620 строки
17 KiB
C
620 строки
17 KiB
C
/*
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* libcxgbi.h: Chelsio common library for T3/T4 iSCSI driver.
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*
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* Copyright (c) 2010-2015 Chelsio Communications, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation.
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*
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* Written by: Karen Xie (kxie@chelsio.com)
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* Written by: Rakesh Ranjan (rranjan@chelsio.com)
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*/
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#ifndef __LIBCXGBI_H__
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#define __LIBCXGBI_H__
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/debugfs.h>
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#include <linux/list.h>
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#include <linux/netdevice.h>
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#include <linux/if_vlan.h>
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#include <linux/scatterlist.h>
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#include <linux/skbuff.h>
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#include <linux/vmalloc.h>
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#include <linux/version.h>
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#include <scsi/scsi_device.h>
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#include <scsi/libiscsi_tcp.h>
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#include <libcxgb_ppm.h>
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enum cxgbi_dbg_flag {
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CXGBI_DBG_ISCSI,
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CXGBI_DBG_DDP,
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CXGBI_DBG_TOE,
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CXGBI_DBG_SOCK,
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CXGBI_DBG_PDU_TX,
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CXGBI_DBG_PDU_RX,
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CXGBI_DBG_DEV,
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};
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#define log_debug(level, fmt, ...) \
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do { \
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if (dbg_level & (level)) \
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pr_info(fmt, ##__VA_ARGS__); \
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} while (0)
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#define pr_info_ipaddr(fmt_trail, \
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addr1, addr2, args_trail...) \
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do { \
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if (!((1 << CXGBI_DBG_SOCK) & dbg_level)) \
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break; \
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pr_info("%pISpc - %pISpc, " fmt_trail, \
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addr1, addr2, args_trail); \
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} while (0)
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/* max. connections per adapter */
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#define CXGBI_MAX_CONN 16384
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/* always allocate rooms for AHS */
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#define SKB_TX_ISCSI_PDU_HEADER_MAX \
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(sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE)
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#define ISCSI_PDU_NONPAYLOAD_LEN 312 /* bhs(48) + ahs(256) + digest(8)*/
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/*
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* align pdu size to multiple of 512 for better performance
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*/
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#define cxgbi_align_pdu_size(n) do { n = (n) & (~511); } while (0)
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#define ULP2_MODE_ISCSI 2
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#define ULP2_MAX_PKT_SIZE 16224
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#define ULP2_MAX_PDU_PAYLOAD \
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(ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_LEN)
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/*
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* For iscsi connections HW may inserts digest bytes into the pdu. Those digest
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* bytes are not sent by the host but are part of the TCP payload and therefore
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* consume TCP sequence space.
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*/
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static const unsigned int ulp2_extra_len[] = { 0, 4, 4, 8 };
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static inline unsigned int cxgbi_ulp_extra_len(int submode)
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{
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return ulp2_extra_len[submode & 3];
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}
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#define CPL_RX_DDP_STATUS_DDP_SHIFT 16 /* ddp'able */
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#define CPL_RX_DDP_STATUS_PAD_SHIFT 19 /* pad error */
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#define CPL_RX_DDP_STATUS_HCRC_SHIFT 20 /* hcrc error */
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#define CPL_RX_DDP_STATUS_DCRC_SHIFT 21 /* dcrc error */
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/*
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* sge_opaque_hdr -
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* Opaque version of structure the SGE stores at skb->head of TX_DATA packets
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* and for which we must reserve space.
