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1// SPDX-License-Identifier: GPL-2.0-only
2/****************************************************************************
3 * Driver for Solarflare network controllers and boards
4 * Copyright 2005-2006 Fen Systems Ltd.
5 * Copyright 2005-2013 Solarflare Communications Inc.
6 */
7
8#include <linux/socket.h>
9#include <linux/in.h>
10#include <linux/slab.h>
11#include <linux/ip.h>
12#include <linux/ipv6.h>
13#include <linux/tcp.h>
14#include <linux/udp.h>
15#include <linux/prefetch.h>
16#include <linux/moduleparam.h>
17#include <linux/iommu.h>
18#include <net/ip.h>
19#include <net/checksum.h>
20#include <net/xdp.h>
21#include <linux/bpf_trace.h>
22#include "net_driver.h"
23#include "efx.h"
24#include "rx_common.h"
25#include "filter.h"
26#include "nic.h"
27#include "selftest.h"
28#include "workarounds.h"
29
30/* Preferred number of descriptors to fill at once */
31#define EFX_RX_PREFERRED_BATCH 8U
32
33/* Maximum rx prefix used by any architecture. */
34#define EFX_MAX_RX_PREFIX_SIZE 16
35
36/* Size of buffer allocated for skb header area. */
37#define EFX_SKB_HEADERS 128u
38
39/* Each packet can consume up to ceil(max_frame_len / buffer_size) buffers */
40#define EFX_RX_MAX_FRAGS DIV_ROUND_UP(EFX_MAX_FRAME_LEN(EFX_MAX_MTU), \
41 EFX_RX_USR_BUF_SIZE)
42
43static void efx_rx_packet__check_len(struct efx_rx_queue *rx_queue,
44 struct efx_rx_buffer *rx_buf,
45 int len)
46{
47 struct efx_nic *efx = rx_queue->efx;
48 unsigned max_len = rx_buf->len - efx->type->rx_buffer_padding;
49
50 if (likely(len <= max_len))
51 return;
52
53 /* The packet must be discarded, but this is only a fatal error
54 * if the caller indicated it was
55 */
56 rx_buf->flags |= EFX_RX_PKT_DISCARD;
57
58 if (net_ratelimit())
59 netif_err(efx, rx_err, efx->net_dev,
60 "RX queue %d overlength RX event (%#x > %#x)\n",
61 efx_rx_queue_index(rx_queue), len, max_len);
62
63 efx_rx_queue_channel(rx_queue)->n_rx_overlength++;
64}
65
66/* Allocate and construct an SKB around page fragments */
67static struct sk_buff *efx_rx_mk_skb(struct efx_channel *channel,
68 struct efx_rx_buffer *rx_buf,
69 unsigned int n_frags,
70 u8 *eh, int hdr_len)
71{
72 struct efx_nic *efx = channel->efx;
73 struct sk_buff *skb;
74
75 /* Allocate an SKB to store the headers */
76 skb = netdev_alloc_skb(efx->net_dev,
77 efx->rx_ip_align + efx->rx_prefix_size +
78 hdr_len);
79 if (unlikely(skb == NULL)) {
80 atomic_inc(&efx->n_rx_noskb_drops);
81 return NULL;
82 }
83
84 EFX_WARN_ON_ONCE_PARANOID(rx_buf->len < hdr_len);
85
86 memcpy(skb->data + efx->rx_ip_align, eh - efx->rx_prefix_size,
87 efx->rx_prefix_size + hdr_len);
88 skb_reserve(skb, efx->rx_ip_align + efx->rx_prefix_size);
89 __skb_put(skb, hdr_len);
90
91 /* Append the remaining page(s) onto the frag list */
92 if (rx_buf->len > hdr_len) {
93 rx_buf->page_offset += hdr_len;
94 rx_buf->len -= hdr_len;
95
96 for (;;) {
97 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
98 rx_buf->page, rx_buf->page_offset,
99 rx_buf->len, efx->rx_buffer_truesize);
100 rx_buf->page = NULL;
101
102 if (skb_shinfo(skb)->nr_frags == n_frags)
103 break;
104
105 rx_buf = efx_rx_buf_next(&channel->rx_queue, rx_buf);
106 }
107 } else {
108 __free_pages(rx_buf->page, efx->rx_buffer_order);
109 rx_buf->page = NULL;
110 n_frags = 0;
111 }
112
113 /* Move past the ethernet header */
114 skb->protocol = eth_type_trans(skb, efx->net_dev);
115
116 skb_mark_napi_id(skb, &channel->napi_str);
117
118 return skb;
119}
120
121void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
122 unsigned int n_frags, unsigned int len, u16 flags)
123{
124 struct efx_nic *efx = rx_queue->efx;
125 struct efx_channel *channel = efx_rx_queue_channel(rx_queue);
126 struct efx_rx_buffer *rx_buf;
127
128 rx_queue->rx_packets++;
129
130 rx_buf = efx_rx_buffer(rx_queue, index);
131 rx_buf->flags |= flags;
132
133 /* Validate the number of fragments and completed length */
134 if (n_frags == 1) {
135 if (!(flags & EFX_RX_PKT_PREFIX_LEN))
136 efx_rx_packet__check_len(rx_queue, rx_buf, len);
137 } else if (unlikely(n_frags > EFX_RX_MAX_FRAGS) ||
138 unlikely(len <= (n_frags - 1) * efx->rx_dma_len) ||
139 unlikely(len > n_frags * efx->rx_dma_len) ||
140 unlikely(!efx->rx_scatter)) {
141 /* If this isn't an explicit discard request, either
142 * the hardware or the driver is broken.
143 */
144 WARN_ON(!(len == 0 && rx_buf->flags & EFX_RX_PKT_DISCARD));
145 rx_buf->flags |= EFX_RX_PKT_DISCARD;
146 }
147
148 netif_vdbg(efx, rx_status, efx->net_dev,
149 "RX queue %d received ids %x-%x len %d %s%s\n",
150 efx_rx_queue_index(rx_queue), index,
151 (index + n_frags - 1) & rx_queue->ptr_mask, len,
152 (rx_buf->flags & EFX_RX_PKT_CSUMMED) ? " [SUMMED]" : "",
153 (rx_buf->flags & EFX_RX_PKT_DISCARD) ? " [DISCARD]" : "");
154
155 /* Discard packet, if instructed to do so. Process the
156 * previous receive first.
157 */
158 if (unlikely(rx_buf->flags & EFX_RX_PKT_DISCARD)) {
159 efx_rx_flush_packet(channel);
160 efx_discard_rx_packet(channel, rx_buf, n_frags);
161 return;
162 }
163
164 if (n_frags == 1 && !(flags & EFX_RX_PKT_PREFIX_LEN))
165 rx_buf->len = len;
166
167 /* Release and/or sync the DMA mapping - assumes all RX buffers
168 * consumed in-order per RX queue.
169 */
170 efx_sync_rx_buffer(efx, rx_buf, rx_buf->len);
171
172 /* Prefetch nice and early so data will (hopefully) be in cache by
173 * the time we look at it.
