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4a71df50 FB |
1 | /* |
2 | * drivers/s390/net/qeth_core_offl.c | |
3 | * | |
4 | * Copyright IBM Corp. 2007 | |
5 | * Author(s): Thomas Spatzier <tspat@de.ibm.com>, | |
6 | * Frank Blaschka <frank.blaschka@de.ibm.com> | |
7 | */ | |
8 | ||
9 | #include <linux/errno.h> | |
10 | #include <linux/ip.h> | |
11 | #include <linux/inetdevice.h> | |
12 | #include <linux/netdevice.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/tcp.h> | |
15 | #include <net/tcp.h> | |
16 | #include <linux/skbuff.h> | |
17 | ||
18 | #include <net/ip.h> | |
19 | #include <net/ip6_checksum.h> | |
20 | ||
21 | #include "qeth_core.h" | |
22 | #include "qeth_core_mpc.h" | |
23 | #include "qeth_core_offl.h" | |
24 | ||
25 | int qeth_eddp_check_buffers_for_context(struct qeth_qdio_out_q *queue, | |
26 | struct qeth_eddp_context *ctx) | |
27 | { | |
28 | int index = queue->next_buf_to_fill; | |
29 | int elements_needed = ctx->num_elements; | |
30 | int elements_in_buffer; | |
31 | int skbs_in_buffer; | |
32 | int buffers_needed = 0; | |
33 | ||
d11ba0c4 | 34 | QETH_DBF_TEXT(TRACE, 5, "eddpcbfc"); |
4a71df50 FB |
35 | while (elements_needed > 0) { |
36 | buffers_needed++; | |
37 | if (atomic_read(&queue->bufs[index].state) != | |
38 | QETH_QDIO_BUF_EMPTY) | |
39 | return -EBUSY; | |
40 | ||
41 | elements_in_buffer = QETH_MAX_BUFFER_ELEMENTS(queue->card) - | |
42 | queue->bufs[index].next_element_to_fill; | |
43 | skbs_in_buffer = elements_in_buffer / ctx->elements_per_skb; | |
44 | elements_needed -= skbs_in_buffer * ctx->elements_per_skb; | |
45 | index = (index + 1) % QDIO_MAX_BUFFERS_PER_Q; | |
46 | } | |
47 | return buffers_needed; | |
48 | } | |
49 | ||
50 | static void qeth_eddp_free_context(struct qeth_eddp_context *ctx) | |
51 | { | |
52 | int i; | |
53 | ||
d11ba0c4 | 54 | QETH_DBF_TEXT(TRACE, 5, "eddpfctx"); |
4a71df50 FB |
55 | for (i = 0; i < ctx->num_pages; ++i) |
56 | free_page((unsigned long)ctx->pages[i]); | |
57 | kfree(ctx->pages); | |
58 | kfree(ctx->elements); | |
59 | kfree(ctx); | |
60 | } | |
61 | ||
62 | ||
63 | static void qeth_eddp_get_context(struct qeth_eddp_context *ctx) | |
64 | { | |
65 | atomic_inc(&ctx->refcnt); | |
66 | } | |
67 | ||
68 | void qeth_eddp_put_context(struct qeth_eddp_context *ctx) | |
69 | { | |
70 | if (atomic_dec_return(&ctx->refcnt) == 0) | |
71 | qeth_eddp_free_context(ctx); | |
72 | } | |
73 | EXPORT_SYMBOL_GPL(qeth_eddp_put_context); | |
74 | ||
75 | void qeth_eddp_buf_release_contexts(struct qeth_qdio_out_buffer *buf) | |
76 | { | |
77 | struct qeth_eddp_context_reference *ref; | |
78 | ||
d11ba0c4 | 79 | QETH_DBF_TEXT(TRACE, 6, "eddprctx"); |
4a71df50 FB |
80 | while (!list_empty(&buf->ctx_list)) { |
81 | ref = list_entry(buf->ctx_list.next, | |
82 | struct qeth_eddp_context_reference, list); | |
83 | qeth_eddp_put_context(ref->ctx); | |
84 | list_del(&ref->list); | |
85 | kfree(ref); | |
86 | } | |
87 | } | |
88 | ||
89 | static int qeth_eddp_buf_ref_context(struct qeth_qdio_out_buffer *buf, | |
90 | struct qeth_eddp_context *ctx) | |
91 | { | |
92 | struct qeth_eddp_context_reference *ref; | |
93 | ||
d11ba0c4 | 94 | QETH_DBF_TEXT(TRACE, 6, "eddprfcx"); |
4a71df50 FB |
95 | ref = kmalloc(sizeof(struct qeth_eddp_context_reference), GFP_ATOMIC); |
96 | if (ref == NULL) | |
97 | return -ENOMEM; | |
