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Commit | Line | Data |
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1da177e4 | 1 | /* |
e018ba1f | 2 | * linux/drivers/s390/net/qeth_eddp.c |
1da177e4 LT |
3 | * |
4 | * Enhanced Device Driver Packing (EDDP) support for the qeth driver. | |
5 | * | |
6 | * Copyright 2004 IBM Corporation | |
7 | * | |
8 | * Author(s): Thomas Spatzier <tspat@de.ibm.com> | |
9 | * | |
1da177e4 | 10 | */ |
1da177e4 LT |
11 | #include <linux/errno.h> |
12 | #include <linux/ip.h> | |
13 | #include <linux/inetdevice.h> | |
14 | #include <linux/netdevice.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/tcp.h> | |
17 | #include <net/tcp.h> | |
18 | #include <linux/skbuff.h> | |
19 | ||
20 | #include <net/ip.h> | |
21 | ||
22 | #include "qeth.h" | |
23 | #include "qeth_mpc.h" | |
24 | #include "qeth_eddp.h" | |
25 | ||
26 | int | |
27 | qeth_eddp_check_buffers_for_context(struct qeth_qdio_out_q *queue, | |
28 | struct qeth_eddp_context *ctx) | |
29 | { | |
30 | int index = queue->next_buf_to_fill; | |
31 | int elements_needed = ctx->num_elements; | |
32 | int elements_in_buffer; | |
33 | int skbs_in_buffer; | |
34 | int buffers_needed = 0; | |
35 | ||
36 | QETH_DBF_TEXT(trace, 5, "eddpcbfc"); | |
37 | while(elements_needed > 0) { | |
38 | buffers_needed++; | |
39 | if (atomic_read(&queue->bufs[index].state) != | |
40 | QETH_QDIO_BUF_EMPTY) | |
41 | return -EBUSY; | |
42 | ||
43 | elements_in_buffer = QETH_MAX_BUFFER_ELEMENTS(queue->card) - | |
44 | queue->bufs[index].next_element_to_fill; | |
45 | skbs_in_buffer = elements_in_buffer / ctx->elements_per_skb; | |
46 | elements_needed -= skbs_in_buffer * ctx->elements_per_skb; | |
47 | index = (index + 1) % QDIO_MAX_BUFFERS_PER_Q; | |
48 | } | |
49 | return buffers_needed; | |
50 | } | |
51 | ||
4d284cac | 52 | static void |
1da177e4 LT |
53 | qeth_eddp_free_context(struct qeth_eddp_context *ctx) |
54 | { | |
55 | int i; | |
56 | ||
57 | QETH_DBF_TEXT(trace, 5, "eddpfctx"); | |
58 | for (i = 0; i < ctx->num_pages; ++i) | |
59 | free_page((unsigned long)ctx->pages[i]); | |
60 | kfree(ctx->pages); | |
66cc5d5a | 61 | kfree(ctx->elements); |
1da177e4 LT |
62 | kfree(ctx); |
63 | } | |
64 | ||
65 | ||
66 | static inline void | |
67 | qeth_eddp_get_context(struct qeth_eddp_context *ctx) | |
68 | { | |
69 | atomic_inc(&ctx->refcnt); | |
70 | } | |
71 | ||
72 | void | |
73 | qeth_eddp_put_context(struct qeth_eddp_context *ctx) | |
74 | { | |
75 | if (atomic_dec_return(&ctx->refcnt) == 0) | |
76 | qeth_eddp_free_context(ctx); | |
77 | } | |
78 | ||
79 | void | |
80 | qeth_eddp_buf_release_contexts(struct qeth_qdio_out_buffer *buf) | |
81 | { | |
82 | struct qeth_eddp_context_reference *ref; | |
e82b0f2c | 83 | |
1da177e4 LT |
84 | QETH_DBF_TEXT(trace, 6, "eddprctx"); |
85 | while (!list_empty(&buf->ctx_list)){ | |
86 | ref = list_entry(buf->ctx_list.next, | |
87 | struct qeth_eddp_context_reference, list); | |
88 | qeth_eddp_put_context(ref->ctx); | |
89 | list_del(&ref->list); | |
90 | kfree(ref); | |
91 | } | |
92 | } | |