174 */
175 prefetch(efx_rx_buf_va(rx_buf));
176
177 rx_buf->page_offset += efx->rx_prefix_size;
178 rx_buf->len -= efx->rx_prefix_size;
179
180 if (n_frags > 1) {
181 /* Release/sync DMA mapping for additional fragments.
182 * Fix length for last fragment.
183 */
184 unsigned int tail_frags = n_frags - 1;
185
186 for (;;) {
187 rx_buf = efx_rx_buf_next(rx_queue, rx_buf);
188 if (--tail_frags == 0)
189 break;
190 efx_sync_rx_buffer(efx, rx_buf, efx->rx_dma_len);
191 }
192 rx_buf->len = len - (n_frags - 1) * efx->rx_dma_len;
193 efx_sync_rx_buffer(efx, rx_buf, rx_buf->len);
194 }
195
196 /* All fragments have been DMA-synced, so recycle pages. */
197 rx_buf = efx_rx_buffer(rx_queue, index);
198 efx_recycle_rx_pages(channel, rx_buf, n_frags);
199
200 /* Pipeline receives so that we give time for packet headers to be
201 * prefetched into cache.
202 */
203 efx_rx_flush_packet(channel);
204 channel->rx_pkt_n_frags = n_frags;
205 channel->rx_pkt_index = index;
206}
207
208static void efx_rx_deliver(struct efx_channel *channel, u8 *eh,
209 struct efx_rx_buffer *rx_buf,
210 unsigned int n_frags)
211{
212 struct sk_buff *skb;
213 u16 hdr_len = min_t(u16, rx_buf->len, EFX_SKB_HEADERS);
214
215 skb = efx_rx_mk_skb(channel, rx_buf, n_frags, eh, hdr_len);
216 if (unlikely(skb == NULL)) {
217 struct efx_rx_queue *rx_queue;
218
219 rx_queue = efx_channel_get_rx_queue(channel);
220 efx_free_rx_buffers(rx_queue, rx_buf, n_frags);
221 return;
222 }
223 skb_record_rx_queue(skb, channel->rx_queue.core_index);
224
225 /* Set the SKB flags */
226 skb_checksum_none_assert(skb);
227 if (likely(rx_buf->flags & EFX_RX_PKT_CSUMMED)) {
228 skb->ip_summed = CHECKSUM_UNNECESSARY;
229 skb->csum_level = !!(rx_buf->flags & EFX_RX_PKT_CSUM_LEVEL);
230 }
231
232 efx_rx_skb_attach_timestamp(channel, skb);
233
234 if (channel->type->receive_skb)
235 if (channel->type->receive_skb(channel, skb))
236 return;
237
238 /* Pass the packet up */
239 if (channel->rx_list != NULL)
240 /* Add to list, will pass up later */
241 list_add_tail(&skb->list, channel->rx_list);
242 else
243 /* No list, so pass it up now */
244 netif_receive_skb(skb);
245}
246
247/** efx_do_xdp: perform XDP processing on a received packet
248 *
249 * Returns true if packet should still be delivered.
250 */
251static bool efx_do_xdp(struct efx_nic *efx, struct efx_channel *channel,
252 struct efx_rx_buffer *rx_buf, u8 **ehp)
253{
254 u8 rx_prefix[EFX_MAX_RX_PREFIX_SIZE];
255 struct efx_rx_queue *rx_queue;
256 struct bpf_prog *xdp_prog;
257 struct xdp_frame *xdpf;
258 struct xdp_buff xdp;
259 u32 xdp_act;
260 s16 offset;
261 int err;
262
263 xdp_prog = rcu_dereference_bh(efx->xdp_prog);
264 if (!xdp_prog)
265 return true;
266
267 rx_queue = efx_channel_get_rx_queue(channel);
268
269 if (unlikely(channel->rx_pkt_n_frags > 1)) {
270 /* We can't do XDP on fragmented packets - drop. */
271 efx_free_rx_buffers(rx_queue, rx_buf,
272 channel->rx_pkt_n_frags);
273 if (net_ratelimit())
274 netif_err(efx, rx_err, efx->net_dev,
275 "XDP is not possible with multiple receive fragments (%d)\n",
276 channel->rx_pkt_n_frags);
277 channel->n_rx_xdp_bad_drops++;
278 return false;
279 }
280
281 dma_sync_single_for_cpu(&efx->pci_dev->dev, rx_buf->dma_addr,
282 rx_buf->len, DMA_FROM_DEVICE);
283
284 /* Save the rx prefix. */
285 EFX_WARN_ON_PARANOID(efx->rx_prefix_size > EFX_MAX_RX_PREFIX_SIZE);
286 memcpy(rx_prefix, *ehp - efx->rx_prefix_size,
287 efx->rx_prefix_size);
288
289 xdp_init_buff(&xdp, efx->rx_page_buf_step, &rx_queue->xdp_rxq_info);
290 /* No support yet for XDP metadata */
291 xdp_prepare_buff(&xdp, *ehp - EFX_XDP_HEADROOM, EFX_XDP_HEADROOM,
292 rx_buf->len, false);
293
294 xdp_act = bpf_prog_run_xdp(xdp_prog, &xdp);
295
296 offset = (u8 *)xdp.data - *ehp;
297
298 switch (xdp_act) {
299 case XDP_PASS:
300 /* Fix up rx prefix. */
301 if (offset) {
302 *ehp += offset;
303 rx_buf->page_offset += offset;
304 rx_buf->len -= offset;
305 memcpy(*ehp - efx->rx_prefix_size, rx_prefix,
306 efx->rx_prefix_size);
307 }
308 break;
309
310 case XDP_TX:
311 /* Buffer ownership passes to tx on success. */
312 xdpf = xdp_convert_buff_to_frame(&xdp);
313 err = efx_xdp_tx_buffers(efx, 1, &xdpf, true);
314 if (unlikely(err != 1)) {
315 efx_free_rx_buffers(rx_queue, rx_buf, 1);
316 if (net_ratelimit())
317 netif_err(efx, rx_err, efx->net_dev,
318 "XDP TX failed (%d)\n", err);
319 channel->n_rx_xdp_bad_drops++;
320 trace_xdp_exception(efx->net_dev, xdp_prog, xdp_act);
321 } else {
322 channel->n_rx_xdp_tx++;
323 }
324 break;
325
326 case XDP_REDIRECT:
327 err = xdp_do_redirect(efx->net_dev, &xdp, xdp_prog);
328 if (unlikely(err)) {
329 efx_free_rx_buffers(rx_queue, rx_buf, 1);
330 if (net_ratelimit())
331 netif_err(efx, rx_err, efx->net_dev,
332 "XDP redirect failed (%d)\n", err);
333 channel->n_rx_xdp_bad_drops++;
334 trace_xdp_exception(efx->net_dev, xdp_prog, xdp_act);
335 } else {
336 channel->n_rx_xdp_redirect++;
337 }
338 break;
339
340 default:
341 bpf_warn_invalid_xdp_action(efx->net_dev, xdp_prog, xdp_act);
342 efx_free_rx_buffers(rx_queue, rx_buf, 1);
343 channel->n_rx_xdp_bad_drops++;
344 trace_xdp_exception(efx->net_dev, xdp_prog, xdp_act);
345 break;
346
347 case XDP_ABORTED:
348 trace_xdp_exception(efx->net_dev, xdp_prog, xdp_act);
349 fallthrough;
350 case XDP_DROP:
351 efx_free_rx_buffers(rx_queue, rx_buf, 1);
352 channel->n_rx_xdp_drops++;
353 break;
354 }
355
356 return xdp_act == XDP_PASS;
357}
358
359/* Handle a received packet. Second half: Touches packet payload. */
360void __efx_rx_packet(struct efx_channel *channel)
361{
362 struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel);
363 struct efx_nic *efx = channel->efx;
364 struct efx_rx_buffer *rx_buf =
365 efx_rx_buffer(rx_queue, channel->rx_pkt_index);
366 u8 *eh = efx_rx_buf_va(rx_buf);
367
368 /* Read length from the prefix if necessary. This already
369 * excludes the length of the prefix itself.
