/* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright (C) 2020 Chelsio Communications.  All rights reserved. */

#ifndef __CHCR_COMMON_H__
#define __CHCR_COMMON_H__

#include "cxgb4.h"

#define CHCR_MAX_SALT                      4
#define CHCR_KEYCTX_MAC_KEY_SIZE_128       0
#define CHCR_KEYCTX_CIPHER_KEY_SIZE_128    0
#define CHCR_SCMD_CIPHER_MODE_AES_GCM      2
#define CHCR_SCMD_CIPHER_MODE_AES_CTR      3
#define CHCR_CPL_TX_SEC_PDU_LEN_64BIT      2
#define CHCR_SCMD_SEQ_NO_CTRL_64BIT        3
#define CHCR_SCMD_PROTO_VERSION_TLS        0
#define CHCR_SCMD_PROTO_VERSION_GENERIC    4
#define CHCR_SCMD_AUTH_MODE_GHASH          4
#define AES_BLOCK_LEN                      16

struct ktls_key_ctx {
        __be32 ctx_hdr;
        u8 salt[CHCR_MAX_SALT];
        __be64 iv_to_auth;
        unsigned char key[TLS_CIPHER_AES_GCM_128_KEY_SIZE +
                          TLS_CIPHER_AES_GCM_256_TAG_SIZE];
};

/* Crypto key context */
#define KEY_CONTEXT_CTX_LEN_S           24
#define KEY_CONTEXT_CTX_LEN_V(x)        ((x) << KEY_CONTEXT_CTX_LEN_S)

#define KEY_CONTEXT_SALT_PRESENT_S      10
#define KEY_CONTEXT_SALT_PRESENT_V(x)   ((x) << KEY_CONTEXT_SALT_PRESENT_S)
#define KEY_CONTEXT_SALT_PRESENT_F      KEY_CONTEXT_SALT_PRESENT_V(1U)

#define KEY_CONTEXT_VALID_S     0
#define KEY_CONTEXT_VALID_V(x)  ((x) << KEY_CONTEXT_VALID_S)
#define KEY_CONTEXT_VALID_F     KEY_CONTEXT_VALID_V(1U)

#define KEY_CONTEXT_CK_SIZE_S           6
#define KEY_CONTEXT_CK_SIZE_V(x)        ((x) << KEY_CONTEXT_CK_SIZE_S)

#define KEY_CONTEXT_MK_SIZE_S           2
#define KEY_CONTEXT_MK_SIZE_V(x)        ((x) << KEY_CONTEXT_MK_SIZE_S)

#define KEY_CONTEXT_OPAD_PRESENT_S      11
#define KEY_CONTEXT_OPAD_PRESENT_V(x)   ((x) << KEY_CONTEXT_OPAD_PRESENT_S)
#define KEY_CONTEXT_OPAD_PRESENT_F      KEY_CONTEXT_OPAD_PRESENT_V(1U)

#define FILL_KEY_CTX_HDR(ck_size, mk_size, ctx_len) \
                htonl(KEY_CONTEXT_MK_SIZE_V(mk_size) | \
                      KEY_CONTEXT_CK_SIZE_V(ck_size) | \
                      KEY_CONTEXT_VALID_F | \
                      KEY_CONTEXT_SALT_PRESENT_F | \
                      KEY_CONTEXT_CTX_LEN_V((ctx_len)))

static inline void *chcr_copy_to_txd(const void *src, const struct sge_txq *q,
                                     void *pos, int length)
{
        int left = (void *)q->stat - pos;
        u64 *p;

        if (likely(length <= left)) {
                memcpy(pos, src, length);
                pos += length;
        } else {
                memcpy(pos, src, left);
                memcpy(q->desc, src + left, length - left);
                pos = (void *)q->desc + (length - left);
        }
        /* 0-pad to multiple of 16 */
        p = PTR_ALIGN(pos, 8);
        if ((uintptr_t)p & 8) {
                *p = 0;
                return p + 1;
        }
        return p;
}

static inline unsigned int chcr_txq_avail(const struct sge_txq *q)
{
        return q->size - 1 - q->in_use;
}

static inline void chcr_txq_advance(struct sge_txq *q, unsigned int n)
{
        q->in_use += n;
        q->pidx += n;
        if (q->pidx >= q->size)
                q->pidx -= q->size;
}

static inline void chcr_eth_txq_stop(struct sge_eth_txq *q)
{
        netif_tx_stop_queue(q->txq);
        q->q.stops++;
}

static inline unsigned int chcr_sgl_len(unsigned int n)
{
        n--;
        return (3 * n) / 2 + (n & 1) + 2;
}

static inline unsigned int chcr_flits_to_desc(unsigned int n)
{
        WARN_ON(n > SGE_MAX_WR_LEN / 8);
        return DIV_ROUND_UP(n, 8);
}
#endif /* __CHCR_COMMON_H__ */