drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c

   1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
   2 // Copyright (c) 2019 Mellanox Technologies.
   3
   4 #include <linux/tls.h>
   5 #include "en.h"
   6 #include "en/txrx.h"
   7 #include "en_accel/ktls.h"
   8
   9 enum {
  10         MLX5E_STATIC_PARAMS_CONTEXT_TLS_1_2 = 0x2,
  11 };
  12
  13 enum {
  14         MLX5E_ENCRYPTION_STANDARD_TLS = 0x1,
  15 };
  16
  17 #define EXTRACT_INFO_FIELDS do { \
  18         salt    = info->salt;    \
  19         rec_seq = info->rec_seq; \
  20         salt_sz    = sizeof(info->salt);    \
  21         rec_seq_sz = sizeof(info->rec_seq); \
  22 } while (0)
  23
  24 static void
  25 fill_static_params_ctx(void *ctx, struct mlx5e_ktls_offload_context_tx *priv_tx)
  26 {
  27         struct tls_crypto_info *crypto_info = priv_tx->crypto_info;
  28         struct tls12_crypto_info_aes_gcm_128 *info;
  29         char *initial_rn, *gcm_iv;
  30         u16 salt_sz, rec_seq_sz;
  31         char *salt, *rec_seq;
  32         u8 tls_version;
  33
  34         if (WARN_ON(crypto_info->cipher_type != TLS_CIPHER_AES_GCM_128))
  35                 return;
  36
  37         info = (struct tls12_crypto_info_aes_gcm_128 *)crypto_info;
  38         EXTRACT_INFO_FIELDS;
  39
  40         gcm_iv      = MLX5_ADDR_OF(tls_static_params, ctx, gcm_iv);
  41         initial_rn  = MLX5_ADDR_OF(tls_static_params, ctx, initial_record_number);
  42
  43         memcpy(gcm_iv,      salt,    salt_sz);
  44         memcpy(initial_rn,  rec_seq, rec_seq_sz);
  45
  46         tls_version = MLX5E_STATIC_PARAMS_CONTEXT_TLS_1_2;
  47
  48         MLX5_SET(tls_static_params, ctx, tls_version, tls_version);
  49         MLX5_SET(tls_static_params, ctx, const_1, 1);
  50         MLX5_SET(tls_static_params, ctx, const_2, 2);
  51         MLX5_SET(tls_static_params, ctx, encryption_standard,
  52                  MLX5E_ENCRYPTION_STANDARD_TLS);
  53         MLX5_SET(tls_static_params, ctx, dek_index, priv_tx->key_id);
  54 }
  55
  56 static void
  57 build_static_params(struct mlx5e_umr_wqe *wqe, u16 pc, u32 sqn,
  58                     struct mlx5e_ktls_offload_context_tx *priv_tx,
  59                     bool fence)
  60 {
  61         struct mlx5_wqe_ctrl_seg     *cseg  = &wqe->ctrl;
  62         struct mlx5_wqe_umr_ctrl_seg *ucseg = &wqe->uctrl;
  63
  64 #define STATIC_PARAMS_DS_CNT \
  65         DIV_ROUND_UP(MLX5E_KTLS_STATIC_UMR_WQE_SZ, MLX5_SEND_WQE_DS)
  66
  67         cseg->opmod_idx_opcode = cpu_to_be32((pc << 8) | MLX5_OPCODE_UMR |
  68                                              (MLX5_OPC_MOD_TLS_TIS_STATIC_PARAMS << 24));
  69         cseg->qpn_ds           = cpu_to_be32((sqn << MLX5_WQE_CTRL_QPN_SHIFT) |
  70                                              STATIC_PARAMS_DS_CNT);
  71         cseg->fm_ce_se         = fence ? MLX5_FENCE_MODE_INITIATOR_SMALL : 0;
  72         cseg->tisn             = cpu_to_be32(priv_tx->tisn << 8);
  73
  74         ucseg->flags = MLX5_UMR_INLINE;
  75         ucseg->bsf_octowords = cpu_to_be16(MLX5_ST_SZ_BYTES(tls_static_params) / 16);
  76
  77         fill_static_params_ctx(wqe->tls_static_params_ctx, priv_tx);
  78 }
  79
  80 static void