370 */
371 if (rx_buf->flags & EFX_RX_PKT_PREFIX_LEN) {
372 rx_buf->len = le16_to_cpup((__le16 *)
373 (eh + efx->rx_packet_len_offset));
374 /* A known issue may prevent this being filled in;
375 * if that happens, just drop the packet.
376 * Must do that in the driver since passing a zero-length
377 * packet up to the stack may cause a crash.
378 */
379 if (unlikely(!rx_buf->len)) {
380 efx_free_rx_buffers(rx_queue, rx_buf,
381 channel->rx_pkt_n_frags);
382 channel->n_rx_frm_trunc++;
383 goto out;
384 }
385 }
386
387 /* If we're in loopback test, then pass the packet directly to the
388 * loopback layer, and free the rx_buf here
389 */
390 if (unlikely(efx->loopback_selftest)) {
391 efx_loopback_rx_packet(efx, eh, rx_buf->len);
392 efx_free_rx_buffers(rx_queue, rx_buf,
393 channel->rx_pkt_n_frags);
394 goto out;
395 }
396
397 if (!efx_do_xdp(efx, channel, rx_buf, &eh))
398 goto out;
399
400 if (unlikely(!(efx->net_dev->features & NETIF_F_RXCSUM)))
401 rx_buf->flags &= ~EFX_RX_PKT_CSUMMED;
402
403 if ((rx_buf->flags & EFX_RX_PKT_TCP) && !channel->type->receive_skb)
404 efx_rx_packet_gro(channel, rx_buf, channel->rx_pkt_n_frags, eh, 0);
405 else
406 efx_rx_deliver(channel, eh, rx_buf, channel->rx_pkt_n_frags);
407out:
408 channel->rx_pkt_n_frags = 0;
409}
1/****************************************************************************
2 * Driver for Solarflare network controllers and boards
3 * Copyright 2005-2006 Fen Systems Ltd.
4 * Copyright 2005-2013 Solarflare Communications Inc.
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/socket.h>
12#include <linux/in.h>
13#include <linux/slab.h>
14#include <linux/ip.h>
15#include <linux/ipv6.h>
16#include <linux/tcp.h>
17#include <linux/udp.h>
18#include <linux/prefetch.h>
19#include <linux/moduleparam.h>
20#include <linux/iommu.h>
21#include <net/ip.h>
22#include <net/checksum.h>
23#include "net_driver.h"
24#include "efx.h"
25#include "filter.h"
26#include "nic.h"
27#include "selftest.h"
28#include "workarounds.h"
29
30/* Preferred number of descriptors to fill at once */
31#define EFX_RX_PREFERRED_BATCH 8U
32
33/* Number of RX buffers to recycle pages for. When creating the RX page recycle
34 * ring, this number is divided by the number of buffers per page to calculate
35 * the number of pages to store in the RX page recycle ring.
36 */
37#define EFX_RECYCLE_RING_SIZE_IOMMU 4096
38#define EFX_RECYCLE_RING_SIZE_NOIOMMU (2 * EFX_RX_PREFERRED_BATCH)
39
40/* Size of buffer allocated for skb header area. */
41#define EFX_SKB_HEADERS 128u
42
43/* This is the percentage fill level below which new RX descriptors
44 * will be added to the RX descriptor ring.
45 */
46static unsigned int rx_refill_threshold;
47
48/* Each packet can consume up to ceil(max_frame_len / buffer_size) buffers */
49#define EFX_RX_MAX_FRAGS DIV_ROUND_UP(EFX_MAX_FRAME_LEN(EFX_MAX_MTU), \
50 EFX_RX_USR_BUF_SIZE)
51
52/*
53 * RX maximum head room required.
54 *
55 * This must be at least 1 to prevent overflow, plus one packet-worth
56 * to allow pipelined receives.
57 */
58#define EFX_RXD_HEAD_ROOM (1 + EFX_RX_MAX_FRAGS)
59
60static inline u8 *efx_rx_buf_va(struct efx_rx_buffer *buf)
61{
62 return page_address(buf->page) + buf->page_offset;
63}
64
65static inline u32 efx_rx_buf_hash(struct efx_nic *efx, const u8 *eh)
66{
67#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
68 return __le32_to_cpup((const __le32 *)(eh + efx->rx_packet_hash_offset));
69#else
70 const u8 *data = eh + efx->rx_packet_hash_offset;
71 return (u32)data[0] |
72 (u32)data[1] << 8 |
73 (u32)data[2] << 16 |
74 (u32)data[3] << 24;
75#endif
76}
77
78static inline struct efx_rx_buffer *
79efx_rx_buf_next(struct efx_rx_queue *rx_queue, struct efx_rx_buffer *rx_buf)
80{
81 if (unlikely(rx_buf == efx_rx_buffer(rx_queue, rx_queue->ptr_mask)))
82 return efx_rx_buffer(rx_queue, 0);
83 else
84 return rx_buf + 1;
85}
86
87static inline void efx_sync_rx_buffer(struct efx_nic *efx,
88 struct efx_rx_buffer *rx_buf,
89 unsigned int len)
90{
91 dma_sync_single_for_cpu(&efx->pci_dev->dev, rx_buf->dma_addr, len,
92 DMA_FROM_DEVICE);
93}
94
95void efx_rx_config_page_split(struct efx_nic *efx)
96{
97 efx->rx_page_buf_step = ALIGN(efx->rx_dma_len + efx->rx_ip_align,
98 EFX_RX_BUF_ALIGNMENT);
99 efx->rx_bufs_per_page = efx->rx_buffer_order ? 1 :
100 ((PAGE_SIZE - sizeof(struct efx_rx_page_state)) /
101 efx->rx_page_buf_step);
102 efx->rx_buffer_truesize = (PAGE_SIZE << efx->rx_buffer_order) /
103 efx->rx_bufs_per_page;
104 efx->rx_pages_per_batch = DIV_ROUND_UP(EFX_RX_PREFERRED_BATCH,
105 efx->rx_bufs_per_page);
106}
107
108/* Check the RX page recycle ring for a page that can be reused. */
109static struct page *efx_reuse_page(struct efx_rx_queue *rx_queue)
110{
111 struct efx_nic *efx = rx_queue->efx;
112 struct page *page;
113 struct efx_rx_page_state *state;
114 unsigned index;
115
116 index = rx_queue->page_remove & rx_queue->page_ptr_mask;
117 page = rx_queue->page_ring[index];
118 if (page == NULL)
119 return NULL;
120
121 rx_queue->page_ring[index] = NULL;
122 /* page_remove cannot exceed page_add. */
123 if (rx_queue->page_remove != rx_queue->page_add)
124 ++rx_queue->page_remove;
125
126 /* If page_count is 1 then we hold the only reference to this page. */
127 if (page_count(page) == 1) {
128 ++rx_queue->page_recycle_count;
129 return page;
130 } else {
131 state = page_address(page);
132 dma_unmap_page(&efx->pci_dev->dev, state->dma_addr,
133 PAGE_SIZE << efx->rx_buffer_order,
134 DMA_FROM_DEVICE);
135 put_page(page);
136 ++rx_queue->page_recycle_failed;
137 }
138
139 return NULL;
140}
141
142/**
143 * efx_init_rx_buffers - create EFX_RX_BATCH page-based RX buffers
144 *
145 * @rx_queue: Efx RX queue
146 *
147 * This allocates a batch of pages, maps them for DMA, and populates
148 * struct efx_rx_buffers for each one. Return a negative error code or
149 * 0 on success. If a single page can be used for multiple buffers,
150 * then the page will either be inserted fully, or not at all.
