drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_io.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2018 Chelsio Communications, Inc.
   4  *
   5  * Written by: Atul Gupta (atul.gupta@chelsio.com)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/list.h>
  10 #include <linux/workqueue.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/timer.h>
  13 #include <linux/notifier.h>
  14 #include <linux/inetdevice.h>
  15 #include <linux/ip.h>
  16 #include <linux/tcp.h>
  17 #include <linux/sched/signal.h>
  18 #include <net/tcp.h>
  19 #include <net/busy_poll.h>
  20 #include <crypto/aes.h>
  21
  22 #include "chtls.h"
  23 #include "chtls_cm.h"
  24
  25 static bool is_tls_tx(struct chtls_sock *csk)
  26 {
  27         return csk->tlshws.txkey >= 0;
  28 }
  29
  30 static bool is_tls_rx(struct chtls_sock *csk)
  31 {
  32         return csk->tlshws.rxkey >= 0;
  33 }
  34
  35 static int data_sgl_len(const struct sk_buff *skb)
  36 {
  37         unsigned int cnt;
  38
  39         cnt = skb_shinfo(skb)->nr_frags;
  40         return sgl_len(cnt) * 8;
  41 }
  42
  43 static int nos_ivs(struct sock *sk, unsigned int size)
  44 {
  45         struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
  46
  47         return DIV_ROUND_UP(size, csk->tlshws.mfs);
  48 }
  49
  50 static int set_ivs_imm(struct sock *sk, const struct sk_buff *skb)
  51 {
  52         int ivs_size = nos_ivs(sk, skb->len) * CIPHER_BLOCK_SIZE;
  53         int hlen = TLS_WR_CPL_LEN + data_sgl_len(skb);
  54
  55         if ((hlen + KEY_ON_MEM_SZ + ivs_size) <
  56             MAX_IMM_OFLD_TX_DATA_WR_LEN) {
  57                 ULP_SKB_CB(skb)->ulp.tls.iv = 1;
  58                 return 1;
  59         }
  60         ULP_SKB_CB(skb)->ulp.tls.iv = 0;
  61         return 0;
  62 }
  63
  64 static int max_ivs_size(struct sock *sk, int size)
  65 {
  66         return nos_ivs(sk, size) * CIPHER_BLOCK_SIZE;
  67 }
  68
  69 static int ivs_size(struct sock *sk, const struct sk_buff *skb)
  70 {
  71         return set_ivs_imm(sk, skb) ? (nos_ivs(sk, skb->len) *
  72                  CIPHER_BLOCK_SIZE) : 0;
  73 }
  74
  75 static int flowc_wr_credits(int nparams, int *flowclenp)
  76 {
  77         int flowclen16, flowclen;
  78
  79         flowclen = offsetof(struct fw_flowc_wr, mnemval[nparams]);
  80         flowclen16 = DIV_ROUND_UP(flowclen, 16);
  81         flowclen = flowclen16 * 16;
  82
  83         if (flowclenp)
  84                 *flowclenp = flowclen;
  85
  86         return flowclen16;
  87 }
  88
  89 static struct sk_buff *create_flowc_wr_skb(struct sock *sk,
  90                                            struct fw_flowc_wr *flowc,
  91                                            int flowclen)
  92 {
  93         struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
  94         struct sk_buff *skb;
  95
  96         skb = alloc_skb(flowclen, GFP_ATOMIC);
  97         if (!skb)
  98                 return NULL;
  99
 100         __skb_put_data(skb, flowc, flowclen);
 101         skb_set_queue_mapping(skb, (csk->txq_idx << 1) | CPL_PRIORITY_DATA);
 102
 103         return skb;
 104 }
 105
 106 static int send_flowc_wr(struct sock *sk, struct fw_flowc_wr *flowc,
 107                          int flowclen)
 108 {
 109         struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
 110         struct tcp_sock *tp = tcp_sk(sk);
 111         struct sk_buff *skb;
 112         int flowclen16;
 113         int ret;
 114
 115         flowclen16 = flowclen / 16;
 116
 117         if (csk_flag(sk, CSK_TX_DATA_SENT)) {
 118                 skb = create_flowc_wr_skb(sk, flowc, flowclen);
 119                 if (!skb)
 120                         return -ENOMEM;
 121
 122                 skb_entail(sk, skb,
 123                            ULPCB_FLAG_NO_HDR | ULPCB_FLAG_NO_APPEND);
 124                 return 0;
 125         }
 126
 127         ret = cxgb4_immdata_send(csk->egress_dev,
 128                                  csk->txq_idx,
 129                                  flowc, flowclen);
 130         if (!ret)
 131                 return flowclen16;
 132         skb = create_flowc_wr_skb(sk, flowc, flowclen);
 133         if (!skb)
 134                 return -ENOMEM;
 135         send_or_defer(sk, tp, skb, 0);
 136         return flowclen16;
 137 }
 138
 139 static u8 tcp_state_to_flowc_state(u8 state)
 140 {
 141         switch (state) {
 142         case TCP_ESTABLISHED:
 143                 return FW_FLOWC_MNEM_TCPSTATE_ESTABLISHED;
 144         case TCP_CLOSE_WAIT:
 145                 return FW_FLOWC_MNEM_TCPSTATE_CLOSEWAIT;
 146         case TCP_FIN_WAIT1:
 147                 return FW_FLOWC_MNEM_TCPSTATE_FINWAIT1;
 148         case TCP_CLOSING:
 149                 return FW_FLOWC_MNEM_TCPSTATE_CLOSING;
 150         case TCP_LAST_ACK:
 151                 return FW_FLOWC_MNEM_TCPSTATE_LASTACK;
 152         case TCP_FIN_WAIT2:
 153                 return FW_FLOWC_MNEM_TCPSTATE_FINWAIT2;
 154         }
 155
 156         return FW_FLOWC_MNEM_TCPSTATE_ESTABLISHED;
 157 }
 158
 159 int send_tx_flowc_wr(struct sock *sk, int compl,
 160                      u32 snd_nxt, u32 rcv_nxt)
 161 {
 162         struct flowc_packed {
 163                 struct fw_flowc_wr fc;
 164                 struct fw_flowc_mnemval mnemval[FW_FLOWC_MNEM_MAX];
 165         } __packed sflowc;
 166         int nparams, paramidx, flowclen16, flowclen;
 167         struct fw_flowc_wr *flowc;
 168         struct chtls_sock *csk;
 169         struct tcp_sock *tp;
 170
 171         csk = rcu_dereference_sk_user_data(sk);
 172         tp = tcp_sk(sk);
 173         memset(&sflowc, 0, sizeof(sflowc));
 174         flowc = &sflowc.fc;
 175
 176 #define FLOWC_PARAM(__m, __v) \
 177         do { \
 178                 flowc->mnemval[paramidx].mnemonic = FW_FLOWC_MNEM_##__m; \
 179                 flowc->mnemval[paramidx].val = cpu_to_be32(__v); \
 180                 paramidx++; \
 181         } while (0)
 182
 183         paramidx = 0;
 184
 185         FLOWC_PARAM(PFNVFN, FW_PFVF_CMD_PFN_V(csk->cdev->lldi->pf));
 186         FLOWC_PARAM(CH, csk->tx_chan);
 187         FLOWC_PARAM(PORT, csk->tx_chan);
 188         FLOWC_PARAM(IQID, csk->rss_qid);
 189         FLOWC_PARAM(SNDNXT, tp->snd_nxt);
 190         FLOWC_PARAM(RCVNXT, tp->rcv_nxt);
 191         FLOWC_PARAM(SNDBUF, csk->sndbuf);
 192         FLOWC_PARAM(MSS, tp->mss_cache);
 193         FLOWC_PARAM(TCPSTATE, tcp_state_to_flowc_state(sk->sk_state));
 194
 195         if (SND_WSCALE(tp))
 196                 FLOWC_PARAM(RCV_SCALE, SND_WSCALE(tp));
 197
 198         if (csk->ulp_mode == ULP_MODE_TLS)
 199                 FLOWC_PARAM(ULD_MODE, ULP_MODE_TLS);
 200
 201         if (csk->tlshws.fcplenmax)
 202                 FLOWC_PARAM(TXDATAPLEN_MAX, csk->tlshws.fcplenmax);
 203
 204         nparams = paramidx;
 205 #undef FLOWC_PARAM
 206
 207         flowclen16 = flowc_wr_credits(nparams, &flowclen);
 208         flowc->op_to_nparams =
 209                 cpu_to_be32(FW_WR_OP_V(FW_FLOWC_WR) |
 210                             FW_WR_COMPL_V(compl) |
 211                             FW_FLOWC_WR_NPARAMS_V(nparams));
 212         flowc->flowid_len16 = cpu_to_be32(FW_WR_LEN16_V(flowclen16) |
 213                                           FW_WR_FLOWID_V(csk->tid));
 214
 215         return send_flowc_wr(sk, flowc, flowclen);
 216 }
 217
 218 /* Copy IVs to WR */
 219 static int tls_copy_ivs(struct sock *sk, struct sk_buff *skb)
 220
 221 {
 222         struct chtls_sock *csk;
 223         unsigned char *iv_loc;
 224         struct chtls_hws *hws;
 225         unsigned char *ivs;
 226         u16 number_of_ivs;
 227         struct page *page;
 228         int err = 0;
 229
 230         csk = rcu_dereference_sk_user_data(sk);
 231         hws = &csk->tlshws;
 232         number_of_ivs = nos_ivs(sk, skb->len);
 233
 234         if (number_of_ivs > MAX_IVS_PAGE) {
 235                 pr_warn("MAX IVs in PAGE exceeded %d\n", number_of_ivs);
 236                 return -ENOMEM;
 237         }
 238
 239         /* generate the  IVs */