93 | ||
4d284cac | 94 | static int |
1da177e4 LT |
95 | qeth_eddp_buf_ref_context(struct qeth_qdio_out_buffer *buf, |
96 | struct qeth_eddp_context *ctx) | |
97 | { | |
98 | struct qeth_eddp_context_reference *ref; | |
99 | ||
100 | QETH_DBF_TEXT(trace, 6, "eddprfcx"); | |
101 | ref = kmalloc(sizeof(struct qeth_eddp_context_reference), GFP_ATOMIC); | |
102 | if (ref == NULL) | |
103 | return -ENOMEM; | |
104 | qeth_eddp_get_context(ctx); | |
105 | ref->ctx = ctx; | |
106 | list_add_tail(&ref->list, &buf->ctx_list); | |
107 | return 0; | |
108 | } | |
109 | ||
110 | int | |
111 | qeth_eddp_fill_buffer(struct qeth_qdio_out_q *queue, | |
112 | struct qeth_eddp_context *ctx, | |
113 | int index) | |
114 | { | |
115 | struct qeth_qdio_out_buffer *buf = NULL; | |
116 | struct qdio_buffer *buffer; | |
117 | int elements = ctx->num_elements; | |
118 | int element = 0; | |
119 | int flush_cnt = 0; | |
120 | int must_refcnt = 1; | |
121 | int i; | |
122 | ||
123 | QETH_DBF_TEXT(trace, 5, "eddpfibu"); | |
124 | while (elements > 0) { | |
125 | buf = &queue->bufs[index]; | |
126 | if (atomic_read(&buf->state) != QETH_QDIO_BUF_EMPTY){ | |
127 | /* normally this should not happen since we checked for | |
128 | * available elements in qeth_check_elements_for_context | |
129 | */ | |
130 | if (element == 0) | |
131 | return -EBUSY; | |
132 | else { | |
133 | PRINT_WARN("could only partially fill eddp " | |
134 | "buffer!\n"); | |
135 | goto out; | |
136 | } | |
e82b0f2c | 137 | } |
1da177e4 LT |
138 | /* check if the whole next skb fits into current buffer */ |
139 | if ((QETH_MAX_BUFFER_ELEMENTS(queue->card) - | |
140 | buf->next_element_to_fill) | |
141 | < ctx->elements_per_skb){ | |
142 | /* no -> go to next buffer */ | |
143 | atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED); | |
144 | index = (index + 1) % QDIO_MAX_BUFFERS_PER_Q; | |
145 | flush_cnt++; | |
146 | /* new buffer, so we have to add ctx to buffer'ctx_list | |
147 | * and increment ctx's refcnt */ | |
148 | must_refcnt = 1; | |
149 | continue; | |
e82b0f2c | 150 | } |
1da177e4 LT |
151 | if (must_refcnt){ |
152 | must_refcnt = 0; | |
153 | if (qeth_eddp_buf_ref_context(buf, ctx)){ | |
154 | PRINT_WARN("no memory to create eddp context " | |
155 | "reference\n"); | |
156 | goto out_check; | |
157 | } | |
158 | } | |
159 | buffer = buf->buffer; | |
160 | /* fill one skb into buffer */ | |
161 | for (i = 0; i < ctx->elements_per_skb; ++i){ | |
162 | buffer->element[buf->next_element_to_fill].addr = | |
163 | ctx->elements[element].addr; | |
164 | buffer->element[buf->next_element_to_fill].length = | |
165 | ctx->elements[element].length; | |
166 | buffer->element[buf->next_element_to_fill].flags = | |
167 | ctx->elements[element].flags; | |
168 | buf->next_element_to_fill++; | |
169 | element++; | |
170 | elements--; | |
171 | } | |
172 | } | |
173 | out_check: | |
174 | if (!queue->do_pack) { | |
175 | QETH_DBF_TEXT(trace, 6, "fillbfnp"); | |
176 | /* set state to PRIMED -> will be flushed */ | |
177 | if (buf->next_element_to_fill > 0){ | |