  81 fill_progress_params_ctx(void *ctx, struct mlx5e_ktls_offload_context_tx *priv_tx)
  82 {
  83         MLX5_SET(tls_progress_params, ctx, tisn, priv_tx->tisn);
  84         MLX5_SET(tls_progress_params, ctx, record_tracker_state,
  85                  MLX5E_TLS_PROGRESS_PARAMS_RECORD_TRACKER_STATE_START);
  86         MLX5_SET(tls_progress_params, ctx, auth_state,
  87                  MLX5E_TLS_PROGRESS_PARAMS_AUTH_STATE_NO_OFFLOAD);
  88 }
  89
  90 static void
  91 build_progress_params(struct mlx5e_tx_wqe *wqe, u16 pc, u32 sqn,
  92                       struct mlx5e_ktls_offload_context_tx *priv_tx,
  93                       bool fence)
  94 {
  95         struct mlx5_wqe_ctrl_seg *cseg = &wqe->ctrl;
  96
  97 #define PROGRESS_PARAMS_DS_CNT \
  98         DIV_ROUND_UP(MLX5E_KTLS_PROGRESS_WQE_SZ, MLX5_SEND_WQE_DS)
  99
 100         cseg->opmod_idx_opcode =
 101                 cpu_to_be32((pc << 8) | MLX5_OPCODE_SET_PSV |
 102                             (MLX5_OPC_MOD_TLS_TIS_PROGRESS_PARAMS << 24));
 103         cseg->qpn_ds           = cpu_to_be32((sqn << MLX5_WQE_CTRL_QPN_SHIFT) |
 104                                              PROGRESS_PARAMS_DS_CNT);
 105         cseg->fm_ce_se         = fence ? MLX5_FENCE_MODE_INITIATOR_SMALL : 0;
 106
 107         fill_progress_params_ctx(wqe->tls_progress_params_ctx, priv_tx);
 108 }
 109
 110 static void tx_fill_wi(struct mlx5e_txqsq *sq,
 111                        u16 pi, u8 num_wqebbs, u32 num_bytes,
 112                        struct page *page)
 113 {
 114         struct mlx5e_tx_wqe_info *wi = &sq->db.wqe_info[pi];
 115
 116         memset(wi, 0, sizeof(*wi));
 117         wi->num_wqebbs = num_wqebbs;
 118         wi->num_bytes  = num_bytes;
 119         wi->resync_dump_frag_page = page;
 120 }
 121
 122 void mlx5e_ktls_tx_offload_set_pending(struct mlx5e_ktls_offload_context_tx *priv_tx)
 123 {
 124         priv_tx->ctx_post_pending = true;
 125 }
 126
 127 static bool
 128 mlx5e_ktls_tx_offload_test_and_clear_pending(struct mlx5e_ktls_offload_context_tx *priv_tx)
 129 {
 130         bool ret = priv_tx->ctx_post_pending;
 131
 132         priv_tx->ctx_post_pending = false;
 133
 134         return ret;
 135 }
 136
 137 static void
 138 post_static_params(struct mlx5e_txqsq *sq,
 139                    struct mlx5e_ktls_offload_context_tx *priv_tx,
 140                    bool fence)
 141 {
 142         struct mlx5e_umr_wqe *umr_wqe;
 143         u16 pi;
 144
 145         umr_wqe = mlx5e_sq_fetch_wqe(sq, MLX5E_KTLS_STATIC_UMR_WQE_SZ, &pi);
 146         build_static_params(umr_wqe, sq->pc, sq->sqn, priv_tx, fence);
 147         tx_fill_wi(sq, pi, MLX5E_KTLS_STATIC_WQEBBS, 0, NULL);
 148         sq->pc += MLX5E_KTLS_STATIC_WQEBBS;
 149 }
 150
 151 static void
 152 post_progress_params(struct mlx5e_txqsq *sq,
 153                      struct mlx5e_ktls_offload_context_tx *priv_tx,
 154                      bool fence)
 155 {
 156         struct mlx5e_tx_wqe *wqe;
 157         u16 pi;
 158
 159         wqe = mlx5e_sq_fetch_wqe(sq, MLX5E_KTLS_PROGRESS_WQE_SZ, &pi);
 160         build_progress_params(wqe, sq->pc, sq->sqn, priv_tx, fence);
 161         tx_fill_wi(sq, pi, MLX5E_KTLS_PROGRESS_WQEBBS, 0, NULL);
 162         sq->pc += MLX5E_KTLS_PROGRESS_WQEBBS;