 240         ivs = kmalloc_array(CIPHER_BLOCK_SIZE, number_of_ivs, GFP_ATOMIC);
 241         if (!ivs)
 242                 return -ENOMEM;
 243         get_random_bytes(ivs, number_of_ivs * CIPHER_BLOCK_SIZE);
 244
 245         if (skb_ulp_tls_iv_imm(skb)) {
 246                 /* send the IVs as immediate data in the WR */
 247                 iv_loc = (unsigned char *)__skb_push(skb, number_of_ivs *
 248                                                 CIPHER_BLOCK_SIZE);
 249                 if (iv_loc)
 250                         memcpy(iv_loc, ivs, number_of_ivs * CIPHER_BLOCK_SIZE);
 251
 252                 hws->ivsize = number_of_ivs * CIPHER_BLOCK_SIZE;
 253         } else {
 254                 /* Send the IVs as sgls */
 255                 /* Already accounted IV DSGL for credits */
 256                 skb_shinfo(skb)->nr_frags--;
 257                 page = alloc_pages(sk->sk_allocation | __GFP_COMP, 0);
 258                 if (!page) {
 259                         pr_info("%s : Page allocation for IVs failed\n",
 260                                 __func__);
 261                         err = -ENOMEM;
 262                         goto out;
 263                 }
 264                 memcpy(page_address(page), ivs, number_of_ivs *
 265                        CIPHER_BLOCK_SIZE);
 266                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page, 0,
 267                                    number_of_ivs * CIPHER_BLOCK_SIZE);
 268                 hws->ivsize = 0;
 269         }
 270 out:
 271         kfree(ivs);
 272         return err;
 273 }
 274
 275 /* Copy Key to WR */
 276 static void tls_copy_tx_key(struct sock *sk, struct sk_buff *skb)
 277 {
 278         struct ulptx_sc_memrd *sc_memrd;
 279         struct chtls_sock *csk;
 280         struct chtls_dev *cdev;
 281         struct ulptx_idata *sc;
 282         struct chtls_hws *hws;
 283         u32 immdlen;
 284         int kaddr;
 285
 286         csk = rcu_dereference_sk_user_data(sk);
 287         hws = &csk->tlshws;
 288         cdev = csk->cdev;
 289
 290         immdlen = sizeof(*sc) + sizeof(*sc_memrd);
 291         kaddr = keyid_to_addr(cdev->kmap.start, hws->txkey);
 292         sc = (struct ulptx_idata *)__skb_push(skb, immdlen);
 293         if (sc) {
 294                 sc->cmd_more = htonl(ULPTX_CMD_V(ULP_TX_SC_NOOP));
 295                 sc->len = htonl(0);
 296                 sc_memrd = (struct ulptx_sc_memrd *)(sc + 1);
 297                 sc_memrd->cmd_to_len =
 298                                 htonl(ULPTX_CMD_V(ULP_TX_SC_MEMRD) |
 299                                 ULP_TX_SC_MORE_V(1) |
 300                                 ULPTX_LEN16_V(hws->keylen >> 4));
 301                 sc_memrd->addr = htonl(kaddr);
 302         }
 303 }
 304
 305 static u64 tlstx_incr_seqnum(struct chtls_hws *hws)
 306 {
 307         return hws->tx_seq_no++;
 308 }
 309
 310 static bool is_sg_request(const struct sk_buff *skb)
 311 {
 312         return skb->peeked ||
 313                 (skb->len > MAX_IMM_ULPTX_WR_LEN);
 314 }
 315
 316 /*
 317  * Returns true if an sk_buff carries urgent data.
 318  */
 319 static bool skb_urgent(struct sk_buff *skb)
 320 {
 321         return ULP_SKB_CB(skb)->flags & ULPCB_FLAG_URG;
 322 }
 323
 324 /* TLS content type for CPL SFO */
 325 static unsigned char tls_content_type(unsigned char content_type)
 326 {
 327         switch (content_type) {
 328         case TLS_HDR_TYPE_CCS:
 329                 return CPL_TX_TLS_SFO_TYPE_CCS;
 330         case TLS_HDR_TYPE_ALERT:
 331                 return CPL_TX_TLS_SFO_TYPE_ALERT;
 332         case TLS_HDR_TYPE_HANDSHAKE:
 333                 return CPL_TX_TLS_SFO_TYPE_HANDSHAKE;
 334         case TLS_HDR_TYPE_HEARTBEAT:
 335                 return CPL_TX_TLS_SFO_TYPE_HEARTBEAT;
 336         }
 337         return CPL_TX_TLS_SFO_TYPE_DATA;
 338 }
 339
 340 static void tls_tx_data_wr(struct sock *sk, struct sk_buff *skb,
 341                            int dlen, int tls_immd, u32 credits,
 342                            int expn, int pdus)
 343 {
 344         struct fw_tlstx_data_wr *req_wr;
 345         struct cpl_tx_tls_sfo *req_cpl;
 346         unsigned int wr_ulp_mode_force;
 347         struct tls_scmd *updated_scmd;
 348         unsigned char data_type;
 349         struct chtls_sock *csk;
 350         struct net_device *dev;
 351         struct chtls_hws *hws;
 352         struct tls_scmd *scmd;
 353         struct adapter *adap;
 354         unsigned char *req;
 355         int immd_len;
 356         int iv_imm;
 357         int len;
 358
 359         csk = rcu_dereference_sk_user_data(sk);
 360         iv_imm = skb_ulp_tls_iv_imm(skb);
 361         dev = csk->egress_dev;
 362         adap = netdev2adap(dev);
 363         hws = &csk->tlshws;
 364         scmd = &hws->scmd;
 365         len = dlen + expn;
 366
 367         dlen = (dlen < hws->mfs) ? dlen : hws->mfs;
 368         atomic_inc(&adap->chcr_stats.tls_pdu_tx);
 369
 370         updated_scmd = scmd;
 371         updated_scmd->seqno_numivs &= 0xffffff80;
 372         updated_scmd->seqno_numivs |= SCMD_NUM_IVS_V(pdus);
 373         hws->scmd = *updated_scmd;
 374
 375         req = (unsigned char *)__skb_push(skb, sizeof(struct cpl_tx_tls_sfo));
 376         req_cpl = (struct cpl_tx_tls_sfo *)req;
 377         req = (unsigned char *)__skb_push(skb, (sizeof(struct
 378                                 fw_tlstx_data_wr)));
 379
 380         req_wr = (struct fw_tlstx_data_wr *)req;
 381         immd_len = (tls_immd ? dlen : 0);
 382         req_wr->op_to_immdlen =
 383                 htonl(FW_WR_OP_V(FW_TLSTX_DATA_WR) |
 384                 FW_TLSTX_DATA_WR_COMPL_V(1) |
 385                 FW_TLSTX_DATA_WR_IMMDLEN_V(immd_len));
 386         req_wr->flowid_len16 = htonl(FW_TLSTX_DATA_WR_FLOWID_V(csk->tid) |
 387                                      FW_TLSTX_DATA_WR_LEN16_V(credits));
 388         wr_ulp_mode_force = TX_ULP_MODE_V(ULP_MODE_TLS);
 389
 390         if (is_sg_request(skb))
 391                 wr_ulp_mode_force |= FW_OFLD_TX_DATA_WR_ALIGNPLD_F |
 392                         ((tcp_sk(sk)->nonagle & TCP_NAGLE_OFF) ? 0 :
 393                         FW_OFLD_TX_DATA_WR_SHOVE_F);
 394
 395         req_wr->lsodisable_to_flags =
 396                         htonl(TX_ULP_MODE_V(ULP_MODE_TLS) |
 397                               TX_URG_V(skb_urgent(skb)) |
 398                               T6_TX_FORCE_F | wr_ulp_mode_force |
 399                               TX_SHOVE_V((!csk_flag(sk, CSK_TX_MORE_DATA)) &&
 400                                          skb_queue_empty(&csk->txq)));
 401
 402         req_wr->ctxloc_to_exp =
 403                         htonl(FW_TLSTX_DATA_WR_NUMIVS_V(pdus) |
 404                               FW_TLSTX_DATA_WR_EXP_V(expn) |
 405                               FW_TLSTX_DATA_WR_CTXLOC_V(CHTLS_KEY_CONTEXT_DDR) |
 406                               FW_TLSTX_DATA_WR_IVDSGL_V(!iv_imm) |
 407                               FW_TLSTX_DATA_WR_KEYSIZE_V(hws->keylen >> 4));
 408
 409         /* Fill in the length */
 410         req_wr->plen = htonl(len);
 411         req_wr->mfs = htons(hws->mfs);
 412         req_wr->adjustedplen_pkd =
 413                 htons(FW_TLSTX_DATA_WR_ADJUSTEDPLEN_V(hws->adjustlen));
 414         req_wr->expinplenmax_pkd =
 415                 htons(FW_TLSTX_DATA_WR_EXPINPLENMAX_V(hws->expansion));
 416         req_wr->pdusinplenmax_pkd =
 417                 FW_TLSTX_DATA_WR_PDUSINPLENMAX_V(hws->pdus);
 418         req_wr->r10 = 0;
 419
 420         data_type = tls_content_type(ULP_SKB_CB(skb)->ulp.tls.type);
 421         req_cpl->op_to_seg_len = htonl(CPL_TX_TLS_SFO_OPCODE_V(CPL_TX_TLS_SFO) |
 422                                        CPL_TX_TLS_SFO_DATA_TYPE_V(data_type) |
 423                                        CPL_TX_TLS_SFO_CPL_LEN_V(2) |
 424                                        CPL_TX_TLS_SFO_SEG_LEN_V(dlen));
 425         req_cpl->pld_len = htonl(len - expn);
 426
 427         req_cpl->type_protover = htonl(CPL_TX_TLS_SFO_TYPE_V
 428                 ((data_type == CPL_TX_TLS_SFO_TYPE_HEARTBEAT) ?