151 */
152static int efx_init_rx_buffers(struct efx_rx_queue *rx_queue, bool atomic)
153{
154 struct efx_nic *efx = rx_queue->efx;
155 struct efx_rx_buffer *rx_buf;
156 struct page *page;
157 unsigned int page_offset;
158 struct efx_rx_page_state *state;
159 dma_addr_t dma_addr;
160 unsigned index, count;
161
162 count = 0;
163 do {
164 page = efx_reuse_page(rx_queue);
165 if (page == NULL) {
166 page = alloc_pages(__GFP_COLD | __GFP_COMP |
167 (atomic ? GFP_ATOMIC : GFP_KERNEL),
168 efx->rx_buffer_order);
169 if (unlikely(page == NULL))
170 return -ENOMEM;
171 dma_addr =
172 dma_map_page(&efx->pci_dev->dev, page, 0,
173 PAGE_SIZE << efx->rx_buffer_order,
174 DMA_FROM_DEVICE);
175 if (unlikely(dma_mapping_error(&efx->pci_dev->dev,
176 dma_addr))) {
177 __free_pages(page, efx->rx_buffer_order);
178 return -EIO;
179 }
180 state = page_address(page);
181 state->dma_addr = dma_addr;
182 } else {
183 state = page_address(page);
184 dma_addr = state->dma_addr;
185 }
186
187 dma_addr += sizeof(struct efx_rx_page_state);
188 page_offset = sizeof(struct efx_rx_page_state);
189
190 do {
191 index = rx_queue->added_count & rx_queue->ptr_mask;
192 rx_buf = efx_rx_buffer(rx_queue, index);
193 rx_buf->dma_addr = dma_addr + efx->rx_ip_align;
194 rx_buf->page = page;
195 rx_buf->page_offset = page_offset + efx->rx_ip_align;
196 rx_buf->len = efx->rx_dma_len;
197 rx_buf->flags = 0;
198 ++rx_queue->added_count;
199 get_page(page);
200 dma_addr += efx->rx_page_buf_step;
201 page_offset += efx->rx_page_buf_step;
202 } while (page_offset + efx->rx_page_buf_step <= PAGE_SIZE);
203
204 rx_buf->flags = EFX_RX_BUF_LAST_IN_PAGE;
205 } while (++count < efx->rx_pages_per_batch);
206
207 return 0;
208}
209
210/* Unmap a DMA-mapped page. This function is only called for the final RX
211 * buffer in a page.
212 */
213static void efx_unmap_rx_buffer(struct efx_nic *efx,
214 struct efx_rx_buffer *rx_buf)
215{
216 struct page *page = rx_buf->page;
217
218 if (page) {
219 struct efx_rx_page_state *state = page_address(page);
220 dma_unmap_page(&efx->pci_dev->dev,
221 state->dma_addr,
222 PAGE_SIZE << efx->rx_buffer_order,
223 DMA_FROM_DEVICE);
224 }
225}
226
227static void efx_free_rx_buffer(struct efx_rx_buffer *rx_buf)
228{
229 if (rx_buf->page) {
230 put_page(rx_buf->page);
231 rx_buf->page = NULL;
232 }
233}
234
235/* Attempt to recycle the page if there is an RX recycle ring; the page can
236 * only be added if this is the final RX buffer, to prevent pages being used in
237 * the descriptor ring and appearing in the recycle ring simultaneously.
238 */
239static void efx_recycle_rx_page(struct efx_channel *channel,
240 struct efx_rx_buffer *rx_buf)
241{
242 struct page *page = rx_buf->page;
243 struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel);
244 struct efx_nic *efx = rx_queue->efx;
245 unsigned index;
246
247 /* Only recycle the page after processing the final buffer. */
248 if (!(rx_buf->flags & EFX_RX_BUF_LAST_IN_PAGE))
249 return;
250
251 index = rx_queue->page_add & rx_queue->page_ptr_mask;
252 if (rx_queue->page_ring[index] == NULL) {
253 unsigned read_index = rx_queue->page_remove &
254 rx_queue->page_ptr_mask;
255
256 /* The next slot in the recycle ring is available, but
257 * increment page_remove if the read pointer currently
258 * points here.
259 */
260 if (read_index == index)
261 ++rx_queue->page_remove;
262 rx_queue->page_ring[index] = page;
263 ++rx_queue->page_add;
264 return;
265 }
266 ++rx_queue->page_recycle_full;
267 efx_unmap_rx_buffer(efx, rx_buf);
268 put_page(rx_buf->page);
269}
270
271static void efx_fini_rx_buffer(struct efx_rx_queue *rx_queue,
272 struct efx_rx_buffer *rx_buf)
273{
274 /* Release the page reference we hold for the buffer. */
275 if (rx_buf->page)
276 put_page(rx_buf->page);
277
278 /* If this is the last buffer in a page, unmap and free it. */
279 if (rx_buf->flags & EFX_RX_BUF_LAST_IN_PAGE) {
280 efx_unmap_rx_buffer(rx_queue->efx, rx_buf);
281 efx_free_rx_buffer(rx_buf);
282 }
283 rx_buf->page = NULL;
284}
285
286/* Recycle the pages that are used by buffers that have just been received. */
287static void efx_recycle_rx_pages(struct efx_channel *channel,
288 struct efx_rx_buffer *rx_buf,
289 unsigned int n_frags)
290{
291 struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel);
292
293 do {
294 efx_recycle_rx_page(channel, rx_buf);
295 rx_buf = efx_rx_buf_next(rx_queue, rx_buf);
296 } while (--n_frags);
297}
298
299static void efx_discard_rx_packet(struct efx_channel *channel,
300 struct efx_rx_buffer *rx_buf,
301 unsigned int n_frags)
302{
303 struct efx_rx_queue *rx_queue = efx_channel_get_rx_queue(channel);
304
305 efx_recycle_rx_pages(channel, rx_buf, n_frags);
306
307 do {
308 efx_free_rx_buffer(rx_buf);
309 rx_buf = efx_rx_buf_next(rx_queue, rx_buf);
310 } while (--n_frags);
311}
312
313/**
314 * efx_fast_push_rx_descriptors - push new RX descriptors quickly
315 * @rx_queue: RX descriptor queue
316 *
317 * This will aim to fill the RX descriptor queue up to
318 * @rx_queue->@max_fill. If there is insufficient atomic
319 * memory to do so, a slow fill will be scheduled.
