | return rc; |
| 413 | |
| 414 | /* Do not destroy high-priority queues when they become |
| 415 | * unused. We would have to flush them first, and it is |
| 416 | * fairly difficult to flush a subset of TX queues. Leave |
| 417 | * it to efx_fini_channels(). |
| 418 | */ |
| 419 | |
| 420 | net_dev->num_tc = num_tc; |
| 421 | return 0; |
Ben Hutchings | 60031fc | 2011-01-12 18:39:40 +0000 | [diff] [blame] | 422 | } |
| 423 | |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 424 | void efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index) |
| 425 | { |
| 426 | unsigned fill_level; |
| 427 | struct efx_nic *efx = tx_queue->efx; |
| 428 | |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 429 | EFX_BUG_ON_PARANOID(index > tx_queue->ptr_mask); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 430 | |
| 431 | efx_dequeue_buffers(tx_queue, index); |
| 432 | |
| 433 | /* See if we need to restart the netif queue. This barrier |
Ben Hutchings | c04bfc6 | 2010-12-10 01:24:16 +0000 | [diff] [blame] | 434 | * separates the update of read_count from the test of the |
| 435 | * queue state. */ |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 436 | smp_mb(); |
Ben Hutchings | c04bfc6 | 2010-12-10 01:24:16 +0000 | [diff] [blame] | 437 | if (unlikely(netif_tx_queue_stopped(tx_queue->core_txq)) && |
Neil Turton | 9d1aea6 | 2011-04-04 13:46:23 +0100 | [diff] [blame] | 438 | likely(efx->port_enabled) && |
| 439 | likely(!efx->port_inhibited)) { |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 440 | fill_level = tx_queue->insert_count - tx_queue->read_count; |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 441 | if (fill_level < EFX_TXQ_THRESHOLD(efx)) { |
Ben Hutchings | 5566861 | 2008-05-16 21:16:10 +0100 | [diff] [blame] | 442 | EFX_BUG_ON_PARANOID(!efx_dev_registered(efx)); |
Ben Hutchings | c04bfc6 | 2010-12-10 01:24:16 +0000 | [diff] [blame] | 443 | netif_tx_wake_queue(tx_queue->core_txq); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 444 | } |
| 445 | } |
Ben Hutchings | cd38557 | 2010-11-15 23:53:11 +0000 | [diff] [blame] | 446 | |
| 447 | /* Check whether the hardware queue is now empty */ |
| 448 | if ((int)(tx_queue->read_count - tx_queue->old_write_count) >= 0) { |
| 449 | tx_queue->old_write_count = ACCESS_ONCE(tx_queue->write_count); |
| 450 | if (tx_queue->read_count == tx_queue->old_write_count) { |
| 451 | smp_mb(); |
| 452 | tx_queue->empty_read_count = |
| 453 | tx_queue->read_count | EFX_EMPTY_COUNT_VALID; |
| 454 | } |
| 455 | } |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 456 | } |
| 457 | |
| 458 | int efx_probe_tx_queue(struct efx_tx_queue *tx_queue) |
| 459 | { |
| 460 | struct efx_nic *efx = tx_queue->efx; |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 461 | unsigned int entries; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 462 | int i, rc; |
| 463 | |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 464 | /* Create the smallest power-of-two aligned ring */ |
| 465 | entries = max(roundup_pow_of_two(efx->txq_entries), EFX_MIN_DMAQ_SIZE); |
| 466 | EFX_BUG_ON_PARANOID(entries > EFX_MAX_DMAQ_SIZE); |
| 467 | tx_queue->ptr_mask = entries - 1; |
| 468 | |
| 469 | netif_dbg(efx, probe, efx->net_dev, |
| 470 | "creating TX queue %d size %#x mask %#x\n", |
| 471 | tx_queue->queue, efx->txq_entries, tx_queue->ptr_mask); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 472 | |
| 473 | /* Allocate software ring */ |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 474 | tx_queue->buffer = kzalloc(entries * sizeof(*tx_queue->buffer), |
| 475 | GFP_KERNEL); |
Ben Hutchings | 60ac106 | 2008-09-01 12:44:59 +0100 | [diff] [blame] | 476 | if (!tx_queue->buffer) |
| 477 | return -ENOMEM; |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 478 | for (i = 0; i <= tx_queue->ptr_mask; ++i) |
Ben Hutchings | dc8cfa5 | 2008-09-01 12:46:50 +0100 | [diff] [blame] | 479 | tx_queue->buffer[i].continuation = true; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 480 | |
| 481 | /* Allocate hardware ring */ |
Ben Hutchings | 152b6a6 | 2009-11-29 03:43:56 +0000 | [diff] [blame] | 482 | rc = efx_nic_probe_tx(tx_queue); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 483 | if (rc) |
Ben Hutchings | 60ac106 | 2008-09-01 12:44:59 +0100 | [diff] [blame] | 484 | goto fail; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 485 | |
| 486 | return 0; |
| 487 | |
Ben Hutchings | 60ac106 | 2008-09-01 12:44:59 +0100 | [diff] [blame] | 488 | fail: |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 489 | kfree(tx_queue->buffer); |
| 490 | tx_queue->buffer = NULL; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 491 | return rc; |
| 492 | } |
| 493 | |
Ben Hutchings | bc3c90a | 2008-09-01 12:48:46 +0100 | [diff] [blame] | 494 | void efx_init_tx_queue(struct efx_tx_queue *tx_queue) |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 495 | { |
Ben Hutchings | 62776d0 | 2010-06-23 11:30:07 +0000 | [diff] [blame] | 496 | netif_dbg(tx_queue->efx, drv, tx_queue->efx->net_dev, |
| 497 | "initialising TX queue %d\n", tx_queue->queue); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 498 | |
| 499 | tx_queue->insert_count = 0; |
| 500 | tx_queue->write_count = 0; |
Ben Hutchings | cd38557 | 2010-11-15 23:53:11 +0000 | [diff] [blame] | 501 | tx_queue->old_write_count = 0; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 502 | tx_queue->read_count = 0; |