178 | atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED); | |
179 | flush_cnt++; | |
180 | } | |
181 | } else { | |
09d2d38a FP |
182 | if (queue->card->options.performance_stats) |
183 | queue->card->perf_stats.skbs_sent_pack++; | |
1da177e4 LT |
184 | QETH_DBF_TEXT(trace, 6, "fillbfpa"); |
185 | if (buf->next_element_to_fill >= | |
186 | QETH_MAX_BUFFER_ELEMENTS(queue->card)) { | |
187 | /* | |
188 | * packed buffer if full -> set state PRIMED | |
189 | * -> will be flushed | |
190 | */ | |
191 | atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED); | |
192 | flush_cnt++; | |
193 | } | |
194 | } | |
195 | out: | |
196 | return flush_cnt; | |
197 | } | |
198 | ||
4d284cac | 199 | static void |
1da177e4 | 200 | qeth_eddp_create_segment_hdrs(struct qeth_eddp_context *ctx, |
05e08a2a | 201 | struct qeth_eddp_data *eddp, int data_len) |
1da177e4 LT |
202 | { |
203 | u8 *page; | |
204 | int page_remainder; | |
205 | int page_offset; | |
05e08a2a | 206 | int pkt_len; |
1da177e4 LT |
207 | struct qeth_eddp_element *element; |
208 | ||
209 | QETH_DBF_TEXT(trace, 5, "eddpcrsh"); | |
210 | page = ctx->pages[ctx->offset >> PAGE_SHIFT]; | |
211 | page_offset = ctx->offset % PAGE_SIZE; | |
212 | element = &ctx->elements[ctx->num_elements]; | |
05e08a2a | 213 | pkt_len = eddp->nhl + eddp->thl + data_len; |
1da177e4 LT |
214 | /* FIXME: layer2 and VLAN !!! */ |
215 | if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2) | |
05e08a2a | 216 | pkt_len += ETH_HLEN; |
1da177e4 | 217 | if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q)) |
05e08a2a FP |
218 | pkt_len += VLAN_HLEN; |
219 | /* does complete packet fit in current page ? */ | |
1da177e4 | 220 | page_remainder = PAGE_SIZE - page_offset; |
05e08a2a | 221 | if (page_remainder < (sizeof(struct qeth_hdr) + pkt_len)){ |
1da177e4 LT |
222 | /* no -> go to start of next page */ |
223 | ctx->offset += page_remainder; | |
224 | page = ctx->pages[ctx->offset >> PAGE_SHIFT]; | |
225 | page_offset = 0; | |
226 | } | |
227 | memcpy(page + page_offset, &eddp->qh, sizeof(struct qeth_hdr)); | |
228 | element->addr = page + page_offset; | |
229 | element->length = sizeof(struct qeth_hdr); | |
230 | ctx->offset += sizeof(struct qeth_hdr); | |
231 | page_offset += sizeof(struct qeth_hdr); | |
232 | /* add mac header (?) */ | |
233 | if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2){ | |
234 | memcpy(page + page_offset, &eddp->mac, ETH_HLEN); | |
235 | element->length += ETH_HLEN; | |
236 | ctx->offset += ETH_HLEN; | |
237 | page_offset += ETH_HLEN; | |
238 | } | |
239 | /* add VLAN tag */ | |
240 | if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q)){ | |
241 | memcpy(page + page_offset, &eddp->vlan, VLAN_HLEN); | |
242 | element->length += VLAN_HLEN; | |
243 | ctx->offset += VLAN_HLEN; | |
244 | page_offset += VLAN_HLEN; | |
245 | } | |
246 | /* add network header */ | |
247 | memcpy(page + page_offset, (u8 *)&eddp->nh, eddp->nhl); | |
248 | element->length += eddp->nhl; | |
249 | eddp->nh_in_ctx = page + page_offset; | |
250 | ctx->offset += eddp->nhl; | |