 163 }
 164
 165 static void
 166 mlx5e_ktls_tx_post_param_wqes(struct mlx5e_txqsq *sq,
 167                               struct mlx5e_ktls_offload_context_tx *priv_tx,
 168                               bool skip_static_post, bool fence_first_post)
 169 {
 170         bool progress_fence = skip_static_post || !fence_first_post;
 171
 172         if (!skip_static_post)
 173                 post_static_params(sq, priv_tx, fence_first_post);
 174
 175         post_progress_params(sq, priv_tx, progress_fence);
 176 }
 177
 178 struct tx_sync_info {
 179         u64 rcd_sn;
 180         s32 sync_len;
 181         int nr_frags;
 182         skb_frag_t frags[MAX_SKB_FRAGS];
 183 };
 184
 185 static bool tx_sync_info_get(struct mlx5e_ktls_offload_context_tx *priv_tx,
 186                              u32 tcp_seq, struct tx_sync_info *info)
 187 {
 188         struct tls_offload_context_tx *tx_ctx = priv_tx->tx_ctx;
 189         struct tls_record_info *record;
 190         int remaining, i = 0;
 191         unsigned long flags;
 192         bool ret = true;
 193
 194         spin_lock_irqsave(&tx_ctx->lock, flags);
 195         record = tls_get_record(tx_ctx, tcp_seq, &info->rcd_sn);
 196
 197         if (unlikely(!record)) {
 198                 ret = false;
 199                 goto out;
 200         }
 201
 202         if (unlikely(tcp_seq < tls_record_start_seq(record))) {
 203                 if (!tls_record_is_start_marker(record))
 204                         ret = false;
 205                 goto out;
 206         }
 207
 208         info->sync_len = tcp_seq - tls_record_start_seq(record);
 209         remaining = info->sync_len;
 210         while (remaining > 0) {
 211                 skb_frag_t *frag = &record->frags[i];
 212
 213                 get_page(skb_frag_page(frag));
 214                 remaining -= skb_frag_size(frag);
 215                 info->frags[i++] = *frag;
 216         }
 217         /* reduce the part which will be sent with the original SKB */
 218         if (remaining < 0)
 219                 skb_frag_size_add(&info->frags[i - 1], remaining);
 220         info->nr_frags = i;
 221 out:
 222         spin_unlock_irqrestore(&tx_ctx->lock, flags);
 223         return ret;
 224 }
 225
 226 static void
 227 tx_post_resync_params(struct mlx5e_txqsq *sq,
 228                       struct mlx5e_ktls_offload_context_tx *priv_tx,
 229                       u64 rcd_sn)
 230 {
 231         struct tls_crypto_info *crypto_info = priv_tx->crypto_info;
 232         struct tls12_crypto_info_aes_gcm_128 *info;
 233         __be64 rn_be = cpu_to_be64(rcd_sn);
 234         bool skip_static_post;
 235         u16 rec_seq_sz;
 236         char *rec_seq;
 237
 238         if (WARN_ON(crypto_info->cipher_type != TLS_CIPHER_AES_GCM_128))
 239                 return;
 240
 241         info = (struct tls12_crypto_info_aes_gcm_128 *)crypto_info;
 242         rec_seq = info->rec_seq;
 243         rec_seq_sz = sizeof(info->rec_seq);
 244
 245         skip_static_post = !memcmp(rec_seq, &rn_be, rec_seq_sz);
 246         if (!skip_static_post)
 247                 memcpy(rec_seq, &rn_be, rec_seq_sz);
 248
 249         mlx5e_ktls_tx_post_param_wqes(sq, priv_tx, skip_static_post, true);