98 | qeth_eddp_get_context(ctx); | |
99 | ref->ctx = ctx; | |
100 | list_add_tail(&ref->list, &buf->ctx_list); | |
101 | return 0; | |
102 | } | |
103 | ||
104 | int qeth_eddp_fill_buffer(struct qeth_qdio_out_q *queue, | |
105 | struct qeth_eddp_context *ctx, int index) | |
106 | { | |
107 | struct qeth_qdio_out_buffer *buf = NULL; | |
108 | struct qdio_buffer *buffer; | |
109 | int elements = ctx->num_elements; | |
110 | int element = 0; | |
111 | int flush_cnt = 0; | |
112 | int must_refcnt = 1; | |
113 | int i; | |
114 | ||
d11ba0c4 | 115 | QETH_DBF_TEXT(TRACE, 5, "eddpfibu"); |
4a71df50 FB |
116 | while (elements > 0) { |
117 | buf = &queue->bufs[index]; | |
118 | if (atomic_read(&buf->state) != QETH_QDIO_BUF_EMPTY) { | |
119 | /* normally this should not happen since we checked for | |
120 | * available elements in qeth_check_elements_for_context | |
121 | */ | |
122 | if (element == 0) | |
123 | return -EBUSY; | |
124 | else { | |
14cc21b6 FB |
125 | QETH_DBF_MESSAGE(2, "could only partially fill" |
126 | "eddp buffer!\n"); | |
4a71df50 FB |
127 | goto out; |
128 | } | |
129 | } | |
130 | /* check if the whole next skb fits into current buffer */ | |
131 | if ((QETH_MAX_BUFFER_ELEMENTS(queue->card) - | |
132 | buf->next_element_to_fill) | |
133 | < ctx->elements_per_skb){ | |
134 | /* no -> go to next buffer */ | |
135 | atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED); | |
136 | index = (index + 1) % QDIO_MAX_BUFFERS_PER_Q; | |
137 | flush_cnt++; | |
138 | /* new buffer, so we have to add ctx to buffer'ctx_list | |
139 | * and increment ctx's refcnt */ | |
140 | must_refcnt = 1; | |
141 | continue; | |
142 | } | |
143 | if (must_refcnt) { | |
144 | must_refcnt = 0; | |
145 | if (qeth_eddp_buf_ref_context(buf, ctx)) { | |
4a71df50 FB |
146 | goto out_check; |
147 | } | |
148 | } | |
149 | buffer = buf->buffer; | |
150 | /* fill one skb into buffer */ | |
151 | for (i = 0; i < ctx->elements_per_skb; ++i) { | |
152 | if (ctx->elements[element].length != 0) { | |
153 | buffer->element[buf->next_element_to_fill]. | |
154 | addr = ctx->elements[element].addr; | |
155 | buffer->element[buf->next_element_to_fill]. | |
156 | length = ctx->elements[element].length; | |
157 | buffer->element[buf->next_element_to_fill]. | |
158 | flags = ctx->elements[element].flags; | |
159 | buf->next_element_to_fill++; | |
160 | } | |
161 | element++; | |
162 | elements--; | |
163 | } | |
164 | } | |
165 | out_check: | |
166 | if (!queue->do_pack) { | |
d11ba0c4 | 167 | QETH_DBF_TEXT(TRACE, 6, "fillbfnp"); |
4a71df50 FB |
168 | /* set state to PRIMED -> will be flushed */ |
169 | if (buf->next_element_to_fill > 0) { | |
170 | atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED); | |
171 | flush_cnt++; | |
172 | } | |
173 | } else { | |
174 | if (queue->card->options.performance_stats) | |
175 | queue->card->perf_stats.skbs_sent_pack++; | |
d11ba0c4 | 176 | QETH_DBF_TEXT(TRACE, 6, "fillbfpa"); |
4a71df50 FB |
177 | if (buf->next_element_to_fill >= |
178 | QETH_MAX_BUFFER_ELEMENTS(queue->card)) { | |
179 | /* | |
180 | * packed buffer if full -> set state PRIMED | |
181 | * -> will be flushed | |
182 | */ | |
183 | atomic_set(&buf->state, QETH_QDIO_BUF_PRIMED); | |
184 | flush_cnt++; | |
185 | } | |
186 | } | |
187 | out: | |
188 | return flush_cnt; | |
189 | } | |
190 | ||