251 | page_offset += eddp->nhl; | |
252 | /* add transport header */ | |
253 | memcpy(page + page_offset, (u8 *)&eddp->th, eddp->thl); | |
254 | element->length += eddp->thl; | |
255 | eddp->th_in_ctx = page + page_offset; | |
256 | ctx->offset += eddp->thl; | |
257 | } | |
258 | ||
4d284cac | 259 | static void |
1da177e4 | 260 | qeth_eddp_copy_data_tcp(char *dst, struct qeth_eddp_data *eddp, int len, |
5a5a852e | 261 | __wsum *hcsum) |
1da177e4 LT |
262 | { |
263 | struct skb_frag_struct *frag; | |
264 | int left_in_frag; | |
265 | int copy_len; | |
266 | u8 *src; | |
e82b0f2c | 267 | |
1da177e4 LT |
268 | QETH_DBF_TEXT(trace, 5, "eddpcdtc"); |
269 | if (skb_shinfo(eddp->skb)->nr_frags == 0) { | |
d626f62b ACM |
270 | skb_copy_from_linear_data_offset(eddp->skb, eddp->skb_offset, |
271 | dst, len); | |
1da177e4 LT |
272 | *hcsum = csum_partial(eddp->skb->data + eddp->skb_offset, len, |
273 | *hcsum); | |
274 | eddp->skb_offset += len; | |
275 | } else { | |
276 | while (len > 0) { | |
277 | if (eddp->frag < 0) { | |
278 | /* we're in skb->data */ | |
05e08a2a | 279 | left_in_frag = (eddp->skb->len - eddp->skb->data_len) |
1da177e4 LT |
280 | - eddp->skb_offset; |
281 | src = eddp->skb->data + eddp->skb_offset; | |
282 | } else { | |
283 | frag = &skb_shinfo(eddp->skb)-> | |
284 | frags[eddp->frag]; | |
285 | left_in_frag = frag->size - eddp->frag_offset; | |
286 | src = (u8 *)( | |
287 | (page_to_pfn(frag->page) << PAGE_SHIFT)+ | |
288 | frag->page_offset + eddp->frag_offset); | |
289 | } | |
290 | if (left_in_frag <= 0) { | |
291 | eddp->frag++; | |
292 | eddp->frag_offset = 0; | |
293 | continue; | |
294 | } | |
295 | copy_len = min(left_in_frag, len); | |
296 | memcpy(dst, src, copy_len); | |
297 | *hcsum = csum_partial(src, copy_len, *hcsum); | |
298 | dst += copy_len; | |
299 | eddp->frag_offset += copy_len; | |
300 | eddp->skb_offset += copy_len; | |
301 | len -= copy_len; | |
302 | } | |
303 | } | |
304 | } | |
305 | ||
4d284cac | 306 | static void |
1da177e4 LT |
307 | qeth_eddp_create_segment_data_tcp(struct qeth_eddp_context *ctx, |
308 | struct qeth_eddp_data *eddp, int data_len, | |
5a5a852e | 309 | __wsum hcsum) |
1da177e4 LT |
310 | { |
311 | u8 *page; | |
312 | int page_remainder; | |
313 | int page_offset; | |
314 | struct qeth_eddp_element *element; | |
315 | int first_lap = 1; | |
316 | ||
317 | QETH_DBF_TEXT(trace, 5, "eddpcsdt"); | |
318 | page = ctx->pages[ctx->offset >> PAGE_SHIFT]; | |
319 | page_offset = ctx->offset % PAGE_SIZE; | |
320 | element = &ctx->elements[ctx->num_elements]; | |
321 | while (data_len){ | |
322 | page_remainder = PAGE_SIZE - page_offset; | |
323 | if (page_remainder < data_len){ | |
324 | qeth_eddp_copy_data_tcp(page + page_offset, eddp, | |
325 | page_remainder, &hcsum); | |
326 | element->length += page_remainder; | |
327 | if (first_lap) | |
328 | element->flags = SBAL_FLAGS_FIRST_FRAG; | |
329 | else | |
330 | element->flags = SBAL_FLAGS_MIDDLE_FRAG; | |
331 | ctx->num_elements++; | |
332 | element++; | |
333 | data_len -= page_remainder; | |