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*/
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struct sge_opaque_hdr {
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void *dev;
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dma_addr_t addr[MAX_SKB_FRAGS + 1];
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};
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struct cxgbi_sock {
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struct cxgbi_device *cdev;
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int tid;
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int atid;
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unsigned long flags;
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unsigned int mtu;
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unsigned short rss_qid;
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unsigned short txq_idx;
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unsigned short advmss;
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unsigned int tx_chan;
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unsigned int rx_chan;
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unsigned int mss_idx;
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unsigned int smac_idx;
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unsigned char port_id;
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int wr_max_cred;
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int wr_cred;
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int wr_una_cred;
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unsigned char hcrc_len;
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unsigned char dcrc_len;
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void *l2t;
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struct sk_buff *wr_pending_head;
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struct sk_buff *wr_pending_tail;
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struct sk_buff *cpl_close;
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struct sk_buff *cpl_abort_req;
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struct sk_buff *cpl_abort_rpl;
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struct sk_buff *skb_ulp_lhdr;
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spinlock_t lock;
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struct kref refcnt;
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unsigned int state;
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unsigned int csk_family;
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union {
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struct sockaddr_in saddr;
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struct sockaddr_in6 saddr6;
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};
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union {
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struct sockaddr_in daddr;
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struct sockaddr_in6 daddr6;
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};
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struct dst_entry *dst;
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struct sk_buff_head receive_queue;
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struct sk_buff_head write_queue;
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struct timer_list retry_timer;
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int err;
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rwlock_t callback_lock;
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void *user_data;
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u32 rcv_nxt;
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u32 copied_seq;
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u32 rcv_wup;
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u32 snd_nxt;
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u32 snd_una;
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u32 write_seq;
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u32 snd_win;
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u32 rcv_win;
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};
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/*
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* connection states
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*/
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enum cxgbi_sock_states{
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CTP_CLOSED,
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CTP_CONNECTING,
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CTP_ACTIVE_OPEN,
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CTP_ESTABLISHED,
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CTP_ACTIVE_CLOSE,
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CTP_PASSIVE_CLOSE,
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CTP_CLOSE_WAIT_1,
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CTP_CLOSE_WAIT_2,
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CTP_ABORTING,
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};
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/*
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* Connection flags -- many to track some close related events.
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*/
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enum cxgbi_sock_flags {
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CTPF_ABORT_RPL_RCVD, /*received one ABORT_RPL_RSS message */
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CTPF_ABORT_REQ_RCVD, /*received one ABORT_REQ_RSS message */
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CTPF_ABORT_RPL_PENDING, /* expecting an abort reply */
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CTPF_TX_DATA_SENT, /* already sent a TX_DATA WR */
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CTPF_ACTIVE_CLOSE_NEEDED,/* need to be closed */
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CTPF_HAS_ATID, /* reserved atid */
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CTPF_HAS_TID, /* reserved hw tid */
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CTPF_OFFLOAD_DOWN, /* offload function off */
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};
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struct cxgbi_skb_rx_cb {
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__u32 ddigest;
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__u32 pdulen;
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};
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struct cxgbi_skb_tx_cb {
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void *l2t;
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struct sk_buff *wr_next;
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};
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enum cxgbi_skcb_flags {
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SKCBF_TX_NEED_HDR, /* packet needs a header */
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SKCBF_TX_MEM_WRITE, /* memory write */
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SKCBF_TX_FLAG_COMPL, /* wr completion flag */
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SKCBF_RX_COALESCED, /* received whole pdu */
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SKCBF_RX_HDR, /* received pdu header */
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SKCBF_RX_DATA, /* received pdu payload */
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SKCBF_RX_STATUS, /* received ddp status */
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SKCBF_RX_ISCSI_COMPL, /* received iscsi completion */
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SKCBF_RX_DATA_DDPD, /* pdu payload ddp'd */
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SKCBF_RX_HCRC_ERR, /* header digest error */
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SKCBF_RX_DCRC_ERR, /* data digest error */
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SKCBF_RX_PAD_ERR, /* padding byte error */
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};
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struct cxgbi_skb_cb {
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unsigned char ulp_mode;
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unsigned long flags;
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unsigned int seq;
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union {
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struct cxgbi_skb_rx_cb rx;
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struct cxgbi_skb_tx_cb tx;
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};
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};
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#define CXGBI_SKB_CB(skb) ((struct cxgbi_skb_cb *)&((skb)->cb[0]))
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#define cxgbi_skcb_flags(skb) (CXGBI_SKB_CB(skb)->flags)
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#define cxgbi_skcb_ulp_mode(skb) (CXGBI_SKB_CB(skb)->ulp_mode)