191 | static void qeth_eddp_create_segment_hdrs(struct qeth_eddp_context *ctx, | |
192 | struct qeth_eddp_data *eddp, int data_len) | |
193 | { | |
194 | u8 *page; | |
195 | int page_remainder; | |
196 | int page_offset; | |
197 | int pkt_len; | |
198 | struct qeth_eddp_element *element; | |
199 | ||
d11ba0c4 | 200 | QETH_DBF_TEXT(TRACE, 5, "eddpcrsh"); |
4a71df50 FB |
201 | page = ctx->pages[ctx->offset >> PAGE_SHIFT]; |
202 | page_offset = ctx->offset % PAGE_SIZE; | |
203 | element = &ctx->elements[ctx->num_elements]; | |
204 | pkt_len = eddp->nhl + eddp->thl + data_len; | |
205 | /* FIXME: layer2 and VLAN !!! */ | |
206 | if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2) | |
207 | pkt_len += ETH_HLEN; | |
208 | if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q)) | |
209 | pkt_len += VLAN_HLEN; | |
210 | /* does complete packet fit in current page ? */ | |
211 | page_remainder = PAGE_SIZE - page_offset; | |
212 | if (page_remainder < (sizeof(struct qeth_hdr) + pkt_len)) { | |
213 | /* no -> go to start of next page */ | |
214 | ctx->offset += page_remainder; | |
215 | page = ctx->pages[ctx->offset >> PAGE_SHIFT]; | |
216 | page_offset = 0; | |
217 | } | |
218 | memcpy(page + page_offset, &eddp->qh, sizeof(struct qeth_hdr)); | |
219 | element->addr = page + page_offset; | |
220 | element->length = sizeof(struct qeth_hdr); | |
221 | ctx->offset += sizeof(struct qeth_hdr); | |
222 | page_offset += sizeof(struct qeth_hdr); | |
223 | /* add mac header (?) */ | |
224 | if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2) { | |
225 | memcpy(page + page_offset, &eddp->mac, ETH_HLEN); | |
226 | element->length += ETH_HLEN; | |
227 | ctx->offset += ETH_HLEN; | |
228 | page_offset += ETH_HLEN; | |
229 | } | |
230 | /* add VLAN tag */ | |
231 | if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q)) { | |
232 | memcpy(page + page_offset, &eddp->vlan, VLAN_HLEN); | |
233 | element->length += VLAN_HLEN; | |
234 | ctx->offset += VLAN_HLEN; | |
235 | page_offset += VLAN_HLEN; | |
236 | } | |
237 | /* add network header */ | |
238 | memcpy(page + page_offset, (u8 *)&eddp->nh, eddp->nhl); | |
239 | element->length += eddp->nhl; | |
240 | eddp->nh_in_ctx = page + page_offset; | |
241 | ctx->offset += eddp->nhl; | |
242 | page_offset += eddp->nhl; | |
243 | /* add transport header */ | |
244 | memcpy(page + page_offset, (u8 *)&eddp->th, eddp->thl); | |
245 | element->length += eddp->thl; | |
246 | eddp->th_in_ctx = page + page_offset; | |
247 | ctx->offset += eddp->thl; | |
248 | } | |
249 | ||
250 | static void qeth_eddp_copy_data_tcp(char *dst, struct qeth_eddp_data *eddp, | |
251 | int len, __wsum *hcsum) | |
252 | { | |
253 | struct skb_frag_struct *frag; | |
254 | int left_in_frag; | |
255 | int copy_len; | |
256 | u8 *src; | |
257 | ||
d11ba0c4 | 258 | QETH_DBF_TEXT(TRACE, 5, "eddpcdtc"); |
4a71df50 FB |
259 | if (skb_shinfo(eddp->skb)->nr_frags == 0) { |
260 | skb_copy_from_linear_data_offset(eddp->skb, eddp->skb_offset, | |
261 | dst, len); | |
262 | *hcsum = csum_partial(eddp->skb->data + eddp->skb_offset, len, | |
263 | *hcsum); | |
264 | eddp->skb_offset += len; | |
265 | } else { | |
266 | while (len > 0) { | |
267 | if (eddp->frag < 0) { | |
268 | /* we're in skb->data */ | |
269 | left_in_frag = (eddp->skb->len - | |
270 | eddp->skb->data_len) | |
271 | - eddp->skb_offset; | |