 429                 TLS_HDR_TYPE_HEARTBEAT : 0) |
 430                 CPL_TX_TLS_SFO_PROTOVER_V(0));
 431
 432         /* create the s-command */
 433         req_cpl->r1_lo = 0;
 434         req_cpl->seqno_numivs  = cpu_to_be32(hws->scmd.seqno_numivs);
 435         req_cpl->ivgen_hdrlen = cpu_to_be32(hws->scmd.ivgen_hdrlen);
 436         req_cpl->scmd1 = cpu_to_be64(tlstx_incr_seqnum(hws));
 437 }
 438
 439 /*
 440  * Calculate the TLS data expansion size
 441  */
 442 static int chtls_expansion_size(struct sock *sk, int data_len,
 443                                 int fullpdu,
 444                                 unsigned short *pducnt)
 445 {
 446         struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
 447         struct chtls_hws *hws = &csk->tlshws;
 448         struct tls_scmd *scmd = &hws->scmd;
 449         int fragsize = hws->mfs;
 450         int expnsize = 0;
 451         int fragleft;
 452         int fragcnt;
 453         int expppdu;
 454
 455         if (SCMD_CIPH_MODE_G(scmd->seqno_numivs) ==
 456             SCMD_CIPH_MODE_AES_GCM) {
 457                 expppdu = GCM_TAG_SIZE + AEAD_EXPLICIT_DATA_SIZE +
 458                           TLS_HEADER_LENGTH;
 459
 460                 if (fullpdu) {
 461                         *pducnt = data_len / (expppdu + fragsize);
 462                         if (*pducnt > 32)
 463                                 *pducnt = 32;
 464                         else if (!*pducnt)
 465                                 *pducnt = 1;
 466                         expnsize = (*pducnt) * expppdu;
 467                         return expnsize;
 468                 }
 469                 fragcnt = (data_len / fragsize);
 470                 expnsize =  fragcnt * expppdu;
 471                 fragleft = data_len % fragsize;
 472                 if (fragleft > 0)
 473                         expnsize += expppdu;
 474         }
 475         return expnsize;
 476 }
 477
 478 /* WR with IV, KEY and CPL SFO added */
 479 static void make_tlstx_data_wr(struct sock *sk, struct sk_buff *skb,
 480                                int tls_tx_imm, int tls_len, u32 credits)
 481 {
 482         unsigned short pdus_per_ulp = 0;
 483         struct chtls_sock *csk;
 484         struct chtls_hws *hws;
 485         int expn_sz;
 486         int pdus;
 487
 488         csk = rcu_dereference_sk_user_data(sk);
 489         hws = &csk->tlshws;
 490         pdus = DIV_ROUND_UP(tls_len, hws->mfs);
 491         expn_sz = chtls_expansion_size(sk, tls_len, 0, NULL);
 492         if (!hws->compute) {
 493                 hws->expansion = chtls_expansion_size(sk,
 494                                                       hws->fcplenmax,
 495                                                       1, &pdus_per_ulp);
 496                 hws->pdus = pdus_per_ulp;
 497                 hws->adjustlen = hws->pdus *
 498                         ((hws->expansion / hws->pdus) + hws->mfs);
 499                 hws->compute = 1;
 500         }
 501         if (tls_copy_ivs(sk, skb))
 502                 return;
 503         tls_copy_tx_key(sk, skb);
 504         tls_tx_data_wr(sk, skb, tls_len, tls_tx_imm, credits, expn_sz, pdus);
 505         hws->tx_seq_no += (pdus - 1);
 506 }
 507
 508 static void make_tx_data_wr(struct sock *sk, struct sk_buff *skb,
 509                             unsigned int immdlen, int len,
 510                             u32 credits, u32 compl)
 511 {
 512         struct fw_ofld_tx_data_wr *req;
 513         unsigned int wr_ulp_mode_force;
 514         struct chtls_sock *csk;
 515         unsigned int opcode;
 516
 517         csk = rcu_dereference_sk_user_data(sk);
 518         opcode = FW_OFLD_TX_DATA_WR;
 519
 520         req = (struct fw_ofld_tx_data_wr *)__skb_push(skb, sizeof(*req));
 521         req->op_to_immdlen = htonl(WR_OP_V(opcode) |
 522                                 FW_WR_COMPL_V(compl) |
 523                                 FW_WR_IMMDLEN_V(immdlen));
 524         req->flowid_len16 = htonl(FW_WR_FLOWID_V(csk->tid) |
 525                                 FW_WR_LEN16_V(credits));
 526
 527         wr_ulp_mode_force = TX_ULP_MODE_V(csk->ulp_mode);
 528         if (is_sg_request(skb))
 529                 wr_ulp_mode_force |= FW_OFLD_TX_DATA_WR_ALIGNPLD_F |
 530                         ((tcp_sk(sk)->nonagle & TCP_NAGLE_OFF) ? 0 :
 531                                 FW_OFLD_TX_DATA_WR_SHOVE_F);
 532
 533         req->tunnel_to_proxy = htonl(wr_ulp_mode_force |
 534                         TX_URG_V(skb_urgent(skb)) |
 535                         TX_SHOVE_V((!csk_flag(sk, CSK_TX_MORE_DATA)) &&
 536                                    skb_queue_empty(&csk->txq)));
 537         req->plen = htonl(len);
 538 }
 539
 540 static int chtls_wr_size(struct chtls_sock *csk, const struct sk_buff *skb,
 541                          bool size)
 542 {
 543         int wr_size;
 544
 545         wr_size = TLS_WR_CPL_LEN;
 546         wr_size += KEY_ON_MEM_SZ;
 547         wr_size += ivs_size(csk->sk, skb);
 548
 549         if (size)
 550                 return wr_size;
 551
 552         /* frags counted for IV dsgl */
 553         if (!skb_ulp_tls_iv_imm(skb))
 554                 skb_shinfo(skb)->nr_frags++;
 555
 556         return wr_size;
 557 }
 558
 559 static bool is_ofld_imm(struct chtls_sock *csk, const struct sk_buff *skb)
 560 {
 561         int length = skb->len;
 562
 563         if (skb->peeked || skb->len > MAX_IMM_ULPTX_WR_LEN)
 564                 return false;
 565
 566         if (likely(ULP_SKB_CB(skb)->flags & ULPCB_FLAG_NEED_HDR)) {
 567                 /* Check TLS header len for Immediate */
 568                 if (csk->ulp_mode == ULP_MODE_TLS &&
 569                     skb_ulp_tls_inline(skb))
 570                         length += chtls_wr_size(csk, skb, true);
 571                 else
 572                         length += sizeof(struct fw_ofld_tx_data_wr);
 573
 574                 return length <= MAX_IMM_OFLD_TX_DATA_WR_LEN;
 575         }
 576         return true;
 577 }
 578
 579 static unsigned int calc_tx_flits(const struct sk_buff *skb,
 580                                   unsigned int immdlen)
 581 {
 582         unsigned int flits, cnt;
 583
 584         flits = immdlen / 8;   /* headers */
 585         cnt = skb_shinfo(skb)->nr_frags;
 586         if (skb_tail_pointer(skb) != skb_transport_header(skb))
 587                 cnt++;
 588         return flits + sgl_len(cnt);
 589 }
 590
 591 static void arp_failure_discard(void *handle, struct sk_buff *skb)
 592 {
 593         kfree_skb(skb);
 594 }
 595
 596 int chtls_push_frames(struct chtls_sock *csk, int comp)
 597 {
 598         struct chtls_hws *hws = &csk->tlshws;
 599         struct tcp_sock *tp;
 600         struct sk_buff *skb;
 601         int total_size = 0;
 602         struct sock *sk;
 603         int wr_size;
 604
 605         wr_size = sizeof(struct fw_ofld_tx_data_wr);
 606         sk = csk->sk;
 607         tp = tcp_sk(sk);
 608
 609         if (unlikely(sk_in_state(sk, TCPF_SYN_SENT | TCPF_CLOSE)))
 610                 return 0;
 611
 612         if (unlikely(csk_flag(sk, CSK_ABORT_SHUTDOWN)))
 613                 return 0;
 614
 615         while (csk->wr_credits && (skb = skb_peek(&csk->txq)) &&
 616                (!(ULP_SKB_CB(skb)->flags & ULPCB_FLAG_HOLD) ||
 617                 skb_queue_len(&csk->txq) > 1)) {
 618                 unsigned int credit_len = skb->len;
 619                 unsigned int credits_needed;
 620                 unsigned int completion = 0;
 621                 int tls_len = skb->len;/* TLS data len before IV/key */
 622                 unsigned int immdlen;
 623                 int len = skb->len;    /* length [ulp bytes] inserted by hw */
 624                 int flowclen16 = 0;
 625                 int tls_tx_imm = 0;
 626
 627                 immdlen = skb->len;
 628                 if (!is_ofld_imm(csk, skb)) {
 629                         immdlen = skb_transport_offset(skb);