334 | ctx->offset += page_remainder; | |
335 | page = ctx->pages[ctx->offset >> PAGE_SHIFT]; | |
336 | page_offset = 0; | |
337 | element->addr = page + page_offset; | |
338 | } else { | |
339 | qeth_eddp_copy_data_tcp(page + page_offset, eddp, | |
340 | data_len, &hcsum); | |
341 | element->length += data_len; | |
342 | if (!first_lap) | |
343 | element->flags = SBAL_FLAGS_LAST_FRAG; | |
344 | ctx->num_elements++; | |
345 | ctx->offset += data_len; | |
346 | data_len = 0; | |
347 | } | |
348 | first_lap = 0; | |
349 | } | |
350 | ((struct tcphdr *)eddp->th_in_ctx)->check = csum_fold(hcsum); | |
351 | } | |
352 | ||
4d284cac | 353 | static __wsum |
1da177e4 LT |
354 | qeth_eddp_check_tcp4_hdr(struct qeth_eddp_data *eddp, int data_len) |
355 | { | |
5a5a852e | 356 | __wsum phcsum; /* pseudo header checksum */ |
1da177e4 LT |
357 | |
358 | QETH_DBF_TEXT(trace, 5, "eddpckt4"); | |
359 | eddp->th.tcp.h.check = 0; | |
360 | /* compute pseudo header checksum */ | |
361 | phcsum = csum_tcpudp_nofold(eddp->nh.ip4.h.saddr, eddp->nh.ip4.h.daddr, | |
362 | eddp->thl + data_len, IPPROTO_TCP, 0); | |
363 | /* compute checksum of tcp header */ | |
364 | return csum_partial((u8 *)&eddp->th, eddp->thl, phcsum); | |
365 | } | |
366 | ||
4d284cac | 367 | static __wsum |
1da177e4 LT |
368 | qeth_eddp_check_tcp6_hdr(struct qeth_eddp_data *eddp, int data_len) |
369 | { | |
5a5a852e AV |
370 | __be32 proto; |
371 | __wsum phcsum; /* pseudo header checksum */ | |
1da177e4 LT |
372 | |
373 | QETH_DBF_TEXT(trace, 5, "eddpckt6"); | |
374 | eddp->th.tcp.h.check = 0; | |
375 | /* compute pseudo header checksum */ | |
376 | phcsum = csum_partial((u8 *)&eddp->nh.ip6.h.saddr, | |
377 | sizeof(struct in6_addr), 0); | |
378 | phcsum = csum_partial((u8 *)&eddp->nh.ip6.h.daddr, | |
379 | sizeof(struct in6_addr), phcsum); | |
380 | proto = htonl(IPPROTO_TCP); | |
381 | phcsum = csum_partial((u8 *)&proto, sizeof(u32), phcsum); | |
382 | return phcsum; | |
383 | } | |
384 | ||
4d284cac | 385 | static struct qeth_eddp_data * |
1da177e4 LT |
386 | qeth_eddp_create_eddp_data(struct qeth_hdr *qh, u8 *nh, u8 nhl, u8 *th, u8 thl) |
387 | { | |
388 | struct qeth_eddp_data *eddp; | |
389 | ||
390 | QETH_DBF_TEXT(trace, 5, "eddpcrda"); | |
88abaab4 | 391 | eddp = kzalloc(sizeof(struct qeth_eddp_data), GFP_ATOMIC); |
1da177e4 | 392 | if (eddp){ |
1da177e4 LT |
393 | eddp->nhl = nhl; |
394 | eddp->thl = thl; | |
395 | memcpy(&eddp->qh, qh, sizeof(struct qeth_hdr)); | |
396 | memcpy(&eddp->nh, nh, nhl); | |
397 | memcpy(&eddp->th, th, thl); | |
398 | eddp->frag = -1; /* initially we're in skb->data */ | |
399 | } | |
400 | return eddp; | |
401 | } | |
402 | ||
4d284cac | 403 | static void |
1da177e4 LT |
404 | __qeth_eddp_fill_context_tcp(struct qeth_eddp_context *ctx, |
405 | struct qeth_eddp_data *eddp) | |
406 | { | |
407 | struct tcphdr *tcph; | |
408 | int data_len; | |
5a5a852e | 409 | __wsum hcsum; |
e82b0f2c | 410 | |
1da177e4 LT |
411 | QETH_DBF_TEXT(trace, 5, "eddpftcp"); |
412 | eddp->skb_offset = sizeof(struct qeth_hdr) + eddp->nhl + eddp->thl; | |