272 | src = eddp->skb->data + eddp->skb_offset; | |
273 | } else { | |
274 | frag = &skb_shinfo(eddp->skb)->frags[ | |
275 | eddp->frag]; | |
276 | left_in_frag = frag->size - eddp->frag_offset; | |
277 | src = (u8 *)((page_to_pfn(frag->page) << | |
278 | PAGE_SHIFT) + frag->page_offset + | |
279 | eddp->frag_offset); | |
280 | } | |
281 | if (left_in_frag <= 0) { | |
282 | eddp->frag++; | |
283 | eddp->frag_offset = 0; | |
284 | continue; | |
285 | } | |
286 | copy_len = min(left_in_frag, len); | |
287 | memcpy(dst, src, copy_len); | |
288 | *hcsum = csum_partial(src, copy_len, *hcsum); | |
289 | dst += copy_len; | |
290 | eddp->frag_offset += copy_len; | |
291 | eddp->skb_offset += copy_len; | |
292 | len -= copy_len; | |
293 | } | |
294 | } | |
295 | } | |
296 | ||
297 | static void qeth_eddp_create_segment_data_tcp(struct qeth_eddp_context *ctx, | |
298 | struct qeth_eddp_data *eddp, int data_len, __wsum hcsum) | |
299 | { | |
300 | u8 *page; | |
301 | int page_remainder; | |
302 | int page_offset; | |
303 | struct qeth_eddp_element *element; | |
304 | int first_lap = 1; | |
305 | ||
d11ba0c4 | 306 | QETH_DBF_TEXT(TRACE, 5, "eddpcsdt"); |
4a71df50 FB |
307 | page = ctx->pages[ctx->offset >> PAGE_SHIFT]; |
308 | page_offset = ctx->offset % PAGE_SIZE; | |
309 | element = &ctx->elements[ctx->num_elements]; | |
310 | while (data_len) { | |
311 | page_remainder = PAGE_SIZE - page_offset; | |
312 | if (page_remainder < data_len) { | |
313 | qeth_eddp_copy_data_tcp(page + page_offset, eddp, | |
314 | page_remainder, &hcsum); | |
315 | element->length += page_remainder; | |
316 | if (first_lap) | |
317 | element->flags = SBAL_FLAGS_FIRST_FRAG; | |
318 | else | |
319 | element->flags = SBAL_FLAGS_MIDDLE_FRAG; | |
320 | ctx->num_elements++; | |
321 | element++; | |
322 | data_len -= page_remainder; | |
323 | ctx->offset += page_remainder; | |
324 | page = ctx->pages[ctx->offset >> PAGE_SHIFT]; | |
325 | page_offset = 0; | |
326 | element->addr = page + page_offset; | |
327 | } else { | |
328 | qeth_eddp_copy_data_tcp(page + page_offset, eddp, | |
329 | data_len, &hcsum); | |
330 | element->length += data_len; | |
331 | if (!first_lap) | |
332 | element->flags = SBAL_FLAGS_LAST_FRAG; | |
333 | ctx->num_elements++; | |
334 | ctx->offset += data_len; | |
335 | data_len = 0; | |
336 | } | |
337 | first_lap = 0; | |
338 | } | |
339 | ((struct tcphdr *)eddp->th_in_ctx)->check = csum_fold(hcsum); | |
340 | } | |
341 | ||
342 | static __wsum qeth_eddp_check_tcp4_hdr(struct qeth_eddp_data *eddp, | |
343 | int data_len) | |
344 | { | |
345 | __wsum phcsum; /* pseudo header checksum */ | |
346 | ||
d11ba0c4 | 347 | QETH_DBF_TEXT(TRACE, 5, "eddpckt4"); |
4a71df50 FB |
348 | eddp->th.tcp.h.check = 0; |
349 | /* compute pseudo header checksum */ | |
350 | phcsum = csum_tcpudp_nofold(eddp->nh.ip4.h.saddr, eddp->nh.ip4.h.daddr, | |
351 | eddp->thl + data_len, IPPROTO_TCP, 0); | |
352 | /* compute checksum of tcp header */ | |
353 | return csum_partial((u8 *)&eddp->th, eddp->thl, phcsum); | |
354 | } | |
355 | ||
356 | static __wsum qeth_eddp_check_tcp6_hdr(struct qeth_eddp_data *eddp, | |
357 | int data_len) | |
358 | { | |
359 | __be32 proto; | |
360 | __wsum phcsum; /* pseudo header checksum */ | |
361 | ||
d11ba0c4 | 362 | QETH_DBF_TEXT(TRACE, 5, "eddpckt6"); |
4a71df50 FB |