320 *
321 * The caller must provide serialisation (none is used here). In practise,
322 * this means this function must run from the NAPI handler, or be called
323 * when NAPI is disabled.
324 */
325void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue, bool atomic)
326{
327 struct efx_nic *efx = rx_queue->efx;
328 unsigned int fill_level, batch_size;
329 int space, rc = 0;
330
331 if (!rx_queue->refill_enabled)
332 return;
333
334 /* Calculate current fill level, and exit if we don't need to fill */
335 fill_level = (rx_queue->added_count - rx_queue->removed_count);
336 EFX_BUG_ON_PARANOID(fill_level > rx_queue->efx->rxq_entries);
337 if (fill_level >= rx_queue->fast_fill_trigger)
338 goto out;
339
340 /* Record minimum fill level */
341 if (unlikely(fill_level < rx_queue->min_fill)) {
342 if (fill_level)
343 rx_queue->min_fill = fill_level;
344 }
345
346 batch_size = efx->rx_pages_per_batch * efx->rx_bufs_per_page;
347 space = rx_queue->max_fill - fill_level;
348 EFX_BUG_ON_PARANOID(space < batch_size);
349
350 netif_vdbg(rx_queue->efx, rx_status, rx_queue->efx->net_dev,
351 "RX queue %d fast-filling descriptor ring from"
352 " level %d to level %d\n",
353 efx_rx_queue_index(rx_queue), fill_level,
354 rx_queue->max_fill);
355
356
357 do {
358 rc = efx_init_rx_buffers(rx_queue, atomic);
359 if (unlikely(rc)) {
360 /* Ensure that we don't leave the rx queue empty */
361 if (rx_queue->added_count == rx_queue->removed_count)
362 efx_schedule_slow_fill(rx_queue);
363 goto out;
364 }
365 } while ((space -= batch_size) >= batch_size);
366
367 netif_vdbg(rx_queue->efx, rx_status, rx_queue->efx->net_dev,
368 "RX queue %d fast-filled descriptor ring "
369 "to level %d\n", efx_rx_queue_index(rx_queue),
370 rx_queue->added_count - rx_queue->removed_count);
371
372 out:
373 if (rx_queue->notified_count != rx_queue->added_count)
374 efx_nic_notify_rx_desc(rx_queue);
375}
376
377void efx_rx_slow_fill(unsigned long context)
378{
379 struct efx_rx_queue *rx_queue = (struct efx_rx_queue *)context;
380
381 /* Post an event to cause NAPI to run and refill the queue */
382 efx_nic_generate_fill_event(rx_queue);
383 ++rx_queue->slow_fill_count;
384}
385
386static void efx_rx_packet__check_len(struct efx_rx_queue *rx_queue,
387 struct efx_rx_buffer *rx_buf,
388 int len)
389{
390 struct efx_nic *efx = rx_queue->efx;
391 unsigned max_len = rx_buf->len - efx->type->rx_buffer_padding;
392
393 if (likely(len <= max_len))
394 return;
395
396 /* The packet must be discarded, but this is only a fatal error
397 * if the caller indicated it was
398 */
399 rx_buf->flags |= EFX_RX_PKT_DISCARD;
400
401 if ((len > rx_buf->len) && EFX_WORKAROUND_8071(efx)) {
402 if (net_ratelimit())
403 netif_err(efx, rx_err, efx->net_dev,
404 " RX queue %d seriously overlength "
405 "RX event (0x%x > 0x%x+0x%x). Leaking\n",
406 efx_rx_queue_index(rx_queue), len, max_len,
407 efx->type->rx_buffer_padding);
408 efx_schedule_reset(efx, RESET_TYPE_RX_RECOVERY);
409 } else {
410 if (net_ratelimit())
411 netif_err(efx, rx_err, efx->net_dev,
412 " RX queue %d overlength RX event "
413 "(0x%x > 0x%x)\n",
414 efx_rx_queue_index(rx_queue), len, max_len);
415 }
416
417 efx_rx_queue_channel(rx_queue)->n_rx_overlength++;
418}
419
420/* Pass a received packet up through GRO. GRO can handle pages
421 * regardless of checksum state and skbs with a good checksum.
422 */
423static void
424efx_rx_packet_gro(struct efx_channel *channel, struct efx_rx_buffer *rx_buf,
425 unsigned int n_frags, u8 *eh)
426{
427 struct napi_struct *napi = &channel->napi_str;
428 gro_result_t gro_result;
429 struct efx_nic *efx = channel->efx;
430 struct sk_buff *skb;
431
432 skb = napi_get_frags(napi);
433 if (unlikely(!skb)) {
434 while (n_frags--) {
435 put_page(rx_buf->page);
436 rx_buf->page = NULL;
437 rx_buf = efx_rx_buf_next(&channel->rx_queue, rx_buf);
438 }
439 return;
440 }
441
442 if (efx->net_dev->features & NETIF_F_RXHASH)
443 skb_set_hash(skb, efx_rx_buf_hash(efx, eh),
444 PKT_HASH_TYPE_L3);
445 skb->ip_summed = ((rx_buf->flags & EFX_RX_PKT_CSUMMED) ?