| 503 | tx_queue->old_read_count = 0; |
Ben Hutchings | cd38557 | 2010-11-15 23:53:11 +0000 | [diff] [blame] | 504 | tx_queue->empty_read_count = 0 | EFX_EMPTY_COUNT_VALID; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 505 | |
| 506 | /* Set up TX descriptor ring */ |
Ben Hutchings | 152b6a6 | 2009-11-29 03:43:56 +0000 | [diff] [blame] | 507 | efx_nic_init_tx(tx_queue); |
Ben Hutchings | 94b274b | 2011-01-10 21:18:20 +0000 | [diff] [blame] | 508 | |
| 509 | tx_queue->initialised = true; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 510 | } |
| 511 | |
| 512 | void efx_release_tx_buffers(struct efx_tx_queue *tx_queue) |
| 513 | { |
| 514 | struct efx_tx_buffer *buffer; |
| 515 | |
| 516 | if (!tx_queue->buffer) |
| 517 | return; |
| 518 | |
| 519 | /* Free any buffers left in the ring */ |
| 520 | while (tx_queue->read_count != tx_queue->write_count) { |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 521 | buffer = &tx_queue->buffer[tx_queue->read_count & tx_queue->ptr_mask]; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 522 | efx_dequeue_buffer(tx_queue, buffer); |
Ben Hutchings | dc8cfa5 | 2008-09-01 12:46:50 +0100 | [diff] [blame] | 523 | buffer->continuation = true; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 524 | buffer->len = 0; |
| 525 | |
| 526 | ++tx_queue->read_count; |
| 527 | } |
| 528 | } |
| 529 | |
| 530 | void efx_fini_tx_queue(struct efx_tx_queue *tx_queue) |
| 531 | { |
Ben Hutchings | 94b274b | 2011-01-10 21:18:20 +0000 | [diff] [blame] | 532 | if (!tx_queue->initialised) |
| 533 | return; |
| 534 | |
Ben Hutchings | 62776d0 | 2010-06-23 11:30:07 +0000 | [diff] [blame] | 535 | netif_dbg(tx_queue->efx, drv, tx_queue->efx->net_dev, |
| 536 | "shutting down TX queue %d\n", tx_queue->queue); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 537 | |
Ben Hutchings | 94b274b | 2011-01-10 21:18:20 +0000 | [diff] [blame] | 538 | tx_queue->initialised = false; |
| 539 | |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 540 | /* Flush TX queue, remove descriptor ring */ |
Ben Hutchings | 152b6a6 | 2009-11-29 03:43:56 +0000 | [diff] [blame] | 541 | efx_nic_fini_tx(tx_queue); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 542 | |
| 543 | efx_release_tx_buffers(tx_queue); |
| 544 | |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 545 | /* Free up TSO header cache */ |
| 546 | efx_fini_tso(tx_queue); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 547 | } |
| 548 | |
| 549 | void efx_remove_tx_queue(struct efx_tx_queue *tx_queue) |
| 550 | { |
Ben Hutchings | 94b274b | 2011-01-10 21:18:20 +0000 | [diff] [blame] | 551 | if (!tx_queue->buffer) |
| 552 | return; |
| 553 | |
Ben Hutchings | 62776d0 | 2010-06-23 11:30:07 +0000 | [diff] [blame] | 554 | netif_dbg(tx_queue->efx, drv, tx_queue->efx->net_dev, |
| 555 | "destroying TX queue %d\n", tx_queue->queue); |
Ben Hutchings | 152b6a6 | 2009-11-29 03:43:56 +0000 | [diff] [blame] | 556 | efx_nic_remove_tx(tx_queue); |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 557 | |
| 558 | kfree(tx_queue->buffer); |
| 559 | tx_queue->buffer = NULL; |
Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 563 | /* Efx TCP segmentation acceleration. |
| 564 | * |
| 565 | * Why? Because by doing it here in the driver we can go significantly |
| 566 | * faster than the GSO. |
| 567 | * |
| 568 | * Requires TX checksum offload support. |
| 569 | */ |
| 570 | |
| 571 | /* Number of bytes inserted at the start of a TSO header buffer, |
| 572 | * similar to NET_IP_ALIGN. |
| 573 | */ |
Ben Hutchings | 13e9ab1 | 2008-09-01 12:50:28 +0100 | [diff] [blame] | 574 | #ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 575 | #define TSOH_OFFSET 0 |
| 576 | #else |
| 577 | #define TSOH_OFFSET NET_IP_ALIGN |
| 578 | #endif |
| 579 | |
| 580 | #define TSOH_BUFFER(tsoh) ((u8 *)(tsoh + 1) + TSOH_OFFSET) |
| 581 | |
| 582 | /* Total size of struct efx_tso_header, buffer and padding */ |
| 583 | #define TSOH_SIZE(hdr_len) \ |
| 584 | (sizeof(struct efx_tso_header) + TSOH_OFFSET + hdr_len) |
| 585 | |
| 586 | /* Size of blocks on free list. Larger blocks must be allocated from |
| 587 | * the heap. |
| 588 | */ |
| 589 | #define TSOH_STD_SIZE 128 |
| 590 | |
| 591 | #define PTR_DIFF(p1, p2) ((u8 *)(p1) - (u8 *)(p2)) |
| 592 | #define ETH_HDR_LEN(skb) (skb_network_header(skb) - (skb)->data) |
| 593 | #define SKB_TCP_OFF(skb) PTR_DIFF(tcp_hdr(skb), (skb)->data) |
| 594 | #define SKB_IPV4_OFF(skb) PTR_DIFF(ip_hdr(skb), (skb)->data) |
Ben Hutchings | 738a8f4 | 2009-11-29 15:16:05 +0000 | [diff] [blame] | 595 | #define SKB_IPV6_OFF(skb) PTR_DIFF(ipv6_hdr(skb), (skb)->data) |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 596 | |
| 597 | /** |
| 598 | * struct tso_state - TSO state for an SKB |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 599 | * @out_len: Remaining length in current segment |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 600 | * @seqnum: Current sequence number |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 601 | * @ipv4_id: Current IPv4 ID, host endian |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 602 | * @packet_space: Remaining space in current packet |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 603 | * @dma_addr: DMA address of current position |
