FreeBSD/Linux Kernel Cross Reference
sys/dev/mlx5/mlx5_en/en_hw_tls_rx.h

     /*-
      * Copyright (c) 2021-2022 NVIDIA corporation & affiliates.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
      * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _MLX5_TLS_RX_H_
    #define _MLX5_TLS_RX_H_
    
    #include <linux/completion.h>
    
    #define MLX5E_TLS_RX_PROGRESS_BUFFER_SIZE 128
    
    #define MLX5E_TLS_RX_RESYNC_MAX 32      /* units */
    #define MLX5E_TLS_RX_NUM_MAX (1U << 11) /* packets */
    
    #define MLX5E_TLS_RX_TAG_LOCK(tag)      mtx_lock(&(tag)->mtx)
    #define MLX5E_TLS_RX_TAG_UNLOCK(tag)    mtx_unlock(&(tag)->mtx)
    
    #define MLX5E_TLS_RX_STAT_INC(tag, field, num) \
            counter_u64_add((tag)->tls_rx->stats.field, num)
    
    #if ((MLX5E_TLS_RX_RESYNC_MAX * MLX5E_TLS_RX_NUM_MAX) << 14) > (1U << 30)
    #error "Please lower the limits of the TLS record length database."
    #endif
    
    enum {
            MLX5E_TLS_RX_PROGRESS_PARAMS_AUTH_STATE_NO_OFFLOAD = 0,
            MLX5E_TLS_RX_PROGRESS_PARAMS_AUTH_STATE_OFFLOAD = 1,
            MLX5E_TLS_RX_PROGRESS_PARAMS_AUTH_STATE_AUTHENTICATION = 2,
    };
    
    enum {
            MLX5E_TLS_RX_PROGRESS_PARAMS_RECORD_TRACKER_STATE_START = 0,
            MLX5E_TLS_RX_PROGRESS_PARAMS_RECORD_TRACKER_STATE_TRACKING = 1,
            MLX5E_TLS_RX_PROGRESS_PARAMS_RECORD_TRACKER_STATE_SEARCHING = 2,
    };
    
    struct mlx5e_tls_rx;
    struct mlx5e_tls_rx_tag {
            struct m_snd_tag tag;
            uint32_t tirn;          /* HW TIR context number */
            uint32_t dek_index;     /* HW TLS context number */
            struct mlx5e_tls_rx *tls_rx; /* parent pointer */
            struct mlx5_flow_rule *flow_rule;
            struct mtx mtx;
            struct completion progress_complete;
            uint32_t state; /* see MLX5E_TLS_RX_ST_XXX */
    #define MLX5E_TLS_RX_ST_INIT 0
    #define MLX5E_TLS_RX_ST_SETUP 1
    #define MLX5E_TLS_RX_ST_READY 2
    #define MLX5E_TLS_RX_ST_RELEASE 3
    #define MLX5E_TLS_RX_ST_FREED 4
    
            /*
             * The following fields are used to store the TCP starting
             * point of TLS records in the past. When TLS records of same
             * length are back to back the tcp_resync_num[] is incremented
             * instead of creating new entries. This way up to
             * "MLX5E_TLS_RX_RESYNC_MAX" * "MLX5E_TLS_RX_NUM_MAX" * 16
             * KBytes, around 1GByte worth of TCP data, may be remembered
             * in the good case. The amount of history should not exceed
             * 2GBytes of TCP data, because then the TCP sequence numbers
             * may wrap around.
             *
             * This information is used to tell if a given TCP sequence
             * number is a valid TLS record or not.
             */
            uint64_t rcd_resync_start;      /* starting TLS record number */
            uint32_t tcp_resync_start;      /* starting TCP sequence number */
            uint32_t tcp_resync_next;       /* next expected TCP sequence number */
            uint32_t tcp_resync_len[MLX5E_TLS_RX_RESYNC_MAX];
            uint32_t tcp_resync_num[MLX5E_TLS_RX_RESYNC_MAX];
            uint16_t tcp_resync_pc;         /* producer counter for arrays above */
            uint16_t tcp_resync_cc;         /* consumer counter for arrays above */
    
            struct work_struct work;
    
           uint32_t flowid;
           uint32_t flowtype;
           uint32_t dek_index_ok:1;
           uint32_t tcp_resync_active:1;
           uint32_t tcp_resync_pending:1;
   
           /* parameters needed */
           uint8_t crypto_params[128] __aligned(4);
           uint8_t rx_progress[MLX5E_TLS_RX_PROGRESS_BUFFER_SIZE * 2];
   } __aligned(MLX5E_CACHELINE_SIZE);
   
   static inline void *
   mlx5e_tls_rx_get_progress_buffer(struct mlx5e_tls_rx_tag *ptag)
   {
           /* return properly aligned RX buffer */
           return (ptag->rx_progress +
               ((-(uintptr_t)ptag->rx_progress) &
               (MLX5E_TLS_RX_PROGRESS_BUFFER_SIZE - 1)));
   }
   
   #define MLX5E_TLS_RX_STATS(m) \
     m(+1, u64, rx_resync_ok, "rx_resync_ok", "Successful resync requests")\
     m(+1, u64, rx_resync_err, "rx_resync_err", "Failed resync requests")\
     m(+1, u64, rx_error, "rx_error", "Other errors")
   
   #define MLX5E_TLS_RX_STATS_NUM (0 MLX5E_TLS_RX_STATS(MLX5E_STATS_COUNT))
   
   struct mlx5e_tls_rx_stats {
           struct  sysctl_ctx_list ctx;
           counter_u64_t   arg[0];
           MLX5E_TLS_RX_STATS(MLX5E_STATS_COUNTER)
   };
   
   struct mlx5e_tls_rx {
           struct sysctl_ctx_list ctx;
           struct mlx5e_tls_rx_stats stats;
           struct workqueue_struct *wq;
           uma_zone_t zone;
           uint32_t max_resources;         /* max number of resources */
           volatile uint32_t num_resources;        /* current number of resources */
           int init;                       /* set when ready */
           char zname[32];
   };
   
   int mlx5e_tls_rx_init(struct mlx5e_priv *);
   void mlx5e_tls_rx_cleanup(struct mlx5e_priv *);
   
   if_snd_tag_alloc_t mlx5e_tls_rx_snd_tag_alloc;
   
   #endif          /* _MLX5_TLS_RX_H_ */

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