446 CHECKSUM_UNNECESSARY : CHECKSUM_NONE);
447
448 for (;;) {
449 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
450 rx_buf->page, rx_buf->page_offset,
451 rx_buf->len);
452 rx_buf->page = NULL;
453 skb->len += rx_buf->len;
454 if (skb_shinfo(skb)->nr_frags == n_frags)
455 break;
456
457 rx_buf = efx_rx_buf_next(&channel->rx_queue, rx_buf);
458 }
459
460 skb->data_len = skb->len;
461 skb->truesize += n_frags * efx->rx_buffer_truesize;
462
463 skb_record_rx_queue(skb, channel->rx_queue.core_index);
464
465 gro_result = napi_gro_frags(napi);
466 if (gro_result != GRO_DROP)
467 channel->irq_mod_score += 2;
468}
469
470/* Allocate and construct an SKB around page fragments */
471static struct sk_buff *efx_rx_mk_skb(struct efx_channel *channel,
472 struct efx_rx_buffer *rx_buf,
473 unsigned int n_frags,
474 u8 *eh, int hdr_len)
475{
476 struct efx_nic *efx = channel->efx;
477 struct sk_buff *skb;
478
479 /* Allocate an SKB to store the headers */
480 skb = netdev_alloc_skb(efx->net_dev,
481 efx->rx_ip_align + efx->rx_prefix_size +
482 hdr_len);
483 if (unlikely(skb == NULL))
484 return NULL;
485
486 EFX_BUG_ON_PARANOID(rx_buf->len < hdr_len);
487
488 memcpy(skb->data + efx->rx_ip_align, eh - efx->rx_prefix_size,
489 efx->rx_prefix_size + hdr_len);
490 skb_reserve(skb, efx->rx_ip_align + efx->rx_prefix_size);
491 __skb_put(skb, hdr_len);
492
493 /* Append the remaining page(s) onto the frag list */
494 if (rx_buf->len > hdr_len) {
495 rx_buf->page_offset += hdr_len;
496 rx_buf->len -= hdr_len;
497
498 for (;;) {
499 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
500 rx_buf->page, rx_buf->page_offset,
501 rx_buf->len);
502 rx_buf->page = NULL;
503 skb->len += rx_buf->len;
504 skb->data_len += rx_buf->len;
505 if (skb_shinfo(skb)->nr_frags == n_frags)
506 break;
507
508 rx_buf = efx_rx_buf_next(&channel->rx_queue, rx_buf);
509 }
510 } else {
511 __free_pages(rx_buf->page, efx->rx_buffer_order);
512 rx_buf->page = NULL;
513 n_frags = 0;
514 }
515
516 skb->truesize += n_frags * efx->rx_buffer_truesize;
517
518 /* Move past the ethernet header */
519 skb->protocol = eth_type_trans(skb, efx->net_dev);
520
521 return skb;
522}
523
524void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
525 unsigned int n_frags, unsigned int len, u16 flags)
526{
527 struct efx_nic *efx = rx_queue->efx;
528 struct efx_channel *channel = efx_rx_queue_channel(rx_queue);
529 struct efx_rx_buffer *rx_buf;
530
531 rx_buf = efx_rx_buffer(rx_queue, index);
532 rx_buf->flags |= flags;
533
534 /* Validate the number of fragments and completed length */
535 if (n_frags == 1) {
536 if (!(flags & EFX_RX_PKT_PREFIX_LEN))
537 efx_rx_packet__check_len(rx_queue, rx_buf, len);
538 } else if (unlikely(n_frags > EFX_RX_MAX_FRAGS) ||
539 unlikely(len <= (n_frags - 1) * efx->rx_dma_len) ||
540 unlikely(len > n_frags * efx->rx_dma_len) ||
541 unlikely(!efx->rx_scatter)) {
542 /* If this isn't an explicit discard request, either
543 * the hardware or the driver is broken.
544 */
545 WARN_ON(!(len == 0 && rx_buf->flags & EFX_RX_PKT_DISCARD));
546 rx_buf->flags |= EFX_RX_PKT_DISCARD;
547 }
548
549 netif_vdbg(efx, rx_status, efx->net_dev,
550 "RX queue %d received ids %x-%x len %d %s%s\n",
551 efx_rx_queue_index(rx_queue), index,
552 (index + n_frags - 1) & rx_queue->ptr_mask, len,
553 (rx_buf->flags & EFX_RX_PKT_CSUMMED) ? " [SUMMED]" : "",
554 (rx_buf->flags & EFX_RX_PKT_DISCARD) ? " [DISCARD]" : "");
555
556 /* Discard packet, if instructed to do so. Process the
557 * previous receive first.
558 */
559 if (unlikely(rx_buf->flags & EFX_RX_PKT_DISCARD)) {
560 efx_rx_flush_packet(channel);
561 efx_discard_rx_packet(channel, rx_buf, n_frags);
562 return;
563 }
564
565 if (n_frags == 1 && !(flags & EFX_RX_PKT_PREFIX_LEN))
566 rx_buf->len = len;
567
568 /* Release and/or sync the DMA mapping - assumes all RX buffers
569 * consumed in-order per RX queue.
570 */
571 efx_sync_rx_buffer(efx, rx_buf, rx_buf->len);
572
573 /* Prefetch nice and early so data will (hopefully) be in cache by
574 * the time we look at it.
575 */
576 prefetch(efx_rx_buf_va(rx_buf));
577
578 rx_buf->page_offset += efx->rx_prefix_size;
579 rx_buf->len -= efx->rx_prefix_size;
580
581 if (n_frags > 1) {
582 /* Release/sync DMA mapping for additional fragments.
583 * Fix length for last fragment.
584 */
585 unsigned int tail_frags = n_frags - 1;
586
587 for (;;) {
588 rx_buf = efx_rx_buf_next(rx_queue, rx_buf);
589 if (--tail_frags == 0)
590 break;
591 efx_sync_rx_buffer(efx, rx_buf, efx->rx_dma_len);
592 }
593 rx_buf->len = len - (n_frags - 1) * efx->rx_dma_len;
594 efx_sync_rx_buffer(efx, rx_buf, rx_buf->len);
595 }
596
597 /* All fragments have been DMA-synced, so recycle pages. */
598 rx_buf = efx_rx_buffer(rx_queue, index);
599 efx_recycle_rx_pages(channel, rx_buf, n_frags);
600
601 /* Pipeline receives so that we give time for packet headers to be
602 * prefetched into cache.
603 */
604 efx_rx_flush_packet(channel);
605 channel->rx_pkt_n_frags = n_frags;
606 channel->rx_pkt_index = index;
607}
608
609static void efx_rx_deliver(struct efx_channel *channel, u8 *eh,
610 struct efx_rx_buffer *rx_buf,
611 unsigned int n_frags)
612{
613 struct sk_buff *skb;
614 u16 hdr_len = min_t(u16, rx_buf->len, EFX_SKB_HEADERS);
615
616 skb = efx_rx_mk_skb(channel, rx_buf, n_frags, eh, hdr_len);
617 if (unlikely(skb == NULL)) {
618 efx_free_rx_buffer(rx_buf);
619 return;
620 }
621 skb_record_rx_queue(skb, channel->rx_queue.core_index);
622
623 /* Set the SKB flags */
624 skb_checksum_none_assert(skb);
625 if (likely(rx_buf->flags & EFX_RX_PKT_CSUMMED))
626 skb->ip_summed = CHECKSUM_UNNECESSARY;
627
628 efx_rx_skb_attach_timestamp(channel, skb);
629
630 if (channel->type->receive_skb)
631 if (channel->type->receive_skb(channel, skb))
632 return;
633
634 /* Pass the packet up */
635 netif_receive_skb(skb);
636}
637
638/* Handle a received packet. Second half: Touches packet payload. */
639void __efx_rx_packet(struct efx_channel *channel)
640{
641 struct efx_nic *efx = channel->efx;
642 struct efx_rx_buffer *rx_buf =
643 efx_rx_buffer(&channel->rx_queue, channel->rx_pkt_index);
644 u8 *eh = efx_rx_buf_va(rx_buf);
645
646 /* Read length from the prefix if necessary. This already
647 * excludes the length of the prefix itself.