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#define cxgbi_skcb_tcp_seq(skb) (CXGBI_SKB_CB(skb)->seq)
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#define cxgbi_skcb_rx_ddigest(skb) (CXGBI_SKB_CB(skb)->rx.ddigest)
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#define cxgbi_skcb_rx_pdulen(skb) (CXGBI_SKB_CB(skb)->rx.pdulen)
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#define cxgbi_skcb_tx_wr_next(skb) (CXGBI_SKB_CB(skb)->tx.wr_next)
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static inline void cxgbi_skcb_set_flag(struct sk_buff *skb,
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enum cxgbi_skcb_flags flag)
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{
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__set_bit(flag, &(cxgbi_skcb_flags(skb)));
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}
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static inline void cxgbi_skcb_clear_flag(struct sk_buff *skb,
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enum cxgbi_skcb_flags flag)
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{
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__clear_bit(flag, &(cxgbi_skcb_flags(skb)));
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}
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static inline int cxgbi_skcb_test_flag(const struct sk_buff *skb,
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enum cxgbi_skcb_flags flag)
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{
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return test_bit(flag, &(cxgbi_skcb_flags(skb)));
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}
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static inline void cxgbi_sock_set_flag(struct cxgbi_sock *csk,
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enum cxgbi_sock_flags flag)
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{
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__set_bit(flag, &csk->flags);
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log_debug(1 << CXGBI_DBG_SOCK,
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"csk 0x%p,%u,0x%lx, bit %d.\n",
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csk, csk->state, csk->flags, flag);
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}
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static inline void cxgbi_sock_clear_flag(struct cxgbi_sock *csk,
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enum cxgbi_sock_flags flag)
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{
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__clear_bit(flag, &csk->flags);
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log_debug(1 << CXGBI_DBG_SOCK,
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"csk 0x%p,%u,0x%lx, bit %d.\n",
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csk, csk->state, csk->flags, flag);
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}
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static inline int cxgbi_sock_flag(struct cxgbi_sock *csk,
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enum cxgbi_sock_flags flag)
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{
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if (csk == NULL)
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return 0;
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return test_bit(flag, &csk->flags);
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}
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static inline void cxgbi_sock_set_state(struct cxgbi_sock *csk, int state)
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{
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log_debug(1 << CXGBI_DBG_SOCK,
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"csk 0x%p,%u,0x%lx, state -> %u.\n",
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csk, csk->state, csk->flags, state);
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csk->state = state;
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}
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static inline void cxgbi_sock_free(struct kref *kref)
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{
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struct cxgbi_sock *csk = container_of(kref,
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struct cxgbi_sock,
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refcnt);
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if (csk) {
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log_debug(1 << CXGBI_DBG_SOCK,
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"free csk 0x%p, state %u, flags 0x%lx\n",
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csk, csk->state, csk->flags);
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kfree(csk);
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}
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}
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static inline void __cxgbi_sock_put(const char *fn, struct cxgbi_sock *csk)
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{
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log_debug(1 << CXGBI_DBG_SOCK,
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"%s, put csk 0x%p, ref %u-1.\n",
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fn, csk, atomic_read(&csk->refcnt.refcount));
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kref_put(&csk->refcnt, cxgbi_sock_free);
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}
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#define cxgbi_sock_put(csk) __cxgbi_sock_put(__func__, csk)
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static inline void __cxgbi_sock_get(const char *fn, struct cxgbi_sock *csk)
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{
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log_debug(1 << CXGBI_DBG_SOCK,
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"%s, get csk 0x%p, ref %u+1.\n",
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fn, csk, atomic_read(&csk->refcnt.refcount));
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kref_get(&csk->refcnt);
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}
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#define cxgbi_sock_get(csk) __cxgbi_sock_get(__func__, csk)
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static inline int cxgbi_sock_is_closing(struct cxgbi_sock *csk)
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{
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return csk->state >= CTP_ACTIVE_CLOSE;
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}
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static inline int cxgbi_sock_is_established(struct cxgbi_sock *csk)
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{
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return csk->state == CTP_ESTABLISHED;
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}
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static inline void cxgbi_sock_purge_write_queue(struct cxgbi_sock *csk)
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{
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struct sk_buff *skb;
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while ((skb = __skb_dequeue(&csk->write_queue)))
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__kfree_skb(skb);
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}
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static inline unsigned int cxgbi_sock_compute_wscale(unsigned int win)
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{
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unsigned int wscale = 0;
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while (wscale < 14 && (65535 << wscale) < win)
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wscale++;
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return wscale;
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}
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static inline struct sk_buff *alloc_wr(int wrlen, int dlen, gfp_t gfp)
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{
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struct sk_buff *skb = alloc_skb(wrlen + dlen, gfp);
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if (skb) {
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__skb_put(skb, wrlen);
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memset(skb->head, 0, wrlen + dlen);
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} else
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pr_info("alloc cpl wr skb %u+%u, OOM.\n", wrlen, dlen);
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return skb;
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}
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/*
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* The number of WRs needed for an skb depends on the number of fragments
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* in the skb and whether it has any payload in its main body. This maps the
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* length of the gather list represented by an skb into the # of necessary WRs.