| 604 | * @in_len: Remaining length in current SKB fragment |
| 605 | * @unmap_len: Length of SKB fragment |
| 606 | * @unmap_addr: DMA address of SKB fragment |
| 607 | * @unmap_single: DMA single vs page mapping flag |
Ben Hutchings | 738a8f4 | 2009-11-29 15:16:05 +0000 | [diff] [blame] | 608 | * @protocol: Network protocol (after any VLAN header) |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 609 | * @header_len: Number of bytes of header |
| 610 | * @full_packet_size: Number of bytes to put in each outgoing segment |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 611 | * |
| 612 | * The state used during segmentation. It is put into this data structure |
| 613 | * just to make it easy to pass into inline functions. |
| 614 | */ |
| 615 | struct tso_state { |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 616 | /* Output position */ |
| 617 | unsigned out_len; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 618 | unsigned seqnum; |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 619 | unsigned ipv4_id; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 620 | unsigned packet_space; |
| 621 | |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 622 | /* Input position */ |
| 623 | dma_addr_t dma_addr; |
| 624 | unsigned in_len; |
| 625 | unsigned unmap_len; |
| 626 | dma_addr_t unmap_addr; |
| 627 | bool unmap_single; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 628 | |
Ben Hutchings | 738a8f4 | 2009-11-29 15:16:05 +0000 | [diff] [blame] | 629 | __be16 protocol; |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 630 | unsigned header_len; |
| 631 | int full_packet_size; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 632 | }; |
| 633 | |
| 634 | |
| 635 | /* |
| 636 | * Verify that our various assumptions about sk_buffs and the conditions |
Ben Hutchings | 738a8f4 | 2009-11-29 15:16:05 +0000 | [diff] [blame] | 637 | * under which TSO will be attempted hold true. Return the protocol number. |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 638 | */ |
Ben Hutchings | 738a8f4 | 2009-11-29 15:16:05 +0000 | [diff] [blame] | 639 | static __be16 efx_tso_check_protocol(struct sk_buff *skb) |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 640 | { |
Ben Hutchings | 740847d | 2008-09-01 12:48:23 +0100 | [diff] [blame] | 641 | __be16 protocol = skb->protocol; |
| 642 | |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 643 | EFX_BUG_ON_PARANOID(((struct ethhdr *)skb->data)->h_proto != |
Ben Hutchings | 740847d | 2008-09-01 12:48:23 +0100 | [diff] [blame] | 644 | protocol); |
| 645 | if (protocol == htons(ETH_P_8021Q)) { |
| 646 | /* Find the encapsulated protocol; reset network header |
| 647 | * and transport header based on that. */ |
| 648 | struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data; |
| 649 | protocol = veh->h_vlan_encapsulated_proto; |
| 650 | skb_set_network_header(skb, sizeof(*veh)); |
| 651 | if (protocol == htons(ETH_P_IP)) |
| 652 | skb_set_transport_header(skb, sizeof(*veh) + |
| 653 | 4 * ip_hdr(skb)->ihl); |
Ben Hutchings | 738a8f4 | 2009-11-29 15:16:05 +0000 | [diff] [blame] | 654 | else if (protocol == htons(ETH_P_IPV6)) |
| 655 | skb_set_transport_header(skb, sizeof(*veh) + |
| 656 | sizeof(struct ipv6hdr)); |
Ben Hutchings | 740847d | 2008-09-01 12:48:23 +0100 | [diff] [blame] | 657 | } |
| 658 | |
Ben Hutchings | 738a8f4 | 2009-11-29 15:16:05 +0000 | [diff] [blame] | 659 | if (protocol == htons(ETH_P_IP)) { |
| 660 | EFX_BUG_ON_PARANOID(ip_hdr(skb)->protocol != IPPROTO_TCP); |
| 661 | } else { |
| 662 | EFX_BUG_ON_PARANOID(protocol != htons(ETH_P_IPV6)); |
| 663 | EFX_BUG_ON_PARANOID(ipv6_hdr(skb)->nexthdr != NEXTHDR_TCP); |
| 664 | } |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 665 | EFX_BUG_ON_PARANOID((PTR_DIFF(tcp_hdr(skb), skb->data) |
| 666 | + (tcp_hdr(skb)->doff << 2u)) > |
| 667 | skb_headlen(skb)); |
Ben Hutchings | 738a8f4 | 2009-11-29 15:16:05 +0000 | [diff] [blame] | 668 | |
| 669 | return protocol; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 670 | } |
| 671 | |
| 672 | |
| 673 | /* |
| 674 | * Allocate a page worth of efx_tso_header structures, and string them |
| 675 | * into the tx_queue->tso_headers_free linked list. Return 0 or -ENOMEM. |
| 676 | */ |
| 677 | static int efx_tsoh_block_alloc(struct efx_tx_queue *tx_queue) |
| 678 | { |
| 679 | |
| 680 | struct pci_dev *pci_dev = tx_queue->efx->pci_dev; |
| 681 | struct efx_tso_header *tsoh; |
| 682 | dma_addr_t dma_addr; |
| 683 | u8 *base_kva, *kva; |
| 684 | |
| 685 | base_kva = pci_alloc_consistent(pci_dev, PAGE_SIZE, &dma_addr); |
| 686 | if (base_kva == NULL) { |
Ben Hutchings | 62776d0 | 2010-06-23 11:30:07 +0000 | [diff] [blame] | 687 | netif_err(tx_queue->efx, tx_err, tx_queue->efx->net_dev, |
| 688 | "Unable to allocate page for TSO headers\n"); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 689 | return -ENOMEM; |
| 690 | } |
| 691 | |
| 692 | /* pci_alloc_consistent() allocates pages. */ |
| 693 | EFX_BUG_ON_PARANOID(dma_addr & (PAGE_SIZE - 1u)); |
| 694 | |
| 695 | for (kva = base_kva; kva < base_kva + PAGE_SIZE; kva += TSOH_STD_SIZE) { |
| 696 | tsoh = (struct efx_tso_header *)kva; |
| 697 | tsoh->dma_addr = dma_addr + (TSOH_BUFFER(tsoh) - base_kva); |
| 698 | tsoh->next = tx_queue->tso_headers_free; |
| 699 | tx_queue->tso_headers_free = tsoh; |
| 700 | } |
| 701 | |