648 */
649 if (rx_buf->flags & EFX_RX_PKT_PREFIX_LEN)
650 rx_buf->len = le16_to_cpup((__le16 *)
651 (eh + efx->rx_packet_len_offset));
652
653 /* If we're in loopback test, then pass the packet directly to the
654 * loopback layer, and free the rx_buf here
655 */
656 if (unlikely(efx->loopback_selftest)) {
657 efx_loopback_rx_packet(efx, eh, rx_buf->len);
658 efx_free_rx_buffer(rx_buf);
659 goto out;
660 }
661
662 if (unlikely(!(efx->net_dev->features & NETIF_F_RXCSUM)))
663 rx_buf->flags &= ~EFX_RX_PKT_CSUMMED;
664
665 if ((rx_buf->flags & EFX_RX_PKT_TCP) && !channel->type->receive_skb)
666 efx_rx_packet_gro(channel, rx_buf, channel->rx_pkt_n_frags, eh);
667 else
668 efx_rx_deliver(channel, eh, rx_buf, channel->rx_pkt_n_frags);
669out:
670 channel->rx_pkt_n_frags = 0;
671}
672
673int efx_probe_rx_queue(struct efx_rx_queue *rx_queue)
674{
675 struct efx_nic *efx = rx_queue->efx;
676 unsigned int entries;
677 int rc;
678
679 /* Create the smallest power-of-two aligned ring */
680 entries = max(roundup_pow_of_two(efx->rxq_entries), EFX_MIN_DMAQ_SIZE);
681 EFX_BUG_ON_PARANOID(entries > EFX_MAX_DMAQ_SIZE);
682 rx_queue->ptr_mask = entries - 1;
683
684 netif_dbg(efx, probe, efx->net_dev,
685 "creating RX queue %d size %#x mask %#x\n",
686 efx_rx_queue_index(rx_queue), efx->rxq_entries,
687 rx_queue->ptr_mask);
688
689 /* Allocate RX buffers */
690 rx_queue->buffer = kcalloc(entries, sizeof(*rx_queue->buffer),
691 GFP_KERNEL);
692 if (!rx_queue->buffer)
693 return -ENOMEM;
694
695 rc = efx_nic_probe_rx(rx_queue);
696 if (rc) {
697 kfree(rx_queue->buffer);
698 rx_queue->buffer = NULL;
699 }
700
701 return rc;
702}
703
704static void efx_init_rx_recycle_ring(struct efx_nic *efx,
705 struct efx_rx_queue *rx_queue)
706{
707 unsigned int bufs_in_recycle_ring, page_ring_size;
708
709 /* Set the RX recycle ring size */
710#ifdef CONFIG_PPC64
711 bufs_in_recycle_ring = EFX_RECYCLE_RING_SIZE_IOMMU;
712#else
713 if (iommu_present(&pci_bus_type))
714 bufs_in_recycle_ring = EFX_RECYCLE_RING_SIZE_IOMMU;
715 else
716 bufs_in_recycle_ring = EFX_RECYCLE_RING_SIZE_NOIOMMU;
717#endif /* CONFIG_PPC64 */
718
719 page_ring_size = roundup_pow_of_two(bufs_in_recycle_ring /
720 efx->rx_bufs_per_page);
721 rx_queue->page_ring = kcalloc(page_ring_size,
722 sizeof(*rx_queue->page_ring), GFP_KERNEL);
723 rx_queue->page_ptr_mask = page_ring_size - 1;
724}
725
726void efx_init_rx_queue(struct efx_rx_queue *rx_queue)
727{
728 struct efx_nic *efx = rx_queue->efx;
729 unsigned int max_fill, trigger, max_trigger;
730
731 netif_dbg(rx_queue->efx, drv, rx_queue->efx->net_dev,
732 "initialising RX queue %d\n", efx_rx_queue_index(rx_queue));
733
734 /* Initialise ptr fields */
735 rx_queue->added_count = 0;
736 rx_queue->notified_count = 0;
737 rx_queue->removed_count = 0;
738 rx_queue->min_fill = -1U;
739 efx_init_rx_recycle_ring(efx, rx_queue);
740
741 rx_queue->page_remove = 0;
742 rx_queue->page_add = rx_queue->page_ptr_mask + 1;
743 rx_queue->page_recycle_count = 0;
744 rx_queue->page_recycle_failed = 0;
745 rx_queue->page_recycle_full = 0;
746
747 /* Initialise limit fields */
748 max_fill = efx->rxq_entries - EFX_RXD_HEAD_ROOM;
749 max_trigger =
750 max_fill - efx->rx_pages_per_batch * efx->rx_bufs_per_page;
751 if (rx_refill_threshold != 0) {
752 trigger = max_fill * min(rx_refill_threshold, 100U) / 100U;
753 if (trigger > max_trigger)
754 trigger = max_trigger;
755 } else {
756 trigger = max_trigger;
757 }
758
759 rx_queue->max_fill = max_fill;
760 rx_queue->fast_fill_trigger = trigger;
761 rx_queue->refill_enabled = true;
762
763 /* Set up RX descriptor ring */
764 efx_nic_init_rx(rx_queue);
765}
766
767void efx_fini_rx_queue(struct efx_rx_queue *rx_queue)
768{
769 int i;
770 struct efx_nic *efx = rx_queue->efx;
771 struct efx_rx_buffer *rx_buf;
772
773 netif_dbg(rx_queue->efx, drv, rx_queue->efx->net_dev,
774 "shutting down RX queue %d\n", efx_rx_queue_index(rx_queue));
775
776 del_timer_sync(&rx_queue->slow_fill);
777
778 /* Release RX buffers from the current read ptr to the write ptr */
779 if (rx_queue->buffer) {
780 for (i = rx_queue->removed_count; i < rx_queue->added_count;
781 i++) {
782 unsigned index = i & rx_queue->ptr_mask;
783 rx_buf = efx_rx_buffer(rx_queue, index);
784 efx_fini_rx_buffer(rx_queue, rx_buf);
785 }
786 }
787
788 /* Unmap and release the pages in the recycle ring. Remove the ring. */
789 for (i = 0; i <= rx_queue->page_ptr_mask; i++) {
790 struct page *page = rx_queue->page_ring[i];
791 struct efx_rx_page_state *state;
792
793 if (page == NULL)
794 continue;
795
796 state = page_address(page);
797 dma_unmap_page(&efx->pci_dev->dev, state->dma_addr,
798 PAGE_SIZE << efx->rx_buffer_order,
799 DMA_FROM_DEVICE);
800 put_page(page);
801 }
802 kfree(rx_queue->page_ring);
803 rx_queue->page_ring = NULL;
804}
805
806void efx_remove_rx_queue(struct efx_rx_queue *rx_queue)
807{
808 netif_dbg(rx_queue->efx, drv, rx_queue->efx->net_dev,
809 "destroying RX queue %d\n", efx_rx_queue_index(rx_queue));
810
811 efx_nic_remove_rx(rx_queue);
812
813 kfree(rx_queue->buffer);
814 rx_queue->buffer = NULL;
815}
816
817
818module_param(rx_refill_threshold, uint, 0444);
819MODULE_PARM_DESC(rx_refill_threshold,
820 "RX descriptor ring refill threshold (%)");
821
822#ifdef CONFIG_RFS_ACCEL
823
824int efx_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
825 u16 rxq_index, u32 flow_id)
826{
827 struct efx_nic *efx = netdev_priv(net_dev);
828 struct efx_channel *channel;
829 struct efx_filter_spec spec;
830 const __be16 *ports;
831 __be16 ether_type;
832 int nhoff;
833 int rc;
834
835 /* The core RPS/RFS code has already parsed and validated
836 * VLAN, IP and transport headers. We assume they are in the
837 * header area.