66cc5d5a FP |
413 | if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2) { |
414 | eddp->skb_offset += sizeof(struct ethhdr); | |
415 | #ifdef CONFIG_QETH_VLAN | |
416 | if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q)) | |
417 | eddp->skb_offset += VLAN_HLEN; | |
418 | #endif /* CONFIG_QETH_VLAN */ | |
419 | } | |
aa8223c7 | 420 | tcph = tcp_hdr(eddp->skb); |
1da177e4 | 421 | while (eddp->skb_offset < eddp->skb->len) { |
7967168c | 422 | data_len = min((int)skb_shinfo(eddp->skb)->gso_size, |
1da177e4 LT |
423 | (int)(eddp->skb->len - eddp->skb_offset)); |
424 | /* prepare qdio hdr */ | |
425 | if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2){ | |
426 | eddp->qh.hdr.l2.pkt_length = data_len + ETH_HLEN + | |
427 | eddp->nhl + eddp->thl - | |
428 | sizeof(struct qeth_hdr); | |
429 | #ifdef CONFIG_QETH_VLAN | |
430 | if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q)) | |
431 | eddp->qh.hdr.l2.pkt_length += VLAN_HLEN; | |
432 | #endif /* CONFIG_QETH_VLAN */ | |
433 | } else | |
434 | eddp->qh.hdr.l3.length = data_len + eddp->nhl + | |
435 | eddp->thl; | |
436 | /* prepare ip hdr */ | |
5a5a852e AV |
437 | if (eddp->skb->protocol == htons(ETH_P_IP)){ |
438 | eddp->nh.ip4.h.tot_len = htons(data_len + eddp->nhl + | |
439 | eddp->thl); | |
1da177e4 LT |
440 | eddp->nh.ip4.h.check = 0; |
441 | eddp->nh.ip4.h.check = | |
442 | ip_fast_csum((u8 *)&eddp->nh.ip4.h, | |
443 | eddp->nh.ip4.h.ihl); | |
444 | } else | |
5a5a852e | 445 | eddp->nh.ip6.h.payload_len = htons(data_len + eddp->thl); |
1da177e4 LT |
446 | /* prepare tcp hdr */ |
447 | if (data_len == (eddp->skb->len - eddp->skb_offset)){ | |
448 | /* last segment -> set FIN and PSH flags */ | |
449 | eddp->th.tcp.h.fin = tcph->fin; | |
450 | eddp->th.tcp.h.psh = tcph->psh; | |
451 | } | |
5a5a852e | 452 | if (eddp->skb->protocol == htons(ETH_P_IP)) |
1da177e4 LT |
453 | hcsum = qeth_eddp_check_tcp4_hdr(eddp, data_len); |
454 | else | |
455 | hcsum = qeth_eddp_check_tcp6_hdr(eddp, data_len); | |
456 | /* fill the next segment into the context */ | |
05e08a2a | 457 | qeth_eddp_create_segment_hdrs(ctx, eddp, data_len); |
1da177e4 LT |
458 | qeth_eddp_create_segment_data_tcp(ctx, eddp, data_len, hcsum); |
459 | if (eddp->skb_offset >= eddp->skb->len) | |
460 | break; | |
461 | /* prepare headers for next round */ | |
5a5a852e AV |
462 | if (eddp->skb->protocol == htons(ETH_P_IP)) |
463 | eddp->nh.ip4.h.id = htons(ntohs(eddp->nh.ip4.h.id) + 1); | |
464 | eddp->th.tcp.h.seq = htonl(ntohl(eddp->th.tcp.h.seq) + data_len); | |
1da177e4 LT |
465 | } |
466 | } | |
e82b0f2c | 467 | |
4d284cac | 468 | static int |
1da177e4 LT |
469 | qeth_eddp_fill_context_tcp(struct qeth_eddp_context *ctx, |
470 | struct sk_buff *skb, struct qeth_hdr *qhdr) | |
471 | { | |
472 | struct qeth_eddp_data *eddp = NULL; | |
e82b0f2c | 473 | |
1da177e4 LT |
474 | QETH_DBF_TEXT(trace, 5, "eddpficx"); |
475 | /* create our segmentation headers and copy original headers */ | |
5a5a852e | 476 | if (skb->protocol == htons(ETH_P_IP)) |
c9bdd4b5 ACM |