| 702 | return 0; |
| 703 | } |
| 704 | |
| 705 | |
| 706 | /* Free up a TSO header, and all others in the same page. */ |
| 707 | static void efx_tsoh_block_free(struct efx_tx_queue *tx_queue, |
| 708 | struct efx_tso_header *tsoh, |
| 709 | struct pci_dev *pci_dev) |
| 710 | { |
| 711 | struct efx_tso_header **p; |
| 712 | unsigned long base_kva; |
| 713 | dma_addr_t base_dma; |
| 714 | |
| 715 | base_kva = (unsigned long)tsoh & PAGE_MASK; |
| 716 | base_dma = tsoh->dma_addr & PAGE_MASK; |
| 717 | |
| 718 | p = &tx_queue->tso_headers_free; |
Ben Hutchings | b347564 | 2008-05-16 21:15:49 +0100 | [diff] [blame] | 719 | while (*p != NULL) { |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 720 | if (((unsigned long)*p & PAGE_MASK) == base_kva) |
| 721 | *p = (*p)->next; |
| 722 | else |
| 723 | p = &(*p)->next; |
Ben Hutchings | b347564 | 2008-05-16 21:15:49 +0100 | [diff] [blame] | 724 | } |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 725 | |
| 726 | pci_free_consistent(pci_dev, PAGE_SIZE, (void *)base_kva, base_dma); |
| 727 | } |
| 728 | |
| 729 | static struct efx_tso_header * |
| 730 | efx_tsoh_heap_alloc(struct efx_tx_queue *tx_queue, size_t header_len) |
| 731 | { |
| 732 | struct efx_tso_header *tsoh; |
| 733 | |
| 734 | tsoh = kmalloc(TSOH_SIZE(header_len), GFP_ATOMIC | GFP_DMA); |
| 735 | if (unlikely(!tsoh)) |
| 736 | return NULL; |
| 737 | |
| 738 | tsoh->dma_addr = pci_map_single(tx_queue->efx->pci_dev, |
| 739 | TSOH_BUFFER(tsoh), header_len, |
| 740 | PCI_DMA_TODEVICE); |
FUJITA Tomonori | 8d8bb39 | 2008-07-25 19:44:49 -0700 | [diff] [blame] | 741 | if (unlikely(pci_dma_mapping_error(tx_queue->efx->pci_dev, |
| 742 | tsoh->dma_addr))) { |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 743 | kfree(tsoh); |
| 744 | return NULL; |
| 745 | } |
| 746 | |
| 747 | tsoh->unmap_len = header_len; |
| 748 | return tsoh; |
| 749 | } |
| 750 | |
| 751 | static void |
| 752 | efx_tsoh_heap_free(struct efx_tx_queue *tx_queue, struct efx_tso_header *tsoh) |
| 753 | { |
| 754 | pci_unmap_single(tx_queue->efx->pci_dev, |
| 755 | tsoh->dma_addr, tsoh->unmap_len, |
| 756 | PCI_DMA_TODEVICE); |
| 757 | kfree(tsoh); |
| 758 | } |
| 759 | |
| 760 | /** |
| 761 | * efx_tx_queue_insert - push descriptors onto the TX queue |
| 762 | * @tx_queue: Efx TX queue |
| 763 | * @dma_addr: DMA address of fragment |
| 764 | * @len: Length of fragment |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 765 | * @final_buffer: The final buffer inserted into the queue |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 766 | * |
| 767 | * Push descriptors onto the TX queue. Return 0 on success or 1 if |
| 768 | * @tx_queue full. |
| 769 | */ |
| 770 | static int efx_tx_queue_insert(struct efx_tx_queue *tx_queue, |
| 771 | dma_addr_t dma_addr, unsigned len, |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 772 | struct efx_tx_buffer **final_buffer) |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 773 | { |
| 774 | struct efx_tx_buffer *buffer; |
| 775 | struct efx_nic *efx = tx_queue->efx; |
Ben Hutchings | 63f1988 | 2009-10-23 08:31:20 +0000 | [diff] [blame] | 776 | unsigned dma_len, fill_level, insert_ptr; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 777 | int q_space; |
| 778 | |
| 779 | EFX_BUG_ON_PARANOID(len <= 0); |
| 780 | |
| 781 | fill_level = tx_queue->insert_count - tx_queue->old_read_count; |
| 782 | /* -1 as there is no way to represent all descriptors used */ |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 783 | q_space = efx->txq_entries - 1 - fill_level; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 784 | |
| 785 | while (1) { |
| 786 | if (unlikely(q_space-- <= 0)) { |
| 787 | /* It might be that completions have happened |
| 788 | * since the xmit path last checked. Update |
| 789 | * the xmit path's copy of read_count. |
| 790 | */ |
Ben Hutchings | c04bfc6 | 2010-12-10 01:24:16 +0000 | [diff] [blame] | 791 | netif_tx_stop_queue(tx_queue->core_txq); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 792 | /* This memory barrier protects the change of |
Ben Hutchings | c04bfc6 | 2010-12-10 01:24:16 +0000 | [diff] [blame] | 793 | * queue state from the access of read_count. */ |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 794 | smp_mb(); |
| 795 | tx_queue->old_read_count = |
Ben Hutchings | 51c56f4 | 2010-11-10 18:46:40 +0000 | [diff] [blame] | 796 | ACCESS_ONCE(tx_queue->read_count); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 797 | fill_level = (tx_queue->insert_count |
| 798 | - tx_queue->old_read_count); |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 799 | q_space = efx->txq_entries - 1 - fill_level; |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 800 | if (unlikely(q_space-- <= 0)) { |
| 801 | *final_buffer = NULL; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 802 | return 1; |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 803 | } |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 804 | smp_mb(); |
Ben Hutchings | c04bfc6 | 2010-12-10 01:24:16 +0000 | [diff] [blame] | 805 | netif_tx_start_queue(tx_queue->core_txq); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 806 | } |
| 807 | |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 808 | insert_ptr = tx_queue->insert_count & tx_queue->ptr_mask; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 809 | buffer = &tx_queue->buffer[insert_ptr]; |
