*/
#include <linux/types.h>
-#include <linux/list.h>
#include <linux/inet.h>
+#include <linux/file.h>
#include <linux/blkdev.h>
#include <linux/crypto.h>
#include <linux/delay.h>
#include <linux/kfifo.h>
#include <linux/scatterlist.h>
-#include <linux/mutex.h>
#include <net/tcp.h>
#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi.h>
#include <scsi/scsi_transport_iscsi.h>
#include "iscsi_tcp.h"
-MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, "
+MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
+ "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
"Alex Aizman <itn780@yahoo.com>");
MODULE_DESCRIPTION("iSCSI/TCP data-path");
MODULE_LICENSE("GPL");
-/* #define DEBUG_TCP */
-#define DEBUG_ASSERT
+#undef DEBUG_TCP
#ifdef DEBUG_TCP
#define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt)
#define debug_tcp(fmt...)
#endif
-#ifndef DEBUG_ASSERT
-#ifdef BUG_ON
-#undef BUG_ON
-#endif
-#define BUG_ON(expr)
-#endif
+static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport;
+static struct scsi_host_template iscsi_sw_tcp_sht;
+static struct iscsi_transport iscsi_sw_tcp_transport;
static unsigned int iscsi_max_lun = 512;
module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
-static inline void
-iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size)
-{
- ibuf->sg.page = virt_to_page(vbuf);
- ibuf->sg.offset = offset_in_page(vbuf);
- ibuf->sg.length = size;
- ibuf->sent = 0;
- ibuf->use_sendmsg = 1;
-}
-
-static inline void
-iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg)
-{
- ibuf->sg.page = sg->page;
- ibuf->sg.offset = sg->offset;
- ibuf->sg.length = sg->length;
- /*
- * Fastpath: sg element fits into single page
- */
- if (sg->length + sg->offset <= PAGE_SIZE && !PageSlab(sg->page))
- ibuf->use_sendmsg = 0;
- else
- ibuf->use_sendmsg = 1;
- ibuf->sent = 0;
-}
-
-static inline int
-iscsi_buf_left(struct iscsi_buf *ibuf)
-{
- int rc;
-
- rc = ibuf->sg.length - ibuf->sent;
- BUG_ON(rc < 0);
- return rc;
-}
-
-static inline void
-iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
- u8* crc)
-{
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
-
- crypto_hash_digest(&tcp_conn->tx_hash, &buf->sg, buf->sg.length, crc);
- buf->sg.length = tcp_conn->hdr_size;
-}
-
-static inline int
-iscsi_hdr_extract(struct iscsi_tcp_conn *tcp_conn)
-{
- struct sk_buff *skb = tcp_conn->in.skb;
-
- tcp_conn->in.zero_copy_hdr = 0;
-
- if (tcp_conn->in.copy >= tcp_conn->hdr_size &&
- tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) {
- /*
- * Zero-copy PDU Header: using connection context
- * to store header pointer.
- */
- if (skb_shinfo(skb)->frag_list == NULL &&
- !skb_shinfo(skb)->nr_frags) {
- tcp_conn->in.hdr = (struct iscsi_hdr *)
- ((char*)skb->data + tcp_conn->in.offset);
- tcp_conn->in.zero_copy_hdr = 1;
- } else {
- /* ignoring return code since we checked
- * in.copy before */
- skb_copy_bits(skb, tcp_conn->in.offset,
- &tcp_conn->hdr, tcp_conn->hdr_size);
- tcp_conn->in.hdr = &tcp_conn->hdr;
- }
- tcp_conn->in.offset += tcp_conn->hdr_size;
- tcp_conn->in.copy -= tcp_conn->hdr_size;
- } else {
- int hdr_remains;
- int copylen;
-
- /*
- * PDU header scattered across SKB's,
- * copying it... This'll happen quite rarely.
- */
-
- if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER)
- tcp_conn->in.hdr_offset = 0;
-
- hdr_remains = tcp_conn->hdr_size - tcp_conn->in.hdr_offset;
- BUG_ON(hdr_remains <= 0);
-
- copylen = min(tcp_conn->in.copy, hdr_remains);
- skb_copy_bits(skb, tcp_conn->in.offset,
- (char*)&tcp_conn->hdr + tcp_conn->in.hdr_offset,
- copylen);
-
- debug_tcp("PDU gather offset %d bytes %d in.offset %d "
- "in.copy %d\n", tcp_conn->in.hdr_offset, copylen,
- tcp_conn->in.offset, tcp_conn->in.copy);
-
- tcp_conn->in.offset += copylen;
- tcp_conn->in.copy -= copylen;
- if (copylen < hdr_remains) {
- tcp_conn->in_progress = IN_PROGRESS_HEADER_GATHER;
- tcp_conn->in.hdr_offset += copylen;
- return -EAGAIN;
- }
- tcp_conn->in.hdr = &tcp_conn->hdr;
- tcp_conn->discontiguous_hdr_cnt++;
- tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
- }
-
- return 0;
-}
-
-/*
- * must be called with session lock
- */
-static void
-iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- struct iscsi_r2t_info *r2t;
- struct scsi_cmnd *sc;
-
- /* flush ctask's r2t queues */
- while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
- __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
- sizeof(void*));
- debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n");
- }
-
- sc = ctask->sc;
- if (unlikely(!sc))
- return;
-
- tcp_ctask->xmstate = XMSTATE_IDLE;
- tcp_ctask->r2t = NULL;
-}
-
-/**
- * iscsi_data_rsp - SCSI Data-In Response processing
- * @conn: iscsi connection
- * @ctask: scsi command task
- **/
-static int
-iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- int rc;
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr;
- struct iscsi_session *session = conn->session;
- int datasn = be32_to_cpu(rhdr->datasn);
-
- rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
- if (rc)
- return rc;
- /*
- * setup Data-In byte counter (gets decremented..)