477 | eddp = qeth_eddp_create_eddp_data(qhdr, |
478 | skb_network_header(skb), | |
479 | ip_hdrlen(skb), | |
9c70220b | 480 | skb_transport_header(skb), |
ab6a5bb6 | 481 | tcp_hdrlen(skb)); |
1da177e4 | 482 | else |
0660e03f ACM |
483 | eddp = qeth_eddp_create_eddp_data(qhdr, |
484 | skb_network_header(skb), | |
485 | sizeof(struct ipv6hdr), | |
9c70220b | 486 | skb_transport_header(skb), |
ab6a5bb6 | 487 | tcp_hdrlen(skb)); |
1da177e4 LT |
488 | |
489 | if (eddp == NULL) { | |
490 | QETH_DBF_TEXT(trace, 2, "eddpfcnm"); | |
491 | return -ENOMEM; | |
492 | } | |
493 | if (qhdr->hdr.l2.id == QETH_HEADER_TYPE_LAYER2) { | |
48d49d0c | 494 | skb_set_mac_header(skb, sizeof(struct qeth_hdr)); |
1da177e4 LT |
495 | memcpy(&eddp->mac, eth_hdr(skb), ETH_HLEN); |
496 | #ifdef CONFIG_QETH_VLAN | |
497 | if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q)) { | |
5a5a852e | 498 | eddp->vlan[0] = skb->protocol; |
1da177e4 LT |
499 | eddp->vlan[1] = htons(vlan_tx_tag_get(skb)); |
500 | } | |
501 | #endif /* CONFIG_QETH_VLAN */ | |
502 | } | |
503 | /* the next flags will only be set on the last segment */ | |
504 | eddp->th.tcp.h.fin = 0; | |
505 | eddp->th.tcp.h.psh = 0; | |
506 | eddp->skb = skb; | |
507 | /* begin segmentation and fill context */ | |
508 | __qeth_eddp_fill_context_tcp(ctx, eddp); | |
509 | kfree(eddp); | |
510 | return 0; | |
511 | } | |
512 | ||
4d284cac | 513 | static void |
1da177e4 LT |
514 | qeth_eddp_calc_num_pages(struct qeth_eddp_context *ctx, struct sk_buff *skb, |
515 | int hdr_len) | |
516 | { | |
517 | int skbs_per_page; | |
e82b0f2c | 518 | |
1da177e4 LT |
519 | QETH_DBF_TEXT(trace, 5, "eddpcanp"); |
520 | /* can we put multiple skbs in one page? */ | |
7967168c | 521 | skbs_per_page = PAGE_SIZE / (skb_shinfo(skb)->gso_size + hdr_len); |
1da177e4 | 522 | if (skbs_per_page > 1){ |
7967168c | 523 | ctx->num_pages = (skb_shinfo(skb)->gso_segs + 1) / |
1da177e4 LT |
524 | skbs_per_page + 1; |
525 | ctx->elements_per_skb = 1; | |
526 | } else { | |
527 | /* no -> how many elements per skb? */ | |
7967168c | 528 | ctx->elements_per_skb = (skb_shinfo(skb)->gso_size + hdr_len + |
1da177e4 LT |
529 | PAGE_SIZE) >> PAGE_SHIFT; |
530 | ctx->num_pages = ctx->elements_per_skb * | |
7967168c | 531 | (skb_shinfo(skb)->gso_segs + 1); |
1da177e4 LT |
532 | } |
533 | ctx->num_elements = ctx->elements_per_skb * | |
7967168c | 534 | (skb_shinfo(skb)->gso_segs + 1); |
1da177e4 LT |
535 | } |
536 | ||
4d284cac | 537 | static struct qeth_eddp_context * |
1da177e4 LT |
538 | qeth_eddp_create_context_generic(struct qeth_card *card, struct sk_buff *skb, |
539 | int hdr_len) | |
540 | { | |
541 | struct qeth_eddp_context *ctx = NULL; | |
542 | u8 *addr; | |
543 | int i; | |
544 | ||
545 | QETH_DBF_TEXT(trace, 5, "creddpcg"); | |
546 | /* create the context and allocate pages */ | |
88abaab4 | 547 | ctx = kzalloc(sizeof(struct qeth_eddp_context), GFP_ATOMIC); |
1da177e4 LT |
548 | if (ctx == NULL){ |
549 | QETH_DBF_TEXT(trace, 2, "ceddpcn1"); | |
550 | return NULL; | |
551 | } | |
1da177e4 LT |
552 | ctx->type = QETH_LARGE_SEND_EDDP; |
