/*
 * Copyright (c) 2016 Chelsio Communications, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation.
 *
 */

#ifndef __CXGBIT_LRO_H__
#define __CXGBIT_LRO_H__

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/skbuff.h>

#define LRO_FLUSH_LEN_MAX       65535

struct cxgbit_lro_cb {
        struct cxgbit_sock *csk;
        u32 pdu_totallen;
        u32 offset;
        u8 pdu_idx;
        bool complete;
};

enum cxgbit_pducb_flags {
        PDUCBF_RX_HDR           = (1 << 0), /* received pdu header */
        PDUCBF_RX_DATA          = (1 << 1), /* received pdu payload */
        PDUCBF_RX_STATUS        = (1 << 2), /* received ddp status */
        PDUCBF_RX_DATA_DDPD     = (1 << 3), /* pdu payload ddp'd */
        PDUCBF_RX_DDP_CMP       = (1 << 4), /* ddp completion */
        PDUCBF_RX_HCRC_ERR      = (1 << 5), /* header digest error */
        PDUCBF_RX_DCRC_ERR      = (1 << 6), /* data digest error */
};

struct cxgbit_lro_pdu_cb {
        u8 flags;
        u8 frags;
        u8 hfrag_idx;
        u8 nr_dfrags;
        u8 dfrag_idx;
        bool complete;
        u32 seq;
        u32 pdulen;
        u32 hlen;
        u32 dlen;
        u32 doffset;
        u32 ddigest;
        void *hdr;
};

#define LRO_SKB_MAX_HEADROOM  \
                (sizeof(struct cxgbit_lro_cb) + \
                 (MAX_SKB_FRAGS * sizeof(struct cxgbit_lro_pdu_cb)))

#define LRO_SKB_MIN_HEADROOM  \
                (sizeof(struct cxgbit_lro_cb) + \
                 sizeof(struct cxgbit_lro_pdu_cb))

#define cxgbit_skb_lro_cb(skb)  ((struct cxgbit_lro_cb *)skb->data)
#define cxgbit_skb_lro_pdu_cb(skb, i)   \
        ((struct cxgbit_lro_pdu_cb *)(skb->data + sizeof(struct cxgbit_lro_cb) \
                + (i * sizeof(struct cxgbit_lro_pdu_cb))))

#define CPL_RX_ISCSI_DDP_STATUS_DDP_SHIFT       16 /* ddp'able */
#define CPL_RX_ISCSI_DDP_STATUS_PAD_SHIFT       19 /* pad error */
#define CPL_RX_ISCSI_DDP_STATUS_HCRC_SHIFT      20 /* hcrc error */
#define CPL_RX_ISCSI_DDP_STATUS_DCRC_SHIFT      21 /* dcrc error */

#endif  /*__CXGBIT_LRO_H_*/