- */
- ctask->data_count = tcp_conn->in.datalen;
-
- if (tcp_conn->in.datalen == 0)
- return 0;
-
- if (ctask->datasn != datasn)
- return ISCSI_ERR_DATASN;
-
- ctask->datasn++;
-
- tcp_ctask->data_offset = be32_to_cpu(rhdr->offset);
- if (tcp_ctask->data_offset + tcp_conn->in.datalen > ctask->total_length)
- return ISCSI_ERR_DATA_OFFSET;
-
- if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
- struct scsi_cmnd *sc = ctask->sc;
-
- conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
- if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) {
- int res_count = be32_to_cpu(rhdr->residual_count);
-
- if (res_count > 0 &&
- res_count <= sc->request_bufflen) {
- sc->resid = res_count;
- sc->result = (DID_OK << 16) | rhdr->cmd_status;
- } else
- sc->result = (DID_BAD_TARGET << 16) |
- rhdr->cmd_status;
- } else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) {
- sc->resid = be32_to_cpu(rhdr->residual_count);
- sc->result = (DID_OK << 16) | rhdr->cmd_status;
- } else
- sc->result = (DID_OK << 16) | rhdr->cmd_status;
- }
-
- conn->datain_pdus_cnt++;
- return 0;
-}
-
-/**
- * iscsi_solicit_data_init - initialize first Data-Out
- * @conn: iscsi connection
- * @ctask: scsi command task
- * @r2t: R2T info
- *
- * Notes:
- * Initialize first Data-Out within this R2T sequence and finds
- * proper data_offset within this SCSI command.
- *
- * This function is called with connection lock taken.
- **/
-static void
-iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
- struct iscsi_r2t_info *r2t)
-{
- struct iscsi_data *hdr;
- struct scsi_cmnd *sc = ctask->sc;
-
- hdr = &r2t->dtask.hdr;
- memset(hdr, 0, sizeof(struct iscsi_data));
- hdr->ttt = r2t->ttt;
- hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
- r2t->solicit_datasn++;
- hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
- memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
- hdr->itt = ctask->hdr->itt;
- hdr->exp_statsn = r2t->exp_statsn;
- hdr->offset = cpu_to_be32(r2t->data_offset);
- if (r2t->data_length > conn->max_xmit_dlength) {
- hton24(hdr->dlength, conn->max_xmit_dlength);
- r2t->data_count = conn->max_xmit_dlength;
- hdr->flags = 0;
- } else {
- hton24(hdr->dlength, r2t->data_length);
- r2t->data_count = r2t->data_length;
- hdr->flags = ISCSI_FLAG_CMD_FINAL;
- }
- conn->dataout_pdus_cnt++;
-
- r2t->sent = 0;
-
- iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
- sizeof(struct iscsi_hdr));
-
- if (sc->use_sg) {
- int i, sg_count = 0;
- struct scatterlist *sg = sc->request_buffer;
-
- r2t->sg = NULL;
- for (i = 0; i < sc->use_sg; i++, sg += 1) {
- /* FIXME: prefetch ? */
- if (sg_count + sg->length > r2t->data_offset) {
- int page_offset;
-
- /* sg page found! */
-
- /* offset within this page */
- page_offset = r2t->data_offset - sg_count;
-
- /* fill in this buffer */
- iscsi_buf_init_sg(&r2t->sendbuf, sg);
- r2t->sendbuf.sg.offset += page_offset;
- r2t->sendbuf.sg.length -= page_offset;
-
- /* xmit logic will continue with next one */
- r2t->sg = sg + 1;
- break;
- }
- sg_count += sg->length;
- }
- BUG_ON(r2t->sg == NULL);
- } else {
- iscsi_buf_init_iov(&r2t->sendbuf,
- (char*)sc->request_buffer + r2t->data_offset,
- r2t->data_count);
- r2t->sg = NULL;
- }
-}
-
-/**
- * iscsi_r2t_rsp - iSCSI R2T Response processing
- * @conn: iscsi connection
- * @ctask: scsi command task
- **/
-static int
-iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- struct iscsi_r2t_info *r2t;
- struct iscsi_session *session = conn->session;
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr;
- int r2tsn = be32_to_cpu(rhdr->r2tsn);