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* The extra two fragments are for iscsi bhs and payload padding.
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*/
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#define SKB_WR_LIST_SIZE (MAX_SKB_FRAGS + 2)
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static inline void cxgbi_sock_reset_wr_list(struct cxgbi_sock *csk)
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{
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csk->wr_pending_head = csk->wr_pending_tail = NULL;
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}
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static inline void cxgbi_sock_enqueue_wr(struct cxgbi_sock *csk,
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struct sk_buff *skb)
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{
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cxgbi_skcb_tx_wr_next(skb) = NULL;
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/*
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* We want to take an extra reference since both us and the driver
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* need to free the packet before it's really freed. We know there's
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* just one user currently so we use atomic_set rather than skb_get
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* to avoid the atomic op.
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*/
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atomic_set(&skb->users, 2);
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if (!csk->wr_pending_head)
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csk->wr_pending_head = skb;
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else
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cxgbi_skcb_tx_wr_next(csk->wr_pending_tail) = skb;
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csk->wr_pending_tail = skb;
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}
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static inline int cxgbi_sock_count_pending_wrs(const struct cxgbi_sock *csk)
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{
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int n = 0;
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const struct sk_buff *skb = csk->wr_pending_head;
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while (skb) {
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n += skb->csum;
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skb = cxgbi_skcb_tx_wr_next(skb);
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}
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return n;
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}
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static inline struct sk_buff *cxgbi_sock_peek_wr(const struct cxgbi_sock *csk)
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{
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return csk->wr_pending_head;
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}
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static inline struct sk_buff *cxgbi_sock_dequeue_wr(struct cxgbi_sock *csk)
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{
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struct sk_buff *skb = csk->wr_pending_head;
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if (likely(skb)) {
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csk->wr_pending_head = cxgbi_skcb_tx_wr_next(skb);
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cxgbi_skcb_tx_wr_next(skb) = NULL;
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}
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return skb;
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}
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void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *);
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void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *);
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void cxgbi_sock_skb_entail(struct cxgbi_sock *, struct sk_buff *);
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void cxgbi_sock_fail_act_open(struct cxgbi_sock *, int);
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void cxgbi_sock_act_open_req_arp_failure(void *, struct sk_buff *);
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void cxgbi_sock_closed(struct cxgbi_sock *);
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void cxgbi_sock_established(struct cxgbi_sock *, unsigned int, unsigned int);
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void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *);