 630                         if (skb_ulp_tls_inline(skb))
 631                                 wr_size = chtls_wr_size(csk, skb, false);
 632                         credit_len = 8 * calc_tx_flits(skb, immdlen);
 633                 } else {
 634                         if (skb_ulp_tls_inline(skb)) {
 635                                 wr_size = chtls_wr_size(csk, skb, false);
 636                                 tls_tx_imm = 1;
 637                         }
 638                 }
 639                 if (likely(ULP_SKB_CB(skb)->flags & ULPCB_FLAG_NEED_HDR))
 640                         credit_len += wr_size;
 641                 credits_needed = DIV_ROUND_UP(credit_len, 16);
 642                 if (!csk_flag_nochk(csk, CSK_TX_DATA_SENT)) {
 643                         flowclen16 = send_tx_flowc_wr(sk, 1, tp->snd_nxt,
 644                                                       tp->rcv_nxt);
 645                         if (flowclen16 <= 0)
 646                                 break;
 647                         csk->wr_credits -= flowclen16;
 648                         csk->wr_unacked += flowclen16;
 649                         csk->wr_nondata += flowclen16;
 650                         csk_set_flag(csk, CSK_TX_DATA_SENT);
 651                 }
 652
 653                 if (csk->wr_credits < credits_needed) {
 654                         if (skb_ulp_tls_inline(skb) &&
 655                             !skb_ulp_tls_iv_imm(skb))
 656                                 skb_shinfo(skb)->nr_frags--;
 657                         break;
 658                 }
 659
 660                 __skb_unlink(skb, &csk->txq);
 661                 skb_set_queue_mapping(skb, (csk->txq_idx << 1) |
 662                                       CPL_PRIORITY_DATA);
 663                 if (hws->ofld)
 664                         hws->txqid = (skb->queue_mapping >> 1);
 665                 skb->csum = (__force __wsum)(credits_needed + csk->wr_nondata);
 666                 csk->wr_credits -= credits_needed;
 667                 csk->wr_unacked += credits_needed;
 668                 csk->wr_nondata = 0;
 669                 enqueue_wr(csk, skb);
 670
 671                 if (likely(ULP_SKB_CB(skb)->flags & ULPCB_FLAG_NEED_HDR)) {
 672                         if ((comp && csk->wr_unacked == credits_needed) ||
 673                             (ULP_SKB_CB(skb)->flags & ULPCB_FLAG_COMPL) ||
 674                             csk->wr_unacked >= csk->wr_max_credits / 2) {
 675                                 completion = 1;
 676                                 csk->wr_unacked = 0;
 677                         }
 678                         if (skb_ulp_tls_inline(skb))
 679                                 make_tlstx_data_wr(sk, skb, tls_tx_imm,
 680                                                    tls_len, credits_needed);
 681                         else
 682                                 make_tx_data_wr(sk, skb, immdlen, len,
 683                                                 credits_needed, completion);
 684                         tp->snd_nxt += len;
 685                         tp->lsndtime = tcp_jiffies32;
 686                         if (completion)
 687                                 ULP_SKB_CB(skb)->flags &= ~ULPCB_FLAG_NEED_HDR;
 688                 } else {
 689                         struct cpl_close_con_req *req = cplhdr(skb);
 690                         unsigned int cmd  = CPL_OPCODE_G(ntohl
 691                                              (OPCODE_TID(req)));
 692
 693                         if (cmd == CPL_CLOSE_CON_REQ)
 694                                 csk_set_flag(csk,
 695                                              CSK_CLOSE_CON_REQUESTED);
 696
 697                         if ((ULP_SKB_CB(skb)->flags & ULPCB_FLAG_COMPL) &&
 698                             (csk->wr_unacked >= csk->wr_max_credits / 2)) {
 699                                 req->wr.wr_hi |= htonl(FW_WR_COMPL_F);
 700                                 csk->wr_unacked = 0;
 701                         }
 702                 }
 703                 total_size += skb->truesize;
 704                 if (ULP_SKB_CB(skb)->flags & ULPCB_FLAG_BARRIER)
 705                         csk_set_flag(csk, CSK_TX_WAIT_IDLE);
 706                 t4_set_arp_err_handler(skb, NULL, arp_failure_discard);
 707                 cxgb4_l2t_send(csk->egress_dev, skb, csk->l2t_entry);
 708         }
 709         sk->sk_wmem_queued -= total_size;
 710         return total_size;
 711 }
 712
 713 static void mark_urg(struct tcp_sock *tp, int flags,
 714                      struct sk_buff *skb)
 715 {
 716         if (unlikely(flags & MSG_OOB)) {
 717                 tp->snd_up = tp->write_seq;
 718                 ULP_SKB_CB(skb)->flags = ULPCB_FLAG_URG |
 719                                          ULPCB_FLAG_BARRIER |
 720                                          ULPCB_FLAG_NO_APPEND |
 721                                          ULPCB_FLAG_NEED_HDR;
 722         }
 723 }
 724
 725 /*
 726  * Returns true if a connection should send more data to TCP engine
 727  */
 728 static bool should_push(struct sock *sk)
 729 {
 730         struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
 731         struct chtls_dev *cdev = csk->cdev;
 732         struct tcp_sock *tp = tcp_sk(sk);
 733
 734         /*
 735          * If we've released our offload resources there's nothing to do ...
 736          */
 737         if (!cdev)
 738                 return false;
 739
 740         /*
 741          * If there aren't any work requests in flight, or there isn't enough
 742          * data in flight, or Nagle is off then send the current TX_DATA
 743          * otherwise hold it and wait to accumulate more data.
 744          */
 745         return csk->wr_credits == csk->wr_max_credits ||
 746                 (tp->nonagle & TCP_NAGLE_OFF);
 747 }
 748
 749 /*
 750  * Returns true if a TCP socket is corked.
 751  */
 752 static bool corked(const struct tcp_sock *tp, int flags)
 753 {
 754         return (flags & MSG_MORE) || (tp->nonagle & TCP_NAGLE_CORK);
 755 }
 756
 757 /*
 758  * Returns true if a send should try to push new data.
 759  */
 760 static bool send_should_push(struct sock *sk, int flags)
 761 {
 762         return should_push(sk) && !corked(tcp_sk(sk), flags);
 763 }
 764
 765 void chtls_tcp_push(struct sock *sk, int flags)
 766 {
 767         struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
 768         int qlen = skb_queue_len(&csk->txq);
 769
 770         if (likely(qlen)) {
 771                 struct sk_buff *skb = skb_peek_tail(&csk->txq);
 772                 struct tcp_sock *tp = tcp_sk(sk);
 773
 774                 mark_urg(tp, flags, skb);
 775
 776                 if (!(ULP_SKB_CB(skb)->flags & ULPCB_FLAG_NO_APPEND) &&
 777                     corked(tp, flags)) {
 778                         ULP_SKB_CB(skb)->flags |= ULPCB_FLAG_HOLD;
 779                         return;
 780                 }
 781
 782                 ULP_SKB_CB(skb)->flags &= ~ULPCB_FLAG_HOLD;
 783                 if (qlen == 1 &&
 784                     ((ULP_SKB_CB(skb)->flags & ULPCB_FLAG_NO_APPEND) ||
 785                      should_push(sk)))
 786                         chtls_push_frames(csk, 1);
 787         }
 788 }
 789
 790 /*
 791  * Calculate the size for a new send sk_buff.  It's maximum size so we can
 792  * pack lots of data into it, unless we plan to send it immediately, in which
 793  * case we size it more tightly.
 794  *
 795  * Note: we don't bother compensating for MSS < PAGE_SIZE because it doesn't
 796  * arise in normal cases and when it does we are just wasting memory.
 797  */
 798 static int select_size(struct sock *sk, int io_len, int flags, int len)
 799 {
 800         const int pgbreak = SKB_MAX_HEAD(len);
 801
 802         /*
 803          * If the data wouldn't fit in the main body anyway, put only the
 804          * header in the main body so it can use immediate data and place all
 805          * the payload in page fragments.