| 810 | ++tx_queue->insert_count; |
| 811 | |
| 812 | EFX_BUG_ON_PARANOID(tx_queue->insert_count - |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 813 | tx_queue->read_count >= |
| 814 | efx->txq_entries); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 815 | |
| 816 | efx_tsoh_free(tx_queue, buffer); |
| 817 | EFX_BUG_ON_PARANOID(buffer->len); |
| 818 | EFX_BUG_ON_PARANOID(buffer->unmap_len); |
| 819 | EFX_BUG_ON_PARANOID(buffer->skb); |
Ben Hutchings | dc8cfa5 | 2008-09-01 12:46:50 +0100 | [diff] [blame] | 820 | EFX_BUG_ON_PARANOID(!buffer->continuation); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 821 | EFX_BUG_ON_PARANOID(buffer->tsoh); |
| 822 | |
| 823 | buffer->dma_addr = dma_addr; |
| 824 | |
Ben Hutchings | 63f1988 | 2009-10-23 08:31:20 +0000 | [diff] [blame] | 825 | dma_len = efx_max_tx_len(efx, dma_addr); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 826 | |
| 827 | /* If there is enough space to send then do so */ |
| 828 | if (dma_len >= len) |
| 829 | break; |
| 830 | |
| 831 | buffer->len = dma_len; /* Don't set the other members */ |
| 832 | dma_addr += dma_len; |
| 833 | len -= dma_len; |
| 834 | } |
| 835 | |
| 836 | EFX_BUG_ON_PARANOID(!len); |
| 837 | buffer->len = len; |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 838 | *final_buffer = buffer; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 839 | return 0; |
| 840 | } |
| 841 | |
| 842 | |
| 843 | /* |
| 844 | * Put a TSO header into the TX queue. |
| 845 | * |
| 846 | * This is special-cased because we know that it is small enough to fit in |
| 847 | * a single fragment, and we know it doesn't cross a page boundary. It |
| 848 | * also allows us to not worry about end-of-packet etc. |
| 849 | */ |
Ben Hutchings | 4d56606 | 2008-09-01 12:47:12 +0100 | [diff] [blame] | 850 | static void efx_tso_put_header(struct efx_tx_queue *tx_queue, |
| 851 | struct efx_tso_header *tsoh, unsigned len) |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 852 | { |
| 853 | struct efx_tx_buffer *buffer; |
| 854 | |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 855 | buffer = &tx_queue->buffer[tx_queue->insert_count & tx_queue->ptr_mask]; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 856 | efx_tsoh_free(tx_queue, buffer); |
| 857 | EFX_BUG_ON_PARANOID(buffer->len); |
| 858 | EFX_BUG_ON_PARANOID(buffer->unmap_len); |
| 859 | EFX_BUG_ON_PARANOID(buffer->skb); |
Ben Hutchings | dc8cfa5 | 2008-09-01 12:46:50 +0100 | [diff] [blame] | 860 | EFX_BUG_ON_PARANOID(!buffer->continuation); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 861 | EFX_BUG_ON_PARANOID(buffer->tsoh); |
| 862 | buffer->len = len; |
| 863 | buffer->dma_addr = tsoh->dma_addr; |
| 864 | buffer->tsoh = tsoh; |
| 865 | |
| 866 | ++tx_queue->insert_count; |
| 867 | } |
| 868 | |
| 869 | |
| 870 | /* Remove descriptors put into a tx_queue. */ |
| 871 | static void efx_enqueue_unwind(struct efx_tx_queue *tx_queue) |
| 872 | { |
| 873 | struct efx_tx_buffer *buffer; |
Ben Hutchings | cc12dac | 2008-09-01 12:46:43 +0100 | [diff] [blame] | 874 | dma_addr_t unmap_addr; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 875 | |
| 876 | /* Work backwards until we hit the original insert pointer value */ |
| 877 | while (tx_queue->insert_count != tx_queue->write_count) { |
| 878 | --tx_queue->insert_count; |
| 879 | buffer = &tx_queue->buffer[tx_queue->insert_count & |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 880 | tx_queue->ptr_mask]; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 881 | efx_tsoh_free(tx_queue, buffer); |
| 882 | EFX_BUG_ON_PARANOID(buffer->skb); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 883 | if (buffer->unmap_len) { |
Ben Hutchings | cc12dac | 2008-09-01 12:46:43 +0100 | [diff] [blame] | 884 | unmap_addr = (buffer->dma_addr + buffer->len - |
| 885 | buffer->unmap_len); |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 886 | if (buffer->unmap_single) |
| 887 | pci_unmap_single(tx_queue->efx->pci_dev, |
Ben Hutchings | cc12dac | 2008-09-01 12:46:43 +0100 | [diff] [blame] | 888 | unmap_addr, buffer->unmap_len, |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 889 | PCI_DMA_TODEVICE); |
| 890 | else |
| 891 | pci_unmap_page(tx_queue->efx->pci_dev, |
Ben Hutchings | cc12dac | 2008-09-01 12:46:43 +0100 | [diff] [blame] | 892 | unmap_addr, buffer->unmap_len, |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 893 | PCI_DMA_TODEVICE); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 894 | buffer->unmap_len = 0; |
| 895 | } |
Neil Turton | a7ebd27 | 2009-12-23 13:47:13 +0000 | [diff] [blame] | 896 | buffer->len = 0; |
| 897 | buffer->continuation = true; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 898 | } |
| 899 | } |
| 900 | |
| 901 | |
| 902 | /* Parse the SKB header and initialise state. */ |
Ben Hutchings | 4d56606 | 2008-09-01 12:47:12 +0100 | [diff] [blame] | 903 | static void tso_start(struct tso_state *st, const struct sk_buff *skb) |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 904 | { |
| 905 | /* All ethernet/IP/TCP headers combined size is TCP header size |
| 906 | * plus offset of TCP header relative to start of packet. |
| 907 | */ |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 908 | st->header_len = ((tcp_hdr(skb)->doff << 2u) |