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void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *);
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void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *, u32);
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void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *, unsigned int, unsigned int,
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int);
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unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *, unsigned int);
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void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *);
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struct cxgbi_hba {
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struct net_device *ndev;
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struct net_device *vdev; /* vlan dev */
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struct Scsi_Host *shost;
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struct cxgbi_device *cdev;
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__be32 ipv4addr;
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unsigned char port_id;
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};
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struct cxgbi_ports_map {
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unsigned int max_connect;
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unsigned int used;
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unsigned short sport_base;
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spinlock_t lock;
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unsigned int next;
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struct cxgbi_sock **port_csk;
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};
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#define CXGBI_FLAG_DEV_T3 0x1
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#define CXGBI_FLAG_DEV_T4 0x2
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#define CXGBI_FLAG_ADAPTER_RESET 0x4
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#define CXGBI_FLAG_IPV4_SET 0x10
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#define CXGBI_FLAG_USE_PPOD_OFLDQ 0x40
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#define CXGBI_FLAG_DDP_OFF 0x100
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struct cxgbi_device {
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struct list_head list_head;
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struct list_head rcu_node;
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unsigned int flags;
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struct net_device **ports;
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void *lldev;
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struct cxgbi_hba **hbas;
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const unsigned short *mtus;
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unsigned char nmtus;
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unsigned char nports;
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struct pci_dev *pdev;
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struct dentry *debugfs_root;
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struct iscsi_transport *itp;
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struct module *owner;
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unsigned int pfvf;
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unsigned int rx_credit_thres;
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unsigned int skb_tx_rsvd;
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unsigned int skb_rx_extra; /* for msg coalesced mode */
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|
unsigned int tx_max_size;
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|
unsigned int rx_max_size;
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|
struct cxgbi_ports_map pmap;
|
|
|
|
void (*dev_ddp_cleanup)(struct cxgbi_device *);
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|
struct cxgbi_ppm* (*cdev2ppm)(struct cxgbi_device *);
|
|
int (*csk_ddp_set_map)(struct cxgbi_ppm *, struct cxgbi_sock *,
|
|
struct cxgbi_task_tag_info *);
|
|
void (*csk_ddp_clear_map)(struct cxgbi_device *cdev,
|
|
struct cxgbi_ppm *,
|
|
struct cxgbi_task_tag_info *);
|
|
int (*csk_ddp_setup_digest)(struct cxgbi_sock *,
|
|
unsigned int, int, int, int);
|
|
int (*csk_ddp_setup_pgidx)(struct cxgbi_sock *,
|
|
unsigned int, int, bool);
|
|
|
|
void (*csk_release_offload_resources)(struct cxgbi_sock *);
|
|