838 */
839
840 if (skb->protocol == htons(ETH_P_8021Q)) {
841 const struct vlan_hdr *vh =
842 (const struct vlan_hdr *)skb->data;
843
844 /* We can't filter on the IP 5-tuple and the vlan
845 * together, so just strip the vlan header and filter
846 * on the IP part.
847 */
848 EFX_BUG_ON_PARANOID(skb_headlen(skb) < sizeof(*vh));
849 ether_type = vh->h_vlan_encapsulated_proto;
850 nhoff = sizeof(struct vlan_hdr);
851 } else {
852 ether_type = skb->protocol;
853 nhoff = 0;
854 }
855
856 if (ether_type != htons(ETH_P_IP) && ether_type != htons(ETH_P_IPV6))
857 return -EPROTONOSUPPORT;
858
859 efx_filter_init_rx(&spec, EFX_FILTER_PRI_HINT,
860 efx->rx_scatter ? EFX_FILTER_FLAG_RX_SCATTER : 0,
861 rxq_index);
862 spec.match_flags =
863 EFX_FILTER_MATCH_ETHER_TYPE | EFX_FILTER_MATCH_IP_PROTO |
864 EFX_FILTER_MATCH_LOC_HOST | EFX_FILTER_MATCH_LOC_PORT |
865 EFX_FILTER_MATCH_REM_HOST | EFX_FILTER_MATCH_REM_PORT;
866 spec.ether_type = ether_type;
867
868 if (ether_type == htons(ETH_P_IP)) {
869 const struct iphdr *ip =
870 (const struct iphdr *)(skb->data + nhoff);
871
872 EFX_BUG_ON_PARANOID(skb_headlen(skb) < nhoff + sizeof(*ip));
873 if (ip_is_fragment(ip))
874 return -EPROTONOSUPPORT;
875 spec.ip_proto = ip->protocol;
876 spec.rem_host[0] = ip->saddr;
877 spec.loc_host[0] = ip->daddr;
878 EFX_BUG_ON_PARANOID(skb_headlen(skb) < nhoff + 4 * ip->ihl + 4);
879 ports = (const __be16 *)(skb->data + nhoff + 4 * ip->ihl);
880 } else {
881 const struct ipv6hdr *ip6 =
882 (const struct ipv6hdr *)(skb->data + nhoff);
883
884 EFX_BUG_ON_PARANOID(skb_headlen(skb) <
885 nhoff + sizeof(*ip6) + 4);
886 spec.ip_proto = ip6->nexthdr;
887 memcpy(spec.rem_host, &ip6->saddr, sizeof(ip6->saddr));
888 memcpy(spec.loc_host, &ip6->daddr, sizeof(ip6->daddr));
889 ports = (const __be16 *)(ip6 + 1);
890 }
891
892 spec.rem_port = ports[0];
893 spec.loc_port = ports[1];
894
895 rc = efx->type->filter_rfs_insert(efx, &spec);
896 if (rc < 0)
897 return rc;
898
899 /* Remember this so we can check whether to expire the filter later */
900 efx->rps_flow_id[rc] = flow_id;
901 channel = efx_get_channel(efx, skb_get_rx_queue(skb));
902 ++channel->rfs_filters_added;
903
904 if (ether_type == htons(ETH_P_IP))
905 netif_info(efx, rx_status, efx->net_dev,
906 "steering %s %pI4:%u:%pI4:%u to queue %u [flow %u filter %d]\n",
907 (spec.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP",
908 spec.rem_host, ntohs(ports[0]), spec.loc_host,
909 ntohs(ports[1]), rxq_index, flow_id, rc);
910 else
911 netif_info(efx, rx_status, efx->net_dev,
912 "steering %s [%pI6]:%u:[%pI6]:%u to queue %u [flow %u filter %d]\n",
913 (spec.ip_proto == IPPROTO_TCP) ? "TCP" : "UDP",
914 spec.rem_host, ntohs(ports[0]), spec.loc_host,
915 ntohs(ports[1]), rxq_index, flow_id, rc);
916
917 return rc;
918}
919
920bool __efx_filter_rfs_expire(struct efx_nic *efx, unsigned int quota)
921{
922 bool (*expire_one)(struct efx_nic *efx, u32 flow_id, unsigned int index);
923 unsigned int index, size;
924 u32 flow_id;
925
926 if (!spin_trylock_bh(&efx->filter_lock))
927 return false;
928
929 expire_one = efx->type->filter_rfs_expire_one;
930 index = efx->rps_expire_index;
931 size = efx->type->max_rx_ip_filters;
932 while (quota--) {
933 flow_id = efx->rps_flow_id[index];
934 if (expire_one(efx, flow_id, index))
935 netif_info(efx, rx_status, efx->net_dev,
936 "expired filter %d [flow %u]\n",
937 index, flow_id);
938 if (++index == size)
939 index = 0;
940 }
941 efx->rps_expire_index = index;
942
943 spin_unlock_bh(&efx->filter_lock);
944 return true;
945}
946
947#endif /* CONFIG_RFS_ACCEL */
948
949/**
950 * efx_filter_is_mc_recipient - test whether spec is a multicast recipient
951 * @spec: Specification to test
952 *
953 * Return: %true if the specification is a non-drop RX filter that
954 * matches a local MAC address I/G bit value of 1 or matches a local
955 * IPv4 or IPv6 address value in the respective multicast address
956 * range. Otherwise %false.
957 */
958bool efx_filter_is_mc_recipient(const struct efx_filter_spec *spec)
959{
960 if (!(spec->flags & EFX_FILTER_FLAG_RX) ||
961 spec->dmaq_id == EFX_FILTER_RX_DMAQ_ID_DROP)
962 return false;
963
964 if (spec->match_flags &
965 (EFX_FILTER_MATCH_LOC_MAC | EFX_FILTER_MATCH_LOC_MAC_IG) &&
966 is_multicast_ether_addr(spec->loc_mac))
967 return true;
968
969 if ((spec->match_flags &
970 (EFX_FILTER_MATCH_ETHER_TYPE | EFX_FILTER_MATCH_LOC_HOST)) ==
971 (EFX_FILTER_MATCH_ETHER_TYPE | EFX_FILTER_MATCH_LOC_HOST)) {
972 if (spec->ether_type == htons(ETH_P_IP) &&
973 ipv4_is_multicast(spec->loc_host[0]))
974 return true;
975 if (spec->ether_type == htons(ETH_P_IPV6) &&
976 ((const u8 *)spec->loc_host)[0] == 0xff)
977 return true;
978 }
979
980 return false;
981}