 806          */
 807         if (io_len > pgbreak)
 808                 return 0;
 809
 810         /*
 811          * If we will be accumulating payload get a large main body.
 812          */
 813         if (!send_should_push(sk, flags))
 814                 return pgbreak;
 815
 816         return io_len;
 817 }
 818
 819 void skb_entail(struct sock *sk, struct sk_buff *skb, int flags)
 820 {
 821         struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
 822         struct tcp_sock *tp = tcp_sk(sk);
 823
 824         ULP_SKB_CB(skb)->seq = tp->write_seq;
 825         ULP_SKB_CB(skb)->flags = flags;
 826         __skb_queue_tail(&csk->txq, skb);
 827         sk->sk_wmem_queued += skb->truesize;
 828
 829         if (TCP_PAGE(sk) && TCP_OFF(sk)) {
 830                 put_page(TCP_PAGE(sk));
 831                 TCP_PAGE(sk) = NULL;
 832                 TCP_OFF(sk) = 0;
 833         }
 834 }
 835
 836 static struct sk_buff *get_tx_skb(struct sock *sk, int size)
 837 {
 838         struct sk_buff *skb;
 839
 840         skb = alloc_skb(size + TX_HEADER_LEN, sk->sk_allocation);
 841         if (likely(skb)) {
 842                 skb_reserve(skb, TX_HEADER_LEN);
 843                 skb_entail(sk, skb, ULPCB_FLAG_NEED_HDR);
 844                 skb_reset_transport_header(skb);
 845         }
 846         return skb;
 847 }
 848
 849 static struct sk_buff *get_record_skb(struct sock *sk, int size, bool zcopy)
 850 {
 851         struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
 852         struct sk_buff *skb;
 853
 854         skb = alloc_skb(((zcopy ? 0 : size) + TX_TLSHDR_LEN +
 855                         KEY_ON_MEM_SZ + max_ivs_size(sk, size)),
 856                         sk->sk_allocation);
 857         if (likely(skb)) {
 858                 skb_reserve(skb, (TX_TLSHDR_LEN +
 859                             KEY_ON_MEM_SZ + max_ivs_size(sk, size)));
 860                 skb_entail(sk, skb, ULPCB_FLAG_NEED_HDR);
 861                 skb_reset_transport_header(skb);
 862                 ULP_SKB_CB(skb)->ulp.tls.ofld = 1;
 863                 ULP_SKB_CB(skb)->ulp.tls.type = csk->tlshws.type;
 864         }
 865         return skb;
 866 }
 867
 868 static void tx_skb_finalize(struct sk_buff *skb)
 869 {
 870         struct ulp_skb_cb *cb = ULP_SKB_CB(skb);
 871
 872         if (!(cb->flags & ULPCB_FLAG_NO_HDR))
 873                 cb->flags = ULPCB_FLAG_NEED_HDR;
 874         cb->flags |= ULPCB_FLAG_NO_APPEND;
 875 }
 876
 877 static void push_frames_if_head(struct sock *sk)
 878 {
 879         struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
 880
 881         if (skb_queue_len(&csk->txq) == 1)
 882                 chtls_push_frames(csk, 1);
 883 }
 884
 885 static int chtls_skb_copy_to_page_nocache(struct sock *sk,
 886                                           struct iov_iter *from,
 887                                           struct sk_buff *skb,
 888                                           struct page *page,
 889                                           int off, int copy)
 890 {
 891         int err;
 892
 893         err = skb_do_copy_data_nocache(sk, skb, from, page_address(page) +
 894                                        off, copy, skb->len);
 895         if (err)
 896                 return err;
 897
 898         skb->len             += copy;
 899         skb->data_len        += copy;
 900         skb->truesize        += copy;
 901         sk->sk_wmem_queued   += copy;
 902         return 0;
 903 }
 904
 905 static bool csk_mem_free(struct chtls_dev *cdev, struct sock *sk)
 906 {
 907         return (cdev->max_host_sndbuf - sk->sk_wmem_queued > 0);
 908 }
 909
 910 static int csk_wait_memory(struct chtls_dev *cdev,
 911                            struct sock *sk, long *timeo_p)
 912 {
 913         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 914         int ret, err = 0;
 915         long current_timeo;
 916         long vm_wait = 0;
 917         bool noblock;
 918
 919         current_timeo = *timeo_p;
 920         noblock = (*timeo_p ? false : true);
 921         if (csk_mem_free(cdev, sk)) {
 922                 current_timeo = get_random_u32_below(HZ / 5) + 2;
 923                 vm_wait = get_random_u32_below(HZ / 5) + 2;
 924         }
 925
 926         add_wait_queue(sk_sleep(sk), &wait);
 927         while (1) {
 928                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
 929
 930                 if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
 931                         goto do_error;
 932                 if (!*timeo_p) {
 933                         if (noblock)
 934                                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
 935                         goto do_nonblock;
 936                 }
 937                 if (signal_pending(current))
 938                         goto do_interrupted;
 939                 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
 940                 if (csk_mem_free(cdev, sk) && !vm_wait)
 941                         break;
 942
 943                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
 944                 sk->sk_write_pending++;
 945                 ret = sk_wait_event(sk, &current_timeo, sk->sk_err ||
 946                                     (sk->sk_shutdown & SEND_SHUTDOWN) ||
 947                                     (csk_mem_free(cdev, sk) && !vm_wait),
 948                                     &wait);
 949                 sk->sk_write_pending--;
 950                 if (ret < 0)
 951                         goto do_error;
 952
 953                 if (vm_wait) {
 954                         vm_wait -= current_timeo;
 955                         current_timeo = *timeo_p;
 956                         if (current_timeo != MAX_SCHEDULE_TIMEOUT) {
 957                                 current_timeo -= vm_wait;
 958                                 if (current_timeo < 0)
 959                                         current_timeo = 0;
 960                         }
 961                         vm_wait = 0;
 962                 }
 963                 *timeo_p = current_timeo;
 964         }
 965 do_rm_wq:
 966         remove_wait_queue(sk_sleep(sk), &wait);
 967         return err;
 968 do_error:
 969         err = -EPIPE;
 970         goto do_rm_wq;
 971 do_nonblock:
 972         err = -EAGAIN;
 973         goto do_rm_wq;
 974 do_interrupted:
 975         err = sock_intr_errno(*timeo_p);
 976         goto do_rm_wq;
 977 }
 978
 979 static int chtls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
 980                                unsigned char *record_type)
 981 {
 982         struct cmsghdr *cmsg;
 983         int rc = -EINVAL;
 984
 985         for_each_cmsghdr(cmsg, msg) {
 986                 if (!CMSG_OK(msg, cmsg))
 987                         return -EINVAL;
 988                 if (cmsg->cmsg_level != SOL_TLS)
 989                         continue;
 990
 991                 switch (cmsg->cmsg_type) {
 992                 case TLS_SET_RECORD_TYPE:
 993                         if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
 994                                 return -EINVAL;
 995
 996                         if (msg->msg_flags & MSG_MORE)
 997                                 return -EINVAL;
 998
 999                         *record_type = *(unsigned char *)CMSG_DATA(cmsg);
1000                         rc = 0;
1001                         break;
1002                 default:
1003                         return -EINVAL;
1004                 }
1005         }
1006
1007         return rc;
1008 }
1009
1010 int chtls_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
1011 {
1012         struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
1013         struct chtls_dev *cdev = csk->cdev;
1014         struct tcp_sock *tp = tcp_sk(sk);
1015         struct sk_buff *skb;
1016         int mss, flags, err;
1017         int recordsz = 0;
1018         int copied = 0;
1019         long timeo;
1020
1021         lock_sock(sk);
1022         flags = msg->msg_flags;
1023         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1024
1025         if (!sk_in_state(sk, TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) {
1026                 err = sk_stream_wait_connect(sk, &timeo);
1027                 if (err)
1028                         goto out_err;
1029         }
1030
1031         sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1032         err = -EPIPE;
1033         if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
1034                 goto out_err;
1035
1036         mss = csk->mss;
1037         csk_set_flag(csk, CSK_TX_MORE_DATA);
1038
1039         while (msg_data_left(msg)) {
1040                 int copy = 0;
1041
1042                 skb = skb_peek_tail(&csk->txq);
1043                 if (skb) {
1044                         copy = mss - skb->len;
1045                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1046                 }
1047                 if (!csk_mem_free(cdev, sk))
1048                         goto wait_for_sndbuf;
1049
1050                 if (is_tls_tx(csk) && !csk->tlshws.txleft) {
1051                         unsigned char record_type = TLS_RECORD_TYPE_DATA;
1052
1053                         if (unlikely(msg->msg_controllen)) {
1054                                 err = chtls_proccess_cmsg(sk, msg,
1055                                                           &record_type);
1056                                 if (err)
1057                                         goto out_err;
1058
1059                                 /* Avoid appending tls handshake, alert to tls data */
1060                                 if (skb)
1061                                         tx_skb_finalize(skb);
1062                         }
1063
1064                         recordsz = size;
1065                         csk->tlshws.txleft = recordsz;
1066                         csk->tlshws.type = record_type;
1067                 }
1068
1069                 if (!skb || (ULP_SKB_CB(skb)->flags & ULPCB_FLAG_NO_APPEND) ||
1070                     copy <= 0) {
1071 new_buf:
1072                         if (skb) {
1073                                 tx_skb_finalize(skb);
1074                                 push_frames_if_head(sk);
1075                         }
1076
1077                         if (is_tls_tx(csk)) {
1078                                 skb = get_record_skb(sk,