363 | eddp->th.tcp.h.check = 0; |
364 | /* compute pseudo header checksum */ | |
365 | phcsum = csum_partial((u8 *)&eddp->nh.ip6.h.saddr, | |
366 | sizeof(struct in6_addr), 0); | |
367 | phcsum = csum_partial((u8 *)&eddp->nh.ip6.h.daddr, | |
368 | sizeof(struct in6_addr), phcsum); | |
369 | proto = htonl(IPPROTO_TCP); | |
370 | phcsum = csum_partial((u8 *)&proto, sizeof(u32), phcsum); | |
371 | return phcsum; | |
372 | } | |
373 | ||
374 | static struct qeth_eddp_data *qeth_eddp_create_eddp_data(struct qeth_hdr *qh, | |
375 | u8 *nh, u8 nhl, u8 *th, u8 thl) | |
376 | { | |
377 | struct qeth_eddp_data *eddp; | |
378 | ||
d11ba0c4 | 379 | QETH_DBF_TEXT(TRACE, 5, "eddpcrda"); |
4a71df50 FB |
380 | eddp = kzalloc(sizeof(struct qeth_eddp_data), GFP_ATOMIC); |
381 | if (eddp) { | |
382 | eddp->nhl = nhl; | |
383 | eddp->thl = thl; | |
384 | memcpy(&eddp->qh, qh, sizeof(struct qeth_hdr)); | |
385 | memcpy(&eddp->nh, nh, nhl); | |
386 | memcpy(&eddp->th, th, thl); | |
387 | eddp->frag = -1; /* initially we're in skb->data */ | |
388 | } | |
389 | return eddp; | |
390 | } | |
391 | ||
392 | static void __qeth_eddp_fill_context_tcp(struct qeth_eddp_context *ctx, | |
393 | struct qeth_eddp_data *eddp) | |
394 | { | |
395 | struct tcphdr *tcph; | |
396 | int data_len; | |
397 | __wsum hcsum; | |
398 | ||
d11ba0c4 | 399 | QETH_DBF_TEXT(TRACE, 5, "eddpftcp"); |
4a71df50 FB |
400 | eddp->skb_offset = sizeof(struct qeth_hdr) + eddp->nhl + eddp->thl; |
401 | if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2) { | |
402 | eddp->skb_offset += sizeof(struct ethhdr); | |
403 | if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q)) | |
404 | eddp->skb_offset += VLAN_HLEN; | |
405 | } | |
406 | tcph = tcp_hdr(eddp->skb); | |
407 | while (eddp->skb_offset < eddp->skb->len) { | |
408 | data_len = min((int)skb_shinfo(eddp->skb)->gso_size, | |
409 | (int)(eddp->skb->len - eddp->skb_offset)); | |
410 | /* prepare qdio hdr */ | |
411 | if (eddp->qh.hdr.l2.id == QETH_HEADER_TYPE_LAYER2) { | |
412 | eddp->qh.hdr.l2.pkt_length = data_len + ETH_HLEN + | |
413 | eddp->nhl + eddp->thl; | |
414 | if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q)) | |
415 | eddp->qh.hdr.l2.pkt_length += VLAN_HLEN; | |
416 | } else | |
417 | eddp->qh.hdr.l3.length = data_len + eddp->nhl + | |
418 | eddp->thl; | |
419 | /* prepare ip hdr */ | |
420 | if (eddp->skb->protocol == htons(ETH_P_IP)) { | |
421 | eddp->nh.ip4.h.tot_len = htons(data_len + eddp->nhl + | |
422 | eddp->thl); | |
423 | eddp->nh.ip4.h.check = 0; | |
424 | eddp->nh.ip4.h.check = | |
425 | ip_fast_csum((u8 *)&eddp->nh.ip4.h, | |
426 | eddp->nh.ip4.h.ihl); | |
427 | } else | |
428 | eddp->nh.ip6.h.payload_len = htons(data_len + | |
429 | eddp->thl); | |
430 | /* prepare tcp hdr */ | |
431 | if (data_len == (eddp->skb->len - eddp->skb_offset)) { | |
432 | /* last segment -> set FIN and PSH flags */ | |
433 | eddp->th.tcp.h.fin = tcph->fin; | |
434 | eddp->th.tcp.h.psh = tcph->psh; | |
435 | } | |
436 | if (eddp->skb->protocol == htons(ETH_P_IP)) | |
437 | hcsum = qeth_eddp_check_tcp4_hdr(eddp, data_len); | |
438 | else | |
439 | hcsum = qeth_eddp_check_tcp6_hdr(eddp, data_len); | |
440 | /* fill the next segment into the context */ | |
441 | qeth_eddp_create_segment_hdrs(ctx, eddp, data_len); | |
442 | qeth_eddp_create_segment_data_tcp(ctx, eddp, data_len, hcsum); | |