 250 }
 251
 252 static int
 253 tx_post_resync_dump(struct mlx5e_txqsq *sq, skb_frag_t *frag, u32 tisn, bool first)
 254 {
 255         struct mlx5_wqe_ctrl_seg *cseg;
 256         struct mlx5_wqe_data_seg *dseg;
 257         struct mlx5e_dump_wqe *wqe;
 258         dma_addr_t dma_addr = 0;
 259         u16 ds_cnt;
 260         int fsz;
 261         u16 pi;
 262
 263         wqe = mlx5e_sq_fetch_wqe(sq, sizeof(*wqe), &pi);
 264
 265         ds_cnt = sizeof(*wqe) / MLX5_SEND_WQE_DS;
 266
 267         cseg = &wqe->ctrl;
 268         dseg = &wqe->data;
 269
 270         cseg->opmod_idx_opcode = cpu_to_be32((sq->pc << 8)  | MLX5_OPCODE_DUMP);
 271         cseg->qpn_ds           = cpu_to_be32((sq->sqn << 8) | ds_cnt);
 272         cseg->tisn             = cpu_to_be32(tisn << 8);
 273         cseg->fm_ce_se         = first ? MLX5_FENCE_MODE_INITIATOR_SMALL : 0;
 274
 275         fsz = skb_frag_size(frag);
 276         dma_addr = skb_frag_dma_map(sq->pdev, frag, 0, fsz,
 277                                     DMA_TO_DEVICE);
 278         if (unlikely(dma_mapping_error(sq->pdev, dma_addr)))
 279                 return -ENOMEM;
 280
 281         dseg->addr       = cpu_to_be64(dma_addr);
 282         dseg->lkey       = sq->mkey_be;
 283         dseg->byte_count = cpu_to_be32(fsz);
 284         mlx5e_dma_push(sq, dma_addr, fsz, MLX5E_DMA_MAP_PAGE);
 285
 286         tx_fill_wi(sq, pi, MLX5E_KTLS_DUMP_WQEBBS, fsz, skb_frag_page(frag));
 287         sq->pc += MLX5E_KTLS_DUMP_WQEBBS;
 288
 289         return 0;
 290 }
 291
 292 void mlx5e_ktls_tx_handle_resync_dump_comp(struct mlx5e_txqsq *sq,
 293                                            struct mlx5e_tx_wqe_info *wi,
 294                                            u32 *dma_fifo_cc)
 295 {
 296         struct mlx5e_sq_stats *stats;
 297         struct mlx5e_sq_dma *dma;
 298
 299         if (!wi->resync_dump_frag_page)
 300                 return;
 301
 302         dma = mlx5e_dma_get(sq, (*dma_fifo_cc)++);
 303         stats = sq->stats;
 304
 305         mlx5e_tx_dma_unmap(sq->pdev, dma);
 306         put_page(wi->resync_dump_frag_page);
 307         stats->tls_dump_packets++;
 308         stats->tls_dump_bytes += wi->num_bytes;
 309 }
 310
 311 static void tx_post_fence_nop(struct mlx5e_txqsq *sq)
 312 {
 313         struct mlx5_wq_cyc *wq = &sq->wq;
 314         u16 pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
 315
 316         tx_fill_wi(sq, pi, 1, 0, NULL);
 317
 318         mlx5e_post_nop_fence(wq, sq->sqn, &sq->pc);
 319 }
 320
 321 static struct sk_buff *
 322 mlx5e_ktls_tx_handle_ooo(struct mlx5e_ktls_offload_context_tx *priv_tx,
 323                          struct mlx5e_txqsq *sq,
 324                          struct sk_buff *skb,
 325                          u32 seq)
 326 {
 327         struct mlx5e_sq_stats *stats = sq->stats;
 328         struct mlx5_wq_cyc *wq = &sq->wq;
 329         struct tx_sync_info info = {};
 330         u16 contig_wqebbs_room, pi;
 331         u8 num_wqebbs;
 332         int i;
 333
 334         if (!tx_sync_info_get(priv_tx, seq, &info)) {
 335                 /* We might get here if a retransmission reaches the driver
 336                  * after the relevant record is acked.