int (*csk_rx_pdu_ready)(struct cxgbi_sock *, struct sk_buff *);
|
|
u32 (*csk_send_rx_credits)(struct cxgbi_sock *, u32);
|
|
int (*csk_push_tx_frames)(struct cxgbi_sock *, int);
|
|
void (*csk_send_abort_req)(struct cxgbi_sock *);
|
|
void (*csk_send_close_req)(struct cxgbi_sock *);
|
|
int (*csk_alloc_cpls)(struct cxgbi_sock *);
|
|
int (*csk_init_act_open)(struct cxgbi_sock *);
|
|
|
|
void *dd_data;
|
|
};
|
|
#define cxgbi_cdev_priv(cdev) ((cdev)->dd_data)
|
|
|
|
struct cxgbi_conn {
|
|
struct cxgbi_endpoint *cep;
|
|
struct iscsi_conn *iconn;
|
|
struct cxgbi_hba *chba;
|
|
u32 task_idx_bits;
|
|
unsigned int ddp_full;
|
|
unsigned int ddp_tag_full;
|
|
};
|
|
|
|
struct cxgbi_endpoint {
|
|
struct cxgbi_conn *cconn;
|
|
struct cxgbi_hba *chba;
|
|
struct cxgbi_sock *csk;
|
|
};
|
|
|
|
#define MAX_PDU_FRAGS ((ULP2_MAX_PDU_PAYLOAD + 512 - 1) / 512)
|
|
struct cxgbi_task_data {
|
|
unsigned short nr_frags;
|
|
struct page_frag frags[MAX_PDU_FRAGS];
|
|
struct sk_buff *skb;
|
|
unsigned int dlen;
|
|
unsigned int offset;
|
|
unsigned int count;
|
|
unsigned int sgoffset;
|
|
struct cxgbi_task_tag_info ttinfo;
|
|
};
|
|
#define iscsi_task_cxgbi_data(task) \
|
|
((task)->dd_data + sizeof(struct iscsi_tcp_task))
|
|
|
|
static inline void *cxgbi_alloc_big_mem(unsigned int size,
|
|
gfp_t gfp)
|
|
{
|
|
void *p = kzalloc(size, gfp | __GFP_NOWARN);
|
|
|
|
if (!p)
|
|
p = vzalloc(size);
|
|
|
|
return p;
|
|
}
|
|
|
|
static inline void cxgbi_free_big_mem(void *addr)
|
|
{
|
|
kvfree(addr);
|
|
}
|
|
|
|
static inline void cxgbi_set_iscsi_ipv4(struct cxgbi_hba *chba, __be32 ipaddr)
|
|
{
|
|
if (chba->cdev->flags & CXGBI_FLAG_IPV4_SET)
|
|
chba->ipv4addr = ipaddr;
|
|
else
|
|
pr_info("set iscsi ipv4 NOT supported, using %s ipv4.\n",
|
|
chba->ndev->name);
|
|
}
|
|
|
|
struct cxgbi_device *cxgbi_device_register(unsigned int, unsigned int);
|
|
void cxgbi_device_unregister(struct cxgbi_device *);
|
|
void cxgbi_device_unregister_all(unsigned int flag);
|
|
struct cxgbi_device *cxgbi_device_find_by_lldev(void *);
|
|
struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *, int *);
|
|
struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *,
|
|
int *);
|
|
int cxgbi_hbas_add(struct cxgbi_device *, u64, unsigned int,
|
|
struct scsi_host_template *,
|
|
struct scsi_transport_template *);
|
|
void cxgbi_hbas_remove(struct cxgbi_device *);
|
|
|
|
int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
|
|
unsigned int max_conn);
|
|
void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev);
|
|
|
|
void cxgbi_conn_tx_open(struct cxgbi_sock *);
|
|
void cxgbi_conn_pdu_ready(struct cxgbi_sock *);
|
|
int cxgbi_conn_alloc_pdu(struct iscsi_task *, u8);
|
|
int cxgbi_conn_init_pdu(struct iscsi_task *, unsigned int , unsigned int);
|
|
int cxgbi_conn_xmit_pdu(struct iscsi_task *);
|
|
|
|
void cxgbi_cleanup_task(struct iscsi_task *task);
|
|
|
|
umode_t cxgbi_attr_is_visible(int param_type, int param);
|
|
void cxgbi_get_conn_stats(struct iscsi_cls_conn *, struct iscsi_stats *);
|
|
int cxgbi_set_conn_param(struct iscsi_cls_conn *,
|
|
enum iscsi_param, char *, int);
|
|
int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param, char *);
|
|
struct iscsi_cls_conn *cxgbi_create_conn(struct iscsi_cls_session *, u32);
|
|
int cxgbi_bind_conn(struct iscsi_cls_session *,
|
|
struct iscsi_cls_conn *, u64, int);
|
|
void cxgbi_destroy_session(struct iscsi_cls_session *);
|
|
struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *,
|
|
u16, u16, u32);
|
|
int cxgbi_set_host_param(struct Scsi_Host *,
|
|
enum iscsi_host_param, char *, int);
|
|
int cxgbi_get_host_param(struct Scsi_Host *, enum iscsi_host_param, char *);
|
|
struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *,
|
|
struct sockaddr *, int);
|
|
int cxgbi_ep_poll(struct iscsi_endpoint *, int);
|
|
void cxgbi_ep_disconnect(struct iscsi_endpoint *);
|
|
|
|
int cxgbi_iscsi_init(struct iscsi_transport *,
|
|
struct scsi_transport_template **);
|
|
void cxgbi_iscsi_cleanup(struct iscsi_transport *,
|
|
struct scsi_transport_template **);
|
|
void cxgbi_parse_pdu_itt(struct iscsi_conn *, itt_t, int *, int *);
|
|
int cxgbi_ddp_init(struct cxgbi_device *, unsigned int, unsigned int,
|
|
unsigned int, unsigned int);
|
|
int cxgbi_ddp_cleanup(struct cxgbi_device *);
|
|
void cxgbi_ddp_page_size_factor(int *);
|
|
void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *,
|
|
struct cxgbi_task_tag_info *,
|
|
struct scatterlist **sg_pp, unsigned int *sg_off);
|
|
void cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *,
|
|
struct cxgbi_tag_format *, unsigned int ppmax,
|
|
unsigned int llimit, unsigned int start,
|
|
unsigned int rsvd_factor);
|
|
#endif /*__LIBCXGBI_H__*/
|