| 909 | + PTR_DIFF(tcp_hdr(skb), skb->data)); |
| 910 | st->full_packet_size = st->header_len + skb_shinfo(skb)->gso_size; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 911 | |
Ben Hutchings | 738a8f4 | 2009-11-29 15:16:05 +0000 | [diff] [blame] | 912 | if (st->protocol == htons(ETH_P_IP)) |
| 913 | st->ipv4_id = ntohs(ip_hdr(skb)->id); |
| 914 | else |
| 915 | st->ipv4_id = 0; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 916 | st->seqnum = ntohl(tcp_hdr(skb)->seq); |
| 917 | |
| 918 | EFX_BUG_ON_PARANOID(tcp_hdr(skb)->urg); |
| 919 | EFX_BUG_ON_PARANOID(tcp_hdr(skb)->syn); |
| 920 | EFX_BUG_ON_PARANOID(tcp_hdr(skb)->rst); |
| 921 | |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 922 | st->packet_space = st->full_packet_size; |
| 923 | st->out_len = skb->len - st->header_len; |
| 924 | st->unmap_len = 0; |
| 925 | st->unmap_single = false; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 926 | } |
| 927 | |
Ben Hutchings | 4d56606 | 2008-09-01 12:47:12 +0100 | [diff] [blame] | 928 | static int tso_get_fragment(struct tso_state *st, struct efx_nic *efx, |
| 929 | skb_frag_t *frag) |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 930 | { |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 931 | st->unmap_addr = pci_map_page(efx->pci_dev, frag->page, |
| 932 | frag->page_offset, frag->size, |
| 933 | PCI_DMA_TODEVICE); |
| 934 | if (likely(!pci_dma_mapping_error(efx->pci_dev, st->unmap_addr))) { |
| 935 | st->unmap_single = false; |
| 936 | st->unmap_len = frag->size; |
| 937 | st->in_len = frag->size; |
| 938 | st->dma_addr = st->unmap_addr; |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 939 | return 0; |
| 940 | } |
| 941 | return -ENOMEM; |
| 942 | } |
| 943 | |
Ben Hutchings | 4d56606 | 2008-09-01 12:47:12 +0100 | [diff] [blame] | 944 | static int tso_get_head_fragment(struct tso_state *st, struct efx_nic *efx, |
| 945 | const struct sk_buff *skb) |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 946 | { |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 947 | int hl = st->header_len; |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 948 | int len = skb_headlen(skb) - hl; |
| 949 | |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 950 | st->unmap_addr = pci_map_single(efx->pci_dev, skb->data + hl, |
| 951 | len, PCI_DMA_TODEVICE); |
| 952 | if (likely(!pci_dma_mapping_error(efx->pci_dev, st->unmap_addr))) { |
| 953 | st->unmap_single = true; |
| 954 | st->unmap_len = len; |
| 955 | st->in_len = len; |
| 956 | st->dma_addr = st->unmap_addr; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 957 | return 0; |
| 958 | } |
| 959 | return -ENOMEM; |
| 960 | } |
| 961 | |
| 962 | |
| 963 | /** |
| 964 | * tso_fill_packet_with_fragment - form descriptors for the current fragment |
| 965 | * @tx_queue: Efx TX queue |
| 966 | * @skb: Socket buffer |
| 967 | * @st: TSO state |
| 968 | * |
| 969 | * Form descriptors for the current fragment, until we reach the end |
| 970 | * of fragment or end-of-packet. Return 0 on success, 1 if not enough |
| 971 | * space in @tx_queue. |
| 972 | */ |
Ben Hutchings | 4d56606 | 2008-09-01 12:47:12 +0100 | [diff] [blame] | 973 | static int tso_fill_packet_with_fragment(struct efx_tx_queue *tx_queue, |
| 974 | const struct sk_buff *skb, |
| 975 | struct tso_state *st) |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 976 | { |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 977 | struct efx_tx_buffer *buffer; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 978 | int n, end_of_packet, rc; |
| 979 | |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 980 | if (st->in_len == 0) |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 981 | return 0; |
| 982 | if (st->packet_space == 0) |
| 983 | return 0; |
| 984 | |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 985 | EFX_BUG_ON_PARANOID(st->in_len <= 0); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 986 | EFX_BUG_ON_PARANOID(st->packet_space <= 0); |
| 987 | |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 988 | n = min(st->in_len, st->packet_space); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 989 | |
| 990 | st->packet_space -= n; |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 991 | st->out_len -= n; |
| 992 | st->in_len -= n; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 993 | |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 994 | rc = efx_tx_queue_insert(tx_queue, st->dma_addr, n, &buffer); |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 995 | if (likely(rc == 0)) { |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 996 | if (st->out_len == 0) |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 997 | /* Transfer ownership of the skb */ |
| 998 | buffer->skb = skb; |
| 999 | |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 1000 | end_of_packet = st->out_len == 0 || st->packet_space == 0; |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 1001 | buffer->continuation = !end_of_packet; |
| 1002 | |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 1003 | if (st->in_len == 0) { |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 1004 | /* Transfer ownership of the pci mapping */ |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 1005 | buffer->unmap_len = st->unmap_len; |
| 1006 | buffer->unmap_single = st->unmap_single; |