 337                  * It should be safe to drop the packet in this case
 338                  */
 339                 stats->tls_drop_no_sync_data++;
 340                 goto err_out;
 341         }
 342
 343         if (unlikely(info.sync_len < 0)) {
 344                 u32 payload;
 345                 int headln;
 346
 347                 headln = skb_transport_offset(skb) + tcp_hdrlen(skb);
 348                 payload = skb->len - headln;
 349                 if (likely(payload <= -info.sync_len))
 350                         return skb;
 351
 352                 stats->tls_drop_bypass_req++;
 353                 goto err_out;
 354         }
 355
 356         stats->tls_ooo++;
 357
 358         num_wqebbs = MLX5E_KTLS_STATIC_WQEBBS + MLX5E_KTLS_PROGRESS_WQEBBS +
 359                 (info.nr_frags ? info.nr_frags * MLX5E_KTLS_DUMP_WQEBBS : 1);
 360         pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
 361         contig_wqebbs_room = mlx5_wq_cyc_get_contig_wqebbs(wq, pi);
 362         if (unlikely(contig_wqebbs_room < num_wqebbs))
 363                 mlx5e_fill_sq_frag_edge(sq, wq, pi, contig_wqebbs_room);
 364
 365         tx_post_resync_params(sq, priv_tx, info.rcd_sn);
 366
 367         for (i = 0; i < info.nr_frags; i++)
 368                 if (tx_post_resync_dump(sq, &info.frags[i], priv_tx->tisn, !i))
 369                         goto err_out;
 370
 371         /* If no dump WQE was sent, we need to have a fence NOP WQE before the
 372          * actual data xmit.
 373          */
 374         if (!info.nr_frags)
 375                 tx_post_fence_nop(sq);
 376
 377         return skb;
 378
 379 err_out:
 380         dev_kfree_skb_any(skb);
 381         return NULL;
 382 }
 383
 384 struct sk_buff *mlx5e_ktls_handle_tx_skb(struct net_device *netdev,
 385                                          struct mlx5e_txqsq *sq,
 386                                          struct sk_buff *skb,
 387                                          struct mlx5e_tx_wqe **wqe, u16 *pi)
 388 {
 389         struct mlx5e_ktls_offload_context_tx *priv_tx;
 390         struct mlx5e_sq_stats *stats = sq->stats;
 391         struct mlx5_wqe_ctrl_seg *cseg;
 392         struct tls_context *tls_ctx;
 393         int datalen;
 394         u32 seq;
 395
 396         if (!skb->sk || !tls_is_sk_tx_device_offloaded(skb->sk))
 397                 goto out;
 398
 399         datalen = skb->len - (skb_transport_offset(skb) + tcp_hdrlen(skb));
 400         if (!datalen)
 401                 goto out;
 402
 403         tls_ctx = tls_get_ctx(skb->sk);
 404         if (WARN_ON_ONCE(tls_ctx->netdev != netdev))
 405                 goto err_out;
 406
 407         priv_tx = mlx5e_get_ktls_tx_priv_ctx(tls_ctx);
 408
 409         if (unlikely(mlx5e_ktls_tx_offload_test_and_clear_pending(priv_tx))) {
 410                 mlx5e_ktls_tx_post_param_wqes(sq, priv_tx, false, false);
 411                 *wqe = mlx5e_sq_fetch_wqe(sq, sizeof(**wqe), pi);
 412                 stats->tls_ctx++;
 413         }
 414
 415         seq = ntohl(tcp_hdr(skb)->seq);
 416         if (unlikely(priv_tx->expected_seq != seq)) {
 417                 skb = mlx5e_ktls_tx_handle_ooo(priv_tx, sq, skb, seq);
 418                 if (unlikely(!skb))
 419                         goto out;
 420                 *wqe = mlx5e_sq_fetch_wqe(sq, sizeof(**wqe), pi);
 421         }
 422
 423         priv_tx->expected_seq = seq + datalen;
 424
 425         cseg = &(*wqe)->ctrl;
 426         cseg->tisn = cpu_to_be32(priv_tx->tisn << 8);
 427
 428         stats->tls_encrypted_packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
 429         stats->tls_encrypted_bytes   += datalen;
 430
 431 out:
 432         return skb;
 433
 434 err_out:
 435         dev_kfree_skb_any(skb);
 436         return NULL;
 437 }