1079                                                      select_size(sk,
1080                                                                  recordsz,
1081                                                                  flags,
1082                                                                  TX_TLSHDR_LEN),
1083                                                                  false);
1084                         } else {
1085                                 skb = get_tx_skb(sk,
1086                                                  select_size(sk, size, flags,
1087                                                              TX_HEADER_LEN));
1088                         }
1089                         if (unlikely(!skb))
1090                                 goto wait_for_memory;
1091
1092                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1093                         copy = mss;
1094                 }
1095                 if (copy > size)
1096                         copy = size;
1097
1098                 if (msg->msg_flags & MSG_SPLICE_PAGES) {
1099                         err = skb_splice_from_iter(skb, &msg->msg_iter, copy,
1100                                                    sk->sk_allocation);
1101                         if (err < 0) {
1102                                 if (err == -EMSGSIZE)
1103                                         goto new_buf;
1104                                 goto do_fault;
1105                         }
1106                         copy = err;
1107                         sk_wmem_queued_add(sk, copy);
1108                 } else if (skb_tailroom(skb) > 0) {
1109                         copy = min(copy, skb_tailroom(skb));
1110                         if (is_tls_tx(csk))
1111                                 copy = min_t(int, copy, csk->tlshws.txleft);
1112                         err = skb_add_data_nocache(sk, skb,
1113                                                    &msg->msg_iter, copy);
1114                         if (err)
1115                                 goto do_fault;
1116                 } else {
1117                         int i = skb_shinfo(skb)->nr_frags;
1118                         struct page *page = TCP_PAGE(sk);
1119                         int pg_size = PAGE_SIZE;
1120                         int off = TCP_OFF(sk);
1121                         bool merge;
1122
1123                         if (page)
1124                                 pg_size = page_size(page);
1125                         if (off < pg_size &&
1126                             skb_can_coalesce(skb, i, page, off)) {
1127                                 merge = true;
1128                                 goto copy;
1129                         }
1130                         merge = false;
1131                         if (i == (is_tls_tx(csk) ? (MAX_SKB_FRAGS - 1) :
1132                             MAX_SKB_FRAGS))
1133                                 goto new_buf;
1134
1135                         if (page && off == pg_size) {
1136                                 put_page(page);
1137                                 TCP_PAGE(sk) = page = NULL;
1138                                 pg_size = PAGE_SIZE;
1139                         }
1140
1141                         if (!page) {
1142                                 gfp_t gfp = sk->sk_allocation;
1143                                 int order = cdev->send_page_order;
1144
1145                                 if (order) {
1146                                         page = alloc_pages(gfp | __GFP_COMP |
1147                                                            __GFP_NOWARN |
1148                                                            __GFP_NORETRY,
1149                                                            order);
1150                                         if (page)
1151                                                 pg_size <<= order;
1152                                 }
1153                                 if (!page) {
1154                                         page = alloc_page(gfp);
1155                                         pg_size = PAGE_SIZE;
1156                                 }
1157                                 if (!page)
1158                                         goto wait_for_memory;
1159                                 off = 0;
1160                         }
1161 copy:
1162                         if (copy > pg_size - off)
1163                                 copy = pg_size - off;
1164                         if (is_tls_tx(csk))
1165                                 copy = min_t(int, copy, csk->tlshws.txleft);
1166
1167                         err = chtls_skb_copy_to_page_nocache(sk, &msg->msg_iter,
1168                                                              skb, page,
1169                                                              off, copy);
1170                         if (unlikely(err)) {
1171                                 if (!TCP_PAGE(sk)) {
1172                                         TCP_PAGE(sk) = page;
1173                                         TCP_OFF(sk) = 0;
1174                                 }
1175                                 goto do_fault;
1176                         }
1177                         /* Update the skb. */
1178                         if (merge) {
1179                                 skb_frag_size_add(
1180                                                 &skb_shinfo(skb)->frags[i - 1],
1181                                                 copy);
1182                         } else {
1183                                 skb_fill_page_desc(skb, i, page, off, copy);
1184                                 if (off + copy < pg_size) {
1185                                         /* space left keep page */
1186                                         get_page(page);
1187                                         TCP_PAGE(sk) = page;
1188                                 } else {
1189                                         TCP_PAGE(sk) = NULL;
1190                                 }
1191                         }
1192                         TCP_OFF(sk) = off + copy;
1193                 }
1194                 if (unlikely(skb->len == mss))
1195                         tx_skb_finalize(skb);
1196                 tp->write_seq += copy;
1197                 copied += copy;
1198                 size -= copy;
1199
1200                 if (is_tls_tx(csk))
1201                         csk->tlshws.txleft -= copy;
1202
1203                 if (corked(tp, flags) &&
1204                     (sk_stream_wspace(sk) < sk_stream_min_wspace(sk)))
1205                         ULP_SKB_CB(skb)->flags |= ULPCB_FLAG_NO_APPEND;
1206
1207                 if (size == 0)
1208                         goto out;
1209
1210                 if (ULP_SKB_CB(skb)->flags & ULPCB_FLAG_NO_APPEND)
1211                         push_frames_if_head(sk);
1212                 continue;
1213 wait_for_sndbuf:
1214                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1215 wait_for_memory:
1216                 err = csk_wait_memory(cdev, sk, &timeo);
1217                 if (err)
1218                         goto do_error;
1219         }
1220 out:
1221         csk_reset_flag(csk, CSK_TX_MORE_DATA);
1222         if (copied)
1223                 chtls_tcp_push(sk, flags);
1224 done:
1225         release_sock(sk);
1226         return copied;
1227 do_fault:
1228         if (!skb->len) {
1229                 __skb_unlink(skb, &csk->txq);
1230                 sk->sk_wmem_queued -= skb->truesize;
1231                 __kfree_skb(skb);
1232         }
1233 do_error:
1234         if (copied)
1235                 goto out;
1236 out_err:
1237         if (csk_conn_inline(csk))
1238                 csk_reset_flag(csk, CSK_TX_MORE_DATA);
1239         copied = sk_stream_error(sk, flags, err);
1240         goto done;
1241 }
1242
1243 void chtls_splice_eof(struct socket *sock)
1244 {
1245         struct sock *sk = sock->sk;
1246
1247         lock_sock(sk);
1248         chtls_tcp_push(sk, 0);
1249         release_sock(sk);
1250 }
1251
1252 static void chtls_select_window(struct sock *sk)
1253 {
1254         struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
1255         struct tcp_sock *tp = tcp_sk(sk);
1256         unsigned int wnd = tp->rcv_wnd;
1257
1258         wnd = max_t(unsigned int, wnd, tcp_full_space(sk));
1259         wnd = max_t(unsigned int, MIN_RCV_WND, wnd);
1260
1261         if (wnd > MAX_RCV_WND)
1262                 wnd = MAX_RCV_WND;
1263
1264 /*
1265  * Check if we need to grow the receive window in response to an increase in
1266  * the socket's receive buffer size.  Some applications increase the buffer
1267  * size dynamically and rely on the window to grow accordingly.
1268  */
1269
1270         if (wnd > tp->rcv_wnd) {
1271                 tp->rcv_wup -= wnd - tp->rcv_wnd;
1272                 tp->rcv_wnd = wnd;
1273                 /* Mark the receive window as updated */
1274                 csk_reset_flag(csk, CSK_UPDATE_RCV_WND);
1275         }
1276 }
1277
1278 /*
1279  * Send RX credits through an RX_DATA_ACK CPL message.  We are permitted
1280  * to return without sending the message in case we cannot allocate
1281  * an sk_buff.  Returns the number of credits sent.
1282  */
1283 static u32 send_rx_credits(struct chtls_sock *csk, u32 credits)
1284 {
1285         struct cpl_rx_data_ack *req;
1286         struct sk_buff *skb;
1287
1288         skb = alloc_skb(sizeof(*req), GFP_ATOMIC);
1289         if (!skb)
1290                 return 0;
1291         __skb_put(skb, sizeof(*req));
1292         req = (struct cpl_rx_data_ack *)skb->head;
1293
1294         set_wr_txq(skb, CPL_PRIORITY_ACK, csk->port_id);
1295         INIT_TP_WR(req, csk->tid);
1296         OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK,
1297                                                     csk->tid));
1298         req->credit_dack = cpu_to_be32(RX_CREDITS_V(credits) |
1299                                        RX_FORCE_ACK_F);
1300         cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
1301         return credits;
1302 }
1303
1304 #define CREDIT_RETURN_STATE (TCPF_ESTABLISHED | \
1305                              TCPF_FIN_WAIT1 | \
1306                              TCPF_FIN_WAIT2)
1307
1308 /*
1309  * Called after some received data has been read.  It returns RX credits
1310  * to the HW for the amount of data processed.