553 | qeth_eddp_calc_num_pages(ctx, skb, hdr_len); | |
554 | if (ctx->elements_per_skb > QETH_MAX_BUFFER_ELEMENTS(card)){ | |
555 | QETH_DBF_TEXT(trace, 2, "ceddpcis"); | |
556 | kfree(ctx); | |
557 | return NULL; | |
558 | } | |
88abaab4 | 559 | ctx->pages = kcalloc(ctx->num_pages, sizeof(u8 *), GFP_ATOMIC); |
1da177e4 LT |
560 | if (ctx->pages == NULL){ |
561 | QETH_DBF_TEXT(trace, 2, "ceddpcn2"); | |
562 | kfree(ctx); | |
563 | return NULL; | |
564 | } | |
1da177e4 LT |
565 | for (i = 0; i < ctx->num_pages; ++i){ |
566 | addr = (u8 *)__get_free_page(GFP_ATOMIC); | |
567 | if (addr == NULL){ | |
568 | QETH_DBF_TEXT(trace, 2, "ceddpcn3"); | |
569 | ctx->num_pages = i; | |
570 | qeth_eddp_free_context(ctx); | |
571 | return NULL; | |
572 | } | |
573 | memset(addr, 0, PAGE_SIZE); | |
574 | ctx->pages[i] = addr; | |
575 | } | |
88abaab4 | 576 | ctx->elements = kcalloc(ctx->num_elements, |
1da177e4 LT |
577 | sizeof(struct qeth_eddp_element), GFP_ATOMIC); |
578 | if (ctx->elements == NULL){ | |
579 | QETH_DBF_TEXT(trace, 2, "ceddpcn4"); | |
580 | qeth_eddp_free_context(ctx); | |
581 | return NULL; | |
582 | } | |
1da177e4 LT |
583 | /* reset num_elements; will be incremented again in fill_buffer to |
584 | * reflect number of actually used elements */ | |
585 | ctx->num_elements = 0; | |
586 | return ctx; | |
587 | } | |
588 | ||
4d284cac | 589 | static struct qeth_eddp_context * |
1da177e4 LT |
590 | qeth_eddp_create_context_tcp(struct qeth_card *card, struct sk_buff *skb, |
591 | struct qeth_hdr *qhdr) | |
592 | { | |
593 | struct qeth_eddp_context *ctx = NULL; | |
e82b0f2c | 594 | |
1da177e4 | 595 | QETH_DBF_TEXT(trace, 5, "creddpct"); |
5a5a852e | 596 | if (skb->protocol == htons(ETH_P_IP)) |
1da177e4 | 597 | ctx = qeth_eddp_create_context_generic(card, skb, |
c9bdd4b5 ACM |
598 | (sizeof(struct qeth_hdr) + |
599 | ip_hdrlen(skb) + | |
ab6a5bb6 | 600 | tcp_hdrlen(skb))); |
5a5a852e | 601 | else if (skb->protocol == htons(ETH_P_IPV6)) |
1da177e4 LT |
602 | ctx = qeth_eddp_create_context_generic(card, skb, |
603 | sizeof(struct qeth_hdr) + sizeof(struct ipv6hdr) + | |
ab6a5bb6 | 604 | tcp_hdrlen(skb)); |
1da177e4 LT |
605 | else |
606 | QETH_DBF_TEXT(trace, 2, "cetcpinv"); | |
607 | ||
608 | if (ctx == NULL) { | |
609 | QETH_DBF_TEXT(trace, 2, "creddpnl"); | |
610 | return NULL; | |
611 | } | |
612 | if (qeth_eddp_fill_context_tcp(ctx, skb, qhdr)){ | |
613 | QETH_DBF_TEXT(trace, 2, "ceddptfe"); | |
614 | qeth_eddp_free_context(ctx); | |
615 | return NULL; | |
616 | } | |
617 | atomic_set(&ctx->refcnt, 1); | |
618 | return ctx; | |
619 | } | |
620 | ||
621 | struct qeth_eddp_context * | |
622 | qeth_eddp_create_context(struct qeth_card *card, struct sk_buff *skb, | |
623 | struct qeth_hdr *qhdr) | |
624 | { | |
625 | QETH_DBF_TEXT(trace, 5, "creddpc"); | |
626 | switch (skb->sk->sk_protocol){ | |
627 | case IPPROTO_TCP: | |
628 | return qeth_eddp_create_context_tcp(card, skb, qhdr); | |
629 | default: | |
630 | QETH_DBF_TEXT(trace, 2, "eddpinvp"); | |
631 | } | |
632 | return NULL; | |
633 | } |