drivers/target/iscsi/cxgbit/cxgbit_lro.h

   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
  21 struct cxgbit_lro_cb {
  22         struct cxgbit_sock *csk;
  23         u32 pdu_totallen;
  24         u32 offset;
  25         u8 pdu_idx;
  26         bool complete;
  27 };
  28
  29 enum 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
  39 struct 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_*/