- int rc;
-
- if (tcp_conn->in.datalen) {
- printk(KERN_ERR "iscsi_tcp: invalid R2t with datalen %d\n",
- tcp_conn->in.datalen);
- return ISCSI_ERR_DATALEN;
- }
-
- if (tcp_ctask->exp_r2tsn && tcp_ctask->exp_r2tsn != r2tsn)
- return ISCSI_ERR_R2TSN;
-
- rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
- if (rc)
- return rc;
-
- /* FIXME: use R2TSN to detect missing R2T */
-
- /* fill-in new R2T associated with the task */
- spin_lock(&session->lock);
- if (!ctask->sc || ctask->mtask ||
- session->state != ISCSI_STATE_LOGGED_IN) {
- printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in "
- "recovery...\n", ctask->itt);
- spin_unlock(&session->lock);
- return 0;
- }
-
- rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
- BUG_ON(!rc);
-
- r2t->exp_statsn = rhdr->statsn;
- r2t->data_length = be32_to_cpu(rhdr->data_length);
- if (r2t->data_length == 0) {
- printk(KERN_ERR "iscsi_tcp: invalid R2T with zero data len\n");
- spin_unlock(&session->lock);
- return ISCSI_ERR_DATALEN;
- }
-
- if (r2t->data_length > session->max_burst)
- debug_scsi("invalid R2T with data len %u and max burst %u."
- "Attempting to execute request.\n",
- r2t->data_length, session->max_burst);
-
- r2t->data_offset = be32_to_cpu(rhdr->data_offset);
- if (r2t->data_offset + r2t->data_length > ctask->total_length) {
- spin_unlock(&session->lock);
- printk(KERN_ERR "iscsi_tcp: invalid R2T with data len %u at "
- "offset %u and total length %d\n", r2t->data_length,
- r2t->data_offset, ctask->total_length);
- return ISCSI_ERR_DATALEN;
- }
-
- r2t->ttt = rhdr->ttt; /* no flip */
- r2t->solicit_datasn = 0;
-
- iscsi_solicit_data_init(conn, ctask, r2t);
-
- tcp_ctask->exp_r2tsn = r2tsn + 1;
- __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*));
- tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
- list_move_tail(&ctask->running, &conn->xmitqueue);
-
- scsi_queue_work(session->host, &conn->xmitwork);
- conn->r2t_pdus_cnt++;
- spin_unlock(&session->lock);
-
- return 0;
-}
-
-static int
-iscsi_tcp_hdr_recv(struct iscsi_conn *conn)
-{
- int rc = 0, opcode, ahslen;
- struct iscsi_hdr *hdr;
- struct iscsi_session *session = conn->session;
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- uint32_t cdgst, rdgst = 0, itt;
-
- hdr = tcp_conn->in.hdr;
-
- /* verify PDU length */
- tcp_conn->in.datalen = ntoh24(hdr->dlength);
- if (tcp_conn->in.datalen > conn->max_recv_dlength) {
- printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n",
- tcp_conn->in.datalen, conn->max_recv_dlength);
- return ISCSI_ERR_DATALEN;
- }
- tcp_conn->data_copied = 0;
-
- /* read AHS */
- ahslen = hdr->hlength << 2;
- tcp_conn->in.offset += ahslen;
- tcp_conn->in.copy -= ahslen;
- if (tcp_conn->in.copy < 0) {
- printk(KERN_ERR "iscsi_tcp: can't handle AHS with length "
- "%d bytes\n", ahslen);
- return ISCSI_ERR_AHSLEN;
- }
-
- /* calculate read padding */
- tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1);
- if (tcp_conn->in.padding) {
- tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding;
- debug_scsi("read padding %d bytes\n", tcp_conn->in.padding);
- }
-
- if (conn->hdrdgst_en) {
- struct scatterlist sg;
-
- sg_init_one(&sg, (u8 *)hdr,
- sizeof(struct iscsi_hdr) + ahslen);
- crypto_hash_digest(&tcp_conn->rx_hash, &sg, sg.length,
- (u8 *)&cdgst);
- rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
- ahslen);
- if (cdgst != rdgst) {
- printk(KERN_ERR "iscsi_tcp: hdrdgst error "
- "recv 0x%x calc 0x%x\n", rdgst, cdgst);
- return ISCSI_ERR_HDR_DGST;
- }
- }
-
- opcode = hdr->opcode & ISCSI_OPCODE_MASK;
- /* verify itt (itt encoding