LXR linux/drivers/target/iscsi/cxgbit/cxgbit

   1/*
   2 * Copyright (c) 2016 Chelsio Communications, Inc.
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation.
   7 *
   8 */
   9
  10#ifndef __CXGBIT_LRO_H__
  11#define __CXGBIT_LRO_H__
  12
  13#include <linux/kernel.h>
  14#include <linux/module.h>
  15#include <linux/errno.h>
  16#include <linux/types.h>
  17#include <linux/skbuff.h>
  18
  19#define LRO_FLUSH_LEN_MAX       65535
  20
  21struct cxgbit_lro_cb {
  22        struct cxgbit_sock *csk;
  23        u32 pdu_totallen;
  24        u32 offset;
  25        u8 pdu_idx;
  26        bool complete;
  27};
  28
  29enum cxgbit_pducb_flags {
  30        PDUCBF_RX_HDR           = (1 << 0), /* received pdu header */
  31        PDUCBF_RX_DATA          = (1 << 1), /* received pdu payload */
  32        PDUCBF_RX_STATUS        = (1 << 2), /* received ddp status */
  33        PDUCBF_RX_DATA_DDPD     = (1 << 3), /* pdu payload ddp'd */
  34        PDUCBF_RX_DDP_CMP       = (1 << 4), /* ddp completion */
  35        PDUCBF_RX_HCRC_ERR      = (1 << 5), /* header digest error */
  36        PDUCBF_RX_DCRC_ERR      = (1 << 6), /* data digest error */
  37};
  38
  39struct cxgbit_lro_pdu_cb {
  40        u8 flags;
  41        u8 frags;
  42        u8 hfrag_idx;
  43        u8 nr_dfrags;
  44        u8 dfrag_idx;
  45        bool complete;
  46        u32 seq;
  47        u32 pdulen;
  48        u32 hlen;
  49        u32 dlen;
  50        u32 doffset;
  51        u32 ddigest;
  52        void *hdr;
  53};
  54
  55#define LRO_SKB_MAX_HEADROOM  \
  56                (sizeof(struct cxgbit_lro_cb) + \
  57                 (MAX_SKB_FRAGS * sizeof(struct cxgbit_lro_pdu_cb)))
  58
  59#define LRO_SKB_MIN_HEADROOM  \
  60                (sizeof(struct cxgbit_lro_cb) + \
  61                 sizeof(struct cxgbit_lro_pdu_cb))
  62
  63#define cxgbit_skb_lro_cb(skb)  ((struct cxgbit_lro_cb *)skb->data)
  64#define cxgbit_skb_lro_pdu_cb(skb, i)   \
  65        ((struct cxgbit_lro_pdu_cb *)(skb->data + sizeof(struct cxgbit_lro_cb) \
  66                + (i * sizeof(struct cxgbit_lro_pdu_cb))))
  67
  68#define CPL_RX_ISCSI_DDP_STATUS_DDP_SHIFT       16 /* ddp'able */
  69#define CPL_RX_ISCSI_DDP_STATUS_PAD_SHIFT       19 /* pad error */
  70#define CPL_RX_ISCSI_DDP_STATUS_HCRC_SHIFT      20 /* hcrc error */
  71#define CPL_RX_ISCSI_DDP_STATUS_DCRC_SHIFT      21 /* dcrc error */
  72
  73#endif  /*__CXGBIT_LRO_H_*/
  74