| 1007 | st->unmap_len = 0; |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 1008 | } |
| 1009 | } |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1010 | |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 1011 | st->dma_addr += n; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1012 | return rc; |
| 1013 | } |
| 1014 | |
| 1015 | |
| 1016 | /** |
| 1017 | * tso_start_new_packet - generate a new header and prepare for the new packet |
| 1018 | * @tx_queue: Efx TX queue |
| 1019 | * @skb: Socket buffer |
| 1020 | * @st: TSO state |
| 1021 | * |
| 1022 | * Generate a new header and prepare for the new packet. Return 0 on |
| 1023 | * success, or -1 if failed to alloc header. |
| 1024 | */ |
Ben Hutchings | 4d56606 | 2008-09-01 12:47:12 +0100 | [diff] [blame] | 1025 | static int tso_start_new_packet(struct efx_tx_queue *tx_queue, |
| 1026 | const struct sk_buff *skb, |
| 1027 | struct tso_state *st) |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1028 | { |
| 1029 | struct efx_tso_header *tsoh; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1030 | struct tcphdr *tsoh_th; |
| 1031 | unsigned ip_length; |
| 1032 | u8 *header; |
| 1033 | |
| 1034 | /* Allocate a DMA-mapped header buffer. */ |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 1035 | if (likely(TSOH_SIZE(st->header_len) <= TSOH_STD_SIZE)) { |
Ben Hutchings | b347564 | 2008-05-16 21:15:49 +0100 | [diff] [blame] | 1036 | if (tx_queue->tso_headers_free == NULL) { |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1037 | if (efx_tsoh_block_alloc(tx_queue)) |
| 1038 | return -1; |
Ben Hutchings | b347564 | 2008-05-16 21:15:49 +0100 | [diff] [blame] | 1039 | } |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1040 | EFX_BUG_ON_PARANOID(!tx_queue->tso_headers_free); |
| 1041 | tsoh = tx_queue->tso_headers_free; |
| 1042 | tx_queue->tso_headers_free = tsoh->next; |
| 1043 | tsoh->unmap_len = 0; |
| 1044 | } else { |
| 1045 | tx_queue->tso_long_headers++; |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 1046 | tsoh = efx_tsoh_heap_alloc(tx_queue, st->header_len); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1047 | if (unlikely(!tsoh)) |
| 1048 | return -1; |
| 1049 | } |
| 1050 | |
| 1051 | header = TSOH_BUFFER(tsoh); |
| 1052 | tsoh_th = (struct tcphdr *)(header + SKB_TCP_OFF(skb)); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1053 | |
| 1054 | /* Copy and update the headers. */ |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 1055 | memcpy(header, skb->data, st->header_len); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1056 | |
| 1057 | tsoh_th->seq = htonl(st->seqnum); |
| 1058 | st->seqnum += skb_shinfo(skb)->gso_size; |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 1059 | if (st->out_len > skb_shinfo(skb)->gso_size) { |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1060 | /* This packet will not finish the TSO burst. */ |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 1061 | ip_length = st->full_packet_size - ETH_HDR_LEN(skb); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1062 | tsoh_th->fin = 0; |
| 1063 | tsoh_th->psh = 0; |
| 1064 | } else { |
| 1065 | /* This packet will be the last in the TSO burst. */ |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 1066 | ip_length = st->header_len - ETH_HDR_LEN(skb) + st->out_len; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1067 | tsoh_th->fin = tcp_hdr(skb)->fin; |
| 1068 | tsoh_th->psh = tcp_hdr(skb)->psh; |
| 1069 | } |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1070 | |
Ben Hutchings | 738a8f4 | 2009-11-29 15:16:05 +0000 | [diff] [blame] | 1071 | if (st->protocol == htons(ETH_P_IP)) { |
| 1072 | struct iphdr *tsoh_iph = |
| 1073 | (struct iphdr *)(header + SKB_IPV4_OFF(skb)); |
| 1074 | |
| 1075 | tsoh_iph->tot_len = htons(ip_length); |
| 1076 | |
| 1077 | /* Linux leaves suitable gaps in the IP ID space for us to fill. */ |
| 1078 | tsoh_iph->id = htons(st->ipv4_id); |
| 1079 | st->ipv4_id++; |
| 1080 | } else { |
| 1081 | struct ipv6hdr *tsoh_iph = |
| 1082 | (struct ipv6hdr *)(header + SKB_IPV6_OFF(skb)); |
| 1083 | |
| 1084 | tsoh_iph->payload_len = htons(ip_length - sizeof(*tsoh_iph)); |
| 1085 | } |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1086 | |
| 1087 | st->packet_space = skb_shinfo(skb)->gso_size; |
| 1088 | ++tx_queue->tso_packets; |
| 1089 | |
| 1090 | /* Form a descriptor for this header. */ |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 1091 | efx_tso_put_header(tx_queue, tsoh, st->header_len); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1092 | |
| 1093 | return 0; |
| 1094 | } |
| 1095 | |
| 1096 | |
| 1097 | /** |
| 1098 | * efx_enqueue_skb_tso - segment and transmit a TSO socket buffer |
| 1099 | * @tx_queue: Efx TX queue |
| 1100 | * @skb: Socket buffer |
| 1101 | * |
| 1102 | * Context: You must hold netif_tx_lock() to call this function. |
| 1103 | * |
| 1104 | * Add socket buffer @skb to @tx_queue, doing TSO or return != 0 if |
| 1105 | * @skb was not enqueued. In all cases @skb is consumed. Return |
| 1106 | * %NETDEV_TX_OK or %NETDEV_TX_BUSY. |
| 1107 | */ |
| 1108 | static int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue, |