443 | if (eddp->skb_offset >= eddp->skb->len) | |
444 | break; | |
445 | /* prepare headers for next round */ | |
446 | if (eddp->skb->protocol == htons(ETH_P_IP)) | |
447 | eddp->nh.ip4.h.id = htons(ntohs(eddp->nh.ip4.h.id) + 1); | |
448 | eddp->th.tcp.h.seq = htonl(ntohl(eddp->th.tcp.h.seq) + | |
449 | data_len); | |
450 | } | |
451 | } | |
452 | ||
453 | static int qeth_eddp_fill_context_tcp(struct qeth_eddp_context *ctx, | |
454 | struct sk_buff *skb, struct qeth_hdr *qhdr) | |
455 | { | |
456 | struct qeth_eddp_data *eddp = NULL; | |
457 | ||
d11ba0c4 | 458 | QETH_DBF_TEXT(TRACE, 5, "eddpficx"); |
4a71df50 FB |
459 | /* create our segmentation headers and copy original headers */ |
460 | if (skb->protocol == htons(ETH_P_IP)) | |
461 | eddp = qeth_eddp_create_eddp_data(qhdr, | |
462 | skb_network_header(skb), | |
463 | ip_hdrlen(skb), | |
464 | skb_transport_header(skb), | |
465 | tcp_hdrlen(skb)); | |
466 | else | |
467 | eddp = qeth_eddp_create_eddp_data(qhdr, | |
468 | skb_network_header(skb), | |
469 | sizeof(struct ipv6hdr), | |
470 | skb_transport_header(skb), | |
471 | tcp_hdrlen(skb)); | |
472 | ||
473 | if (eddp == NULL) { | |
d11ba0c4 | 474 | QETH_DBF_TEXT(TRACE, 2, "eddpfcnm"); |
4a71df50 FB |
475 | return -ENOMEM; |
476 | } | |
477 | if (qhdr->hdr.l2.id == QETH_HEADER_TYPE_LAYER2) { | |
478 | skb_set_mac_header(skb, sizeof(struct qeth_hdr)); | |
479 | memcpy(&eddp->mac, eth_hdr(skb), ETH_HLEN); | |
480 | if (eddp->mac.h_proto == __constant_htons(ETH_P_8021Q)) { | |
481 | eddp->vlan[0] = skb->protocol; | |
482 | eddp->vlan[1] = htons(vlan_tx_tag_get(skb)); | |
483 | } | |
484 | } | |
485 | /* the next flags will only be set on the last segment */ | |
486 | eddp->th.tcp.h.fin = 0; | |
487 | eddp->th.tcp.h.psh = 0; | |
488 | eddp->skb = skb; | |
489 | /* begin segmentation and fill context */ | |
490 | __qeth_eddp_fill_context_tcp(ctx, eddp); | |
491 | kfree(eddp); | |
492 | return 0; | |
493 | } | |
494 | ||
495 | static void qeth_eddp_calc_num_pages(struct qeth_eddp_context *ctx, | |
496 | struct sk_buff *skb, int hdr_len) | |
497 | { | |
498 | int skbs_per_page; | |
499 | ||
d11ba0c4 | 500 | QETH_DBF_TEXT(TRACE, 5, "eddpcanp"); |
4a71df50 FB |
501 | /* can we put multiple skbs in one page? */ |
502 | skbs_per_page = PAGE_SIZE / (skb_shinfo(skb)->gso_size + hdr_len); | |
503 | if (skbs_per_page > 1) { | |
504 | ctx->num_pages = (skb_shinfo(skb)->gso_segs + 1) / | |
505 | skbs_per_page + 1; | |
506 | ctx->elements_per_skb = 1; | |
507 | } else { | |
508 | /* no -> how many elements per skb? */ | |
509 | ctx->elements_per_skb = (skb_shinfo(skb)->gso_size + hdr_len + | |
510 | PAGE_SIZE) >> PAGE_SHIFT; | |
511 | ctx->num_pages = ctx->elements_per_skb * | |
512 | (skb_shinfo(skb)->gso_segs + 1); | |
513 | } | |
514 | ctx->num_elements = ctx->elements_per_skb * | |
515 | (skb_shinfo(skb)->gso_segs + 1); | |
516 | } | |
517 | ||
518 | static struct qeth_eddp_context *qeth_eddp_create_context_generic( | |
519 | struct qeth_card *card, struct sk_buff *skb, int hdr_len) | |
520 | { | |
521 | struct qeth_eddp_context *ctx = NULL; | |
522 | u8 *addr; | |
523 | int i; | |
524 | ||
d11ba0c4 | 525 | QETH_DBF_TEXT(TRACE, 5, "creddpcg"); |
4a71df50 FB |
526 | /* create the context and allocate pages */ |
527 | ctx = kzalloc(sizeof(struct qeth_eddp_context), GFP_ATOMIC); | |
528 | if (ctx == NULL) { | |
d11ba0c4 | 529 | QETH_DBF_TEXT(TRACE, 2, "ceddpcn1"); |
4a71df50 FB |
530 | return NULL; |
531 | } | |
532 | ctx->type = QETH_LARGE_SEND_EDDP; | |
533 | qeth_eddp_calc_num_pages(ctx, skb, hdr_len); | |
534 | if (ctx->elements_per_skb > QETH_MAX_BUFFER_ELEMENTS(card)) { | |
d11ba0c4 | 535 | QETH_DBF_TEXT(TRACE, 2, "ceddpcis"); |
4a71df50 FB |
536 | kfree(ctx); |
537 | return NULL; | |
538 | } | |
539 | ctx->pages = kcalloc(ctx->num_pages, sizeof(u8 *), GFP_ATOMIC); | |
540 | if (ctx->pages == NULL) { | |
d11ba0c4 | 541 | QETH_DBF_TEXT(TRACE, 2, "ceddpcn2"); |
4a71df50 FB |
542 | kfree(ctx); |
543 | return NULL; | |
544 | } | |
545 | for (i = 0; i < ctx->num_pages; ++i) { | |
546 | addr = (u8 *)get_zeroed_page(GFP_ATOMIC); | |
547 | if (addr == NULL) { | |
d11ba0c4 | 548 | QETH_DBF_TEXT(TRACE, 2, "ceddpcn3"); |
4a71df50 FB |
549 | ctx->num_pages = i; |
550 | qeth_eddp_free_context(ctx); | |
551 | return NULL; | |
552 | } | |
553 | ctx->pages[i] = addr; | |
554 | } | |
555 | ctx->elements = kcalloc(ctx->num_elements, | |
556 | sizeof(struct qeth_eddp_element), GFP_ATOMIC); | |
557 | if (ctx->elements == NULL) { | |
d11ba0c4 | 558 | QETH_DBF_TEXT(TRACE, 2, "ceddpcn4"); |
4a71df50 FB |
559 | qeth_eddp_free_context(ctx); |
560 | return NULL; | |
561 | } | |
562 | /* reset num_elements; will be incremented again in fill_buffer to | |
563 | * reflect number of actually used elements */ | |
564 | ctx->num_elements = 0; | |
565 | return ctx; | |
566 | } | |
567 | ||
568 | static struct qeth_eddp_context *qeth_eddp_create_context_tcp( | |
569 | struct qeth_card *card, struct sk_buff *skb, | |
570 | struct qeth_hdr *qhdr) | |
571 | { | |
572 | struct qeth_eddp_context *ctx = NULL; | |
573 | ||
d11ba0c4 | 574 | QETH_DBF_TEXT(TRACE, 5, "creddpct"); |
4a71df50 FB |
575 | if (skb->protocol == htons(ETH_P_IP)) |
576 | ctx = qeth_eddp_create_context_generic(card, skb, | |
577 | (sizeof(struct qeth_hdr) + | |
578 | ip_hdrlen(skb) + | |
579 | tcp_hdrlen(skb))); | |
580 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
581 | ctx = qeth_eddp_create_context_generic(card, skb, | |
582 | sizeof(struct qeth_hdr) + sizeof(struct ipv6hdr) + | |
583 | tcp_hdrlen(skb)); | |
584 | else | |
d11ba0c4 | 585 | QETH_DBF_TEXT(TRACE, 2, "cetcpinv"); |
4a71df50 FB |
586 | |
587 | if (ctx == NULL) { | |
d11ba0c4 | 588 | QETH_DBF_TEXT(TRACE, 2, "creddpnl"); |
4a71df50 FB |
589 | return NULL; |
590 | } | |
591 | if (qeth_eddp_fill_context_tcp(ctx, skb, qhdr)) { | |
d11ba0c4 | 592 | QETH_DBF_TEXT(TRACE, 2, "ceddptfe"); |
4a71df50 FB |
593 | qeth_eddp_free_context(ctx); |
594 | return NULL; | |
595 | } | |
596 | atomic_set(&ctx->refcnt, 1); | |
597 | return ctx; | |
598 | } | |
599 | ||
600 | struct qeth_eddp_context *qeth_eddp_create_context(struct qeth_card *card, | |
601 | struct sk_buff *skb, struct qeth_hdr *qhdr, | |
602 | unsigned char sk_protocol) | |
603 | { | |
d11ba0c4 | 604 | QETH_DBF_TEXT(TRACE, 5, "creddpc"); |
4a71df50 FB |
605 | switch (sk_protocol) { |
606 | case IPPROTO_TCP: | |
607 | return qeth_eddp_create_context_tcp(card, skb, qhdr); | |
608 | default: | |
d11ba0c4 | 609 | QETH_DBF_TEXT(TRACE, 2, "eddpinvp"); |
4a71df50 FB |
610 | } |
611 | return NULL; | |
612 | } | |
613 | EXPORT_SYMBOL_GPL(qeth_eddp_create_context); | |
614 | ||
615 | void qeth_tso_fill_header(struct qeth_card *card, struct qeth_hdr *qhdr, | |
616 | struct sk_buff *skb) | |
617 | { | |
618 | struct qeth_hdr_tso *hdr = (struct qeth_hdr_tso *)qhdr; | |
619 | struct tcphdr *tcph = tcp_hdr(skb); | |
620 | struct iphdr *iph = ip_hdr(skb); | |
621 | struct ipv6hdr *ip6h = ipv6_hdr(skb); | |
622 | ||
d11ba0c4 | 623 | QETH_DBF_TEXT(TRACE, 5, "tsofhdr"); |
4a71df50 FB |
624 | |
625 | /*fix header to TSO values ...*/ | |
626 | hdr->hdr.hdr.l3.id = QETH_HEADER_TYPE_TSO; | |
627 | /*set values which are fix for the first approach ...*/ | |
628 | hdr->ext.hdr_tot_len = (__u16) sizeof(struct qeth_hdr_ext_tso); | |
629 | hdr->ext.imb_hdr_no = 1; | |
630 | hdr->ext.hdr_type = 1; | |
631 | hdr->ext.hdr_version = 1; | |
632 | hdr->ext.hdr_len = 28; | |
633 | /*insert non-fix values */ | |
634 | hdr->ext.mss = skb_shinfo(skb)->gso_size; | |
635 | hdr->ext.dg_hdr_len = (__u16)(iph->ihl*4 + tcph->doff*4); | |
636 | hdr->ext.payload_len = (__u16)(skb->len - hdr->ext.dg_hdr_len - | |
637 | sizeof(struct qeth_hdr_tso)); | |
638 | tcph->check = 0; | |
639 | if (skb->protocol == ETH_P_IPV6) { | |
640 | ip6h->payload_len = 0; | |
641 | tcph->check = ~csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, | |
642 | 0, IPPROTO_TCP, 0); | |
643 | } else { | |
644 | /*OSA want us to set these values ...*/ | |
645 | tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, | |
646 | 0, IPPROTO_TCP, 0); | |
647 | iph->tot_len = 0; | |
648 | iph->check = 0; | |
649 | } | |
650 | } | |
651 | EXPORT_SYMBOL_GPL(qeth_tso_fill_header); | |
652 | ||
653 | void qeth_tx_csum(struct sk_buff *skb) | |
654 | { | |
655 | int tlen; | |
656 | if (skb->protocol == htons(ETH_P_IP)) { | |
657 | tlen = ntohs(ip_hdr(skb)->tot_len) - (ip_hdr(skb)->ihl << 2); | |
658 | switch (ip_hdr(skb)->protocol) { | |
659 | case IPPROTO_TCP: | |
660 | tcp_hdr(skb)->check = 0; | |
661 | tcp_hdr(skb)->check = csum_tcpudp_magic( | |
662 | ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, | |
663 | tlen, ip_hdr(skb)->protocol, | |
664 | skb_checksum(skb, skb_transport_offset(skb), | |
665 | tlen, 0)); | |
666 | break; | |
667 | case IPPROTO_UDP: | |
668 | udp_hdr(skb)->check = 0; | |
669 | udp_hdr(skb)->check = csum_tcpudp_magic( | |
670 | ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, | |
671 | tlen, ip_hdr(skb)->protocol, | |
672 | skb_checksum(skb, skb_transport_offset(skb), | |
673 | tlen, 0)); | |
674 | break; | |
675 | } | |
676 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
677 | switch (ipv6_hdr(skb)->nexthdr) { | |
678 | case IPPROTO_TCP: | |
679 | tcp_hdr(skb)->check = 0; | |
680 | tcp_hdr(skb)->check = csum_ipv6_magic( | |
681 | &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, | |
682 | ipv6_hdr(skb)->payload_len, | |
683 | ipv6_hdr(skb)->nexthdr, | |
684 | skb_checksum(skb, skb_transport_offset(skb), | |
685 | ipv6_hdr(skb)->payload_len, 0)); | |
686 | break; | |
687 | case IPPROTO_UDP: | |
688 | udp_hdr(skb)->check = 0; | |
689 | udp_hdr(skb)->check = csum_ipv6_magic( | |
690 | &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, | |
691 | ipv6_hdr(skb)->payload_len, | |
692 | ipv6_hdr(skb)->nexthdr, | |
693 | skb_checksum(skb, skb_transport_offset(skb), | |
694 | ipv6_hdr(skb)->payload_len, 0)); | |
695 | break; | |
696 | } | |
697 | } | |
698 | } | |
699 | EXPORT_SYMBOL_GPL(qeth_tx_csum); |