1311  */
1312 static void chtls_cleanup_rbuf(struct sock *sk, int copied)
1313 {
1314         struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
1315         struct tcp_sock *tp;
1316         int must_send;
1317         u32 credits;
1318         u32 thres;
1319
1320         thres = 15 * 1024;
1321
1322         if (!sk_in_state(sk, CREDIT_RETURN_STATE))
1323                 return;
1324
1325         chtls_select_window(sk);
1326         tp = tcp_sk(sk);
1327         credits = tp->copied_seq - tp->rcv_wup;
1328         if (unlikely(!credits))
1329                 return;
1330
1331 /*
1332  * For coalescing to work effectively ensure the receive window has
1333  * at least 16KB left.
1334  */
1335         must_send = credits + 16384 >= tp->rcv_wnd;
1336
1337         if (must_send || credits >= thres)
1338                 tp->rcv_wup += send_rx_credits(csk, credits);
1339 }
1340
1341 static int chtls_pt_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
1342                             int flags, int *addr_len)
1343 {
1344         struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
1345         struct chtls_hws *hws = &csk->tlshws;
1346         struct net_device *dev = csk->egress_dev;
1347         struct adapter *adap = netdev2adap(dev);
1348         struct tcp_sock *tp = tcp_sk(sk);
1349         unsigned long avail;
1350         int buffers_freed;
1351         int copied = 0;
1352         int target;
1353         long timeo;
1354         int ret;
1355
1356         buffers_freed = 0;
1357
1358         timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1359         target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
1360
1361         if (unlikely(csk_flag(sk, CSK_UPDATE_RCV_WND)))
1362                 chtls_cleanup_rbuf(sk, copied);
1363
1364         do {
1365                 struct sk_buff *skb;
1366                 u32 offset = 0;
1367
1368                 if (unlikely(tp->urg_data &&
1369                              tp->urg_seq == tp->copied_seq)) {
1370                         if (copied)
1371                                 break;
1372                         if (signal_pending(current)) {
1373                                 copied = timeo ? sock_intr_errno(timeo) :
1374                                         -EAGAIN;
1375                                 break;
1376                         }
1377                 }
1378                 skb = skb_peek(&sk->sk_receive_queue);
1379                 if (skb)
1380                         goto found_ok_skb;
1381                 if (csk->wr_credits &&
1382                     skb_queue_len(&csk->txq) &&
1383                     chtls_push_frames(csk, csk->wr_credits ==
1384                                       csk->wr_max_credits))
1385                         sk->sk_write_space(sk);
1386
1387                 if (copied >= target && !READ_ONCE(sk->sk_backlog.tail))
1388                         break;
1389
1390                 if (copied) {
1391                         if (sk->sk_err || sk->sk_state == TCP_CLOSE ||
1392                             (sk->sk_shutdown & RCV_SHUTDOWN) ||
1393                             signal_pending(current))
1394                                 break;
1395
1396                         if (!timeo)
1397                                 break;
1398                 } else {
1399                         if (sock_flag(sk, SOCK_DONE))
1400                                 break;
1401                         if (sk->sk_err) {
1402                                 copied = sock_error(sk);
1403                                 break;
1404                         }
1405                         if (sk->sk_shutdown & RCV_SHUTDOWN)
1406                                 break;
1407                         if (sk->sk_state == TCP_CLOSE) {
1408                                 copied = -ENOTCONN;
1409                                 break;
1410                         }
1411                         if (!timeo) {
1412                                 copied = -EAGAIN;
1413                                 break;
1414                         }
1415                         if (signal_pending(current)) {
1416                                 copied = sock_intr_errno(timeo);
1417                                 break;
1418                         }
1419                 }
1420                 if (READ_ONCE(sk->sk_backlog.tail)) {
1421                         release_sock(sk);
1422                         lock_sock(sk);
1423                         chtls_cleanup_rbuf(sk, copied);
1424                         continue;
1425                 }
1426
1427                 if (copied >= target)
1428                         break;
1429                 chtls_cleanup_rbuf(sk, copied);
1430                 ret = sk_wait_data(sk, &timeo, NULL);
1431                 if (ret < 0) {
1432                         copied = copied ? : ret;
1433                         goto unlock;
1434                 }
1435                 continue;
1436 found_ok_skb:
1437                 if (!skb->len) {
1438                         skb_dst_set(skb, NULL);
1439                         __skb_unlink(skb, &sk->sk_receive_queue);
1440                         kfree_skb(skb);
1441
1442                         if (!copied && !timeo) {
1443                                 copied = -EAGAIN;
1444                                 break;
1445                         }
1446
1447                         if (copied < target) {
1448                                 release_sock(sk);
1449                                 lock_sock(sk);
1450                                 continue;
1451                         }
1452                         break;
1453                 }
1454                 offset = hws->copied_seq;
1455                 avail = skb->len - offset;
1456                 if (len < avail)
1457                         avail = len;
1458
1459                 if (unlikely(tp->urg_data)) {
1460                         u32 urg_offset = tp->urg_seq - tp->copied_seq;
1461
1462                         if (urg_offset < avail) {
1463                                 if (urg_offset) {
1464                                         avail = urg_offset;
1465                                 } else if (!sock_flag(sk, SOCK_URGINLINE)) {
1466                                         /* First byte is urgent, skip */
1467                                         tp->copied_seq++;
1468                                         offset++;
1469                                         avail--;
1470                                         if (!avail)
1471                                                 goto skip_copy;
1472                                 }
1473                         }
1474                 }
1475                 /* Set record type if not already done. For a non-data record,
1476                  * do not proceed if record type could not be copied.
1477                  */
1478                 if (ULP_SKB_CB(skb)->flags & ULPCB_FLAG_TLS_HDR) {
1479                         struct tls_hdr *thdr = (struct tls_hdr *)skb->data;
1480                         int cerr = 0;
1481
1482                         cerr = put_cmsg(msg, SOL_TLS, TLS_GET_RECORD_TYPE,
1483                                         sizeof(thdr->type), &thdr->type);
1484
1485                         if (cerr && thdr->type != TLS_RECORD_TYPE_DATA) {
1486                                 copied = -EIO;
1487                                 break;
1488                         }
1489                         /*  don't send tls header, skip copy */
1490                         goto skip_copy;
1491                 }
1492
1493                 if (skb_copy_datagram_msg(skb, offset, msg, avail)) {
1494                         if (!copied) {
1495                                 copied = -EFAULT;
1496                                 break;
1497                         }
1498                 }
1499
1500                 copied += avail;
1501                 len -= avail;
1502                 hws->copied_seq += avail;
1503 skip_copy:
1504                 if (tp->urg_data && after(tp->copied_seq, tp->urg_seq))
1505                         tp->urg_data = 0;
1506
1507                 if ((avail + offset) >= skb->len) {
1508                         struct sk_buff *next_skb;
1509                         if (ULP_SKB_CB(skb)->flags & ULPCB_FLAG_TLS_HDR) {
1510                                 tp->copied_seq += skb->len;
1511                                 hws->rcvpld = skb->hdr_len;
1512                         } else {
1513                                 atomic_inc(&adap->chcr_stats.tls_pdu_rx);
1514                                 tp->copied_seq += hws->rcvpld;
1515                         }
1516                         chtls_free_skb(sk, skb);
1517                         buffers_freed++;
1518                         hws->copied_seq = 0;
1519                         next_skb = skb_peek(&sk->sk_receive_queue);
1520                         if (copied >= target && !next_skb)
1521                                 break;
1522                         if (ULP_SKB_CB(next_skb)->flags & ULPCB_FLAG_TLS_HDR)
1523                                 break;
1524                 }
1525         } while (len > 0);
1526
1527         if (buffers_freed)
1528                 chtls_cleanup_rbuf(sk, copied);
1529
1530 unlock:
1531         release_sock(sk);
1532         return copied;
1533 }
1534
1535 /*
1536  * Peek at data in a socket's receive buffer.