Ben Hutchings | 740847d | 2008-09-01 12:48:23 +0100 | [diff] [blame] | 1109 | struct sk_buff *skb) |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1110 | { |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 1111 | struct efx_nic *efx = tx_queue->efx; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1112 | int frag_i, rc, rc2 = NETDEV_TX_OK; |
| 1113 | struct tso_state state; |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1114 | |
Ben Hutchings | 738a8f4 | 2009-11-29 15:16:05 +0000 | [diff] [blame] | 1115 | /* Find the packet protocol and sanity-check it */ |
| 1116 | state.protocol = efx_tso_check_protocol(skb); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1117 | |
| 1118 | EFX_BUG_ON_PARANOID(tx_queue->write_count != tx_queue->insert_count); |
| 1119 | |
| 1120 | tso_start(&state, skb); |
| 1121 | |
| 1122 | /* Assume that skb header area contains exactly the headers, and |
| 1123 | * all payload is in the frag list. |
| 1124 | */ |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 1125 | if (skb_headlen(skb) == state.header_len) { |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1126 | /* Grab the first payload fragment. */ |
| 1127 | EFX_BUG_ON_PARANOID(skb_shinfo(skb)->nr_frags < 1); |
| 1128 | frag_i = 0; |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 1129 | rc = tso_get_fragment(&state, efx, |
| 1130 | skb_shinfo(skb)->frags + frag_i); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1131 | if (rc) |
| 1132 | goto mem_err; |
| 1133 | } else { |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 1134 | rc = tso_get_head_fragment(&state, efx, skb); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1135 | if (rc) |
| 1136 | goto mem_err; |
| 1137 | frag_i = -1; |
| 1138 | } |
| 1139 | |
| 1140 | if (tso_start_new_packet(tx_queue, skb, &state) < 0) |
| 1141 | goto mem_err; |
| 1142 | |
| 1143 | while (1) { |
| 1144 | rc = tso_fill_packet_with_fragment(tx_queue, skb, &state); |
Ben Hutchings | c04bfc6 | 2010-12-10 01:24:16 +0000 | [diff] [blame] | 1145 | if (unlikely(rc)) { |
| 1146 | rc2 = NETDEV_TX_BUSY; |
| 1147 | goto unwind; |
| 1148 | } |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1149 | |
| 1150 | /* Move onto the next fragment? */ |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 1151 | if (state.in_len == 0) { |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1152 | if (++frag_i >= skb_shinfo(skb)->nr_frags) |
| 1153 | /* End of payload reached. */ |
| 1154 | break; |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 1155 | rc = tso_get_fragment(&state, efx, |
| 1156 | skb_shinfo(skb)->frags + frag_i); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1157 | if (rc) |
| 1158 | goto mem_err; |
| 1159 | } |
| 1160 | |
| 1161 | /* Start at new packet? */ |
| 1162 | if (state.packet_space == 0 && |
| 1163 | tso_start_new_packet(tx_queue, skb, &state) < 0) |
| 1164 | goto mem_err; |
| 1165 | } |
| 1166 | |
| 1167 | /* Pass off to hardware */ |
Ben Hutchings | 152b6a6 | 2009-11-29 03:43:56 +0000 | [diff] [blame] | 1168 | efx_nic_push_buffers(tx_queue); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1169 | |
| 1170 | tx_queue->tso_bursts++; |
| 1171 | return NETDEV_TX_OK; |
| 1172 | |
| 1173 | mem_err: |
Ben Hutchings | 62776d0 | 2010-06-23 11:30:07 +0000 | [diff] [blame] | 1174 | netif_err(efx, tx_err, efx->net_dev, |
| 1175 | "Out of memory for TSO headers, or PCI mapping error\n"); |
Ben Hutchings | 9bc183d | 2009-11-23 16:06:47 +0000 | [diff] [blame] | 1176 | dev_kfree_skb_any(skb); |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1177 | |
| 1178 | unwind: |
Ben Hutchings | 5988b63 | 2008-09-01 12:46:36 +0100 | [diff] [blame] | 1179 | /* Free the DMA mapping we were in the process of writing out */ |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 1180 | if (state.unmap_len) { |
| 1181 | if (state.unmap_single) |
| 1182 | pci_unmap_single(efx->pci_dev, state.unmap_addr, |
| 1183 | state.unmap_len, PCI_DMA_TODEVICE); |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 1184 | else |
Ben Hutchings | 23d9e60 | 2008-09-01 12:47:02 +0100 | [diff] [blame] | 1185 | pci_unmap_page(efx->pci_dev, state.unmap_addr, |
| 1186 | state.unmap_len, PCI_DMA_TODEVICE); |
Ben Hutchings | ecbd95c | 2008-09-01 12:46:40 +0100 | [diff] [blame] | 1187 | } |
Ben Hutchings | 5988b63 | 2008-09-01 12:46:36 +0100 | [diff] [blame] | 1188 | |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1189 | efx_enqueue_unwind(tx_queue); |
| 1190 | return rc2; |
| 1191 | } |
| 1192 | |
| 1193 | |
| 1194 | /* |
| 1195 | * Free up all TSO datastructures associated with tx_queue. This |
| 1196 | * routine should be called only once the tx_queue is both empty and |
| 1197 | * will no longer be used. |
| 1198 | */ |
| 1199 | static void efx_fini_tso(struct efx_tx_queue *tx_queue) |
| 1200 | { |
| 1201 | unsigned i; |
| 1202 | |
Ben Hutchings | b347564 | 2008-05-16 21:15:49 +0100 | [diff] [blame] | 1203 | if (tx_queue->buffer) { |
Steve Hodgson | ecc910f | 2010-09-10 06:42:22 +0000 | [diff] [blame] | 1204 | for (i = 0; i <= tx_queue->ptr_mask; ++i) |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1205 | efx_tsoh_free(tx_queue, &tx_queue->buffer[i]); |
Ben Hutchings | b347564 | 2008-05-16 21:15:49 +0100 | [diff] [blame] | 1206 | } |
Ben Hutchings | b9b39b6 | 2008-05-07 12:51:12 +0100 | [diff] [blame] | 1207 | |
| 1208 | while (tx_queue->tso_headers_free != NULL) |
| 1209 | efx_tsoh_block_free(tx_queue, tx_queue->tso_headers_free, |
| 1210 | tx_queue->efx->pci_dev); |
| 1211 | } |