1537  */
1538 static int peekmsg(struct sock *sk, struct msghdr *msg,
1539                    size_t len, int flags)
1540 {
1541         struct tcp_sock *tp = tcp_sk(sk);
1542         u32 peek_seq, offset;
1543         struct sk_buff *skb;
1544         int copied = 0;
1545         size_t avail;          /* amount of available data in current skb */
1546         long timeo;
1547         int ret;
1548
1549         lock_sock(sk);
1550         timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1551         peek_seq = tp->copied_seq;
1552
1553         do {
1554                 if (unlikely(tp->urg_data && tp->urg_seq == peek_seq)) {
1555                         if (copied)
1556                                 break;
1557                         if (signal_pending(current)) {
1558                                 copied = timeo ? sock_intr_errno(timeo) :
1559                                 -EAGAIN;
1560                                 break;
1561                         }
1562                 }
1563
1564                 skb_queue_walk(&sk->sk_receive_queue, skb) {
1565                         offset = peek_seq - ULP_SKB_CB(skb)->seq;
1566                         if (offset < skb->len)
1567                                 goto found_ok_skb;
1568                 }
1569
1570                 /* empty receive queue */
1571                 if (copied)
1572                         break;
1573                 if (sock_flag(sk, SOCK_DONE))
1574                         break;
1575                 if (sk->sk_err) {
1576                         copied = sock_error(sk);
1577                         break;
1578                 }
1579                 if (sk->sk_shutdown & RCV_SHUTDOWN)
1580                         break;
1581                 if (sk->sk_state == TCP_CLOSE) {
1582                         copied = -ENOTCONN;
1583                         break;
1584                 }
1585                 if (!timeo) {
1586                         copied = -EAGAIN;
1587                         break;
1588                 }
1589                 if (signal_pending(current)) {
1590                         copied = sock_intr_errno(timeo);
1591                         break;
1592                 }
1593
1594                 if (READ_ONCE(sk->sk_backlog.tail)) {
1595                         /* Do not sleep, just process backlog. */
1596                         release_sock(sk);
1597                         lock_sock(sk);
1598                 } else {
1599                         ret = sk_wait_data(sk, &timeo, NULL);
1600                         if (ret < 0) {
1601                                 /* here 'copied' is 0 due to previous checks */
1602                                 copied = ret;
1603                                 break;
1604                         }
1605                 }
1606
1607                 if (unlikely(peek_seq != tp->copied_seq)) {
1608                         if (net_ratelimit())
1609                                 pr_info("TCP(%s:%d), race in MSG_PEEK.\n",
1610                                         current->comm, current->pid);
1611                         peek_seq = tp->copied_seq;
1612                 }
1613                 continue;
1614
1615 found_ok_skb:
1616                 avail = skb->len - offset;
1617                 if (len < avail)
1618                         avail = len;
1619                 /*
1620                  * Do we have urgent data here?  We need to skip over the
1621                  * urgent byte.
1622                  */
1623                 if (unlikely(tp->urg_data)) {
1624                         u32 urg_offset = tp->urg_seq - peek_seq;
1625
1626                         if (urg_offset < avail) {
1627                                 /*
1628                                  * The amount of data we are preparing to copy
1629                                  * contains urgent data.
1630                                  */
1631                                 if (!urg_offset) { /* First byte is urgent */
1632                                         if (!sock_flag(sk, SOCK_URGINLINE)) {
1633                                                 peek_seq++;
1634                                                 offset++;
1635                                                 avail--;
1636                                         }
1637                                         if (!avail)
1638                                                 continue;
1639                                 } else {
1640                                         /* stop short of the urgent data */
1641                                         avail = urg_offset;
1642                                 }
1643                         }
1644                 }
1645
1646                 /*
1647                  * If MSG_TRUNC is specified the data is discarded.
1648                  */
1649                 if (likely(!(flags & MSG_TRUNC)))
1650                         if (skb_copy_datagram_msg(skb, offset, msg, len)) {
1651                                 if (!copied) {
1652                                         copied = -EFAULT;
1653                                         break;
1654                                 }
1655                         }
1656                 peek_seq += avail;
1657                 copied += avail;
1658                 len -= avail;
1659         } while (len > 0);
1660
1661         release_sock(sk);
1662         return copied;
1663 }
1664
1665 int chtls_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
1666                   int flags, int *addr_len)
1667 {
1668         struct tcp_sock *tp = tcp_sk(sk);
1669         struct chtls_sock *csk;
1670         unsigned long avail;    /* amount of available data in current skb */
1671         int buffers_freed;
1672         int copied = 0;
1673         long timeo;
1674         int target;             /* Read at least this many bytes */
1675         int ret;
1676
1677         buffers_freed = 0;
1678
1679         if (unlikely(flags & MSG_OOB))
1680                 return tcp_prot.recvmsg(sk, msg, len, flags, addr_len);
1681
1682         if (unlikely(flags & MSG_PEEK))
1683                 return peekmsg(sk, msg, len, flags);
1684
1685         if (sk_can_busy_loop(sk) &&
1686             skb_queue_empty_lockless(&sk->sk_receive_queue) &&
1687             sk->sk_state == TCP_ESTABLISHED)
1688                 sk_busy_loop(sk, flags & MSG_DONTWAIT);
1689
1690         lock_sock(sk);
1691         csk = rcu_dereference_sk_user_data(sk);
1692
1693         if (is_tls_rx(csk))
1694                 return chtls_pt_recvmsg(sk, msg, len, flags, addr_len);
1695
1696         timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1697         target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
1698
1699         if (unlikely(csk_flag(sk, CSK_UPDATE_RCV_WND)))
1700                 chtls_cleanup_rbuf(sk, copied);
1701
1702         do {
1703                 struct sk_buff *skb;
1704                 u32 offset;
1705
1706                 if (unlikely(tp->urg_data && tp->urg_seq == tp->copied_seq)) {
1707                         if (copied)
1708                                 break;
1709                         if (signal_pending(current)) {
1710                                 copied = timeo ? sock_intr_errno(timeo) :
1711                                         -EAGAIN;
1712                                 break;
1713                         }
1714                 }
1715
1716                 skb = skb_peek(&sk->sk_receive_queue);
1717                 if (skb)
1718                         goto found_ok_skb;
1719
1720                 if (csk->wr_credits &&
1721                     skb_queue_len(&csk->txq) &&
1722                     chtls_push_frames(csk, csk->wr_credits ==
1723                                       csk->wr_max_credits))
1724                         sk->sk_write_space(sk);
1725
1726                 if (copied >= target && !READ_ONCE(sk->sk_backlog.tail))
1727                         break;
1728
1729                 if (copied) {
1730                         if (sk->sk_err || sk->sk_state == TCP_CLOSE ||
1731                             (sk->sk_shutdown & RCV_SHUTDOWN) ||
1732                             signal_pending(current))
1733                                 break;
1734                 } else {
1735                         if (sock_flag(sk, SOCK_DONE))
1736                                 break;
1737                         if (sk->sk_err) {
1738                                 copied = sock_error(sk);
1739                                 break;
1740                         }
1741                         if (sk->sk_shutdown & RCV_SHUTDOWN)
1742                                 break;
1743                         if (sk->sk_state == TCP_CLOSE) {
1744                                 copied = -ENOTCONN;
1745                                 break;
1746                         }
1747                         if (!timeo) {
1748                                 copied = -EAGAIN;
1749                                 break;
1750                         }
1751                         if (signal_pending(current)) {
1752                                 copied = sock_intr_errno(timeo);
1753                                 break;
1754                         }
1755                 }
1756
1757                 if (READ_ONCE(sk->sk_backlog.tail)) {
1758                         release_sock(sk);
1759                         lock_sock(sk);
1760                         chtls_cleanup_rbuf(sk, copied);
1761                         continue;
1762                 }
1763
1764                 if (copied >= target)
1765                         break;
1766                 chtls_cleanup_rbuf(sk, copied);
1767                 ret = sk_wait_data(sk, &timeo, NULL);
1768                 if (ret < 0) {
1769                         copied = copied ? : ret;
1770                         goto unlock;
1771                 }
1772                 continue;
1773
1774 found_ok_skb:
1775                 if (!skb->len) {
1776                         chtls_kfree_skb(sk, skb);
1777                         if (!copied && !timeo) {
1778                                 copied = -EAGAIN;
1779                                 break;
1780                         }
1781
1782                         if (copied < target)
1783                                 continue;
1784
1785                         break;
1786                 }
1787
1788                 offset = tp->copied_seq - ULP_SKB_CB(skb)->seq;
1789                 avail = skb->len - offset;
1790                 if (len < avail)
1791                         avail = len;
1792
1793                 if (unlikely(tp->urg_data)) {
1794                         u32 urg_offset = tp->urg_seq - tp->copied_seq;
1795
1796                         if (urg_offset < avail) {
1797                                 if (urg_offset) {
1798                                         avail = urg_offset;
1799                                 } else if (!sock_flag(sk, SOCK_URGINLINE)) {
1800                                         tp->copied_seq++;
1801                                         offset++;
1802                                         avail--;
1803                                         if (!avail)
1804                                                 goto skip_copy;
1805                                 }
1806                         }
1807                 }
1808
1809                 if (likely(!(flags & MSG_TRUNC))) {
1810                         if (skb_copy_datagram_msg(skb, offset,
1811                                                   msg, avail)) {
1812                                 if (!copied) {
1813                                         copied = -EFAULT;
1814                                         break;
1815                                 }
1816                         }
1817                 }
1818
1819                 tp->copied_seq += avail;
1820                 copied += avail;
1821                 len -= avail;
1822
1823 skip_copy:
1824                 if (tp->urg_data && after(tp->copied_seq, tp->urg_seq))
1825                         tp->urg_data = 0;
1826
1827                 if (avail + offset >= skb->len) {
1828                         chtls_free_skb(sk, skb);
1829                         buffers_freed++;
1830
1831                         if  (copied >= target &&
1832                              !skb_peek(&sk->sk_receive_queue))
1833                                 break;
1834                 }
1835         } while (len > 0);
1836
1837         if (buffers_freed)
1838                 chtls_cleanup_rbuf(sk, copied);
1839
1840 unlock:
1841         release_sock(sk);
1842         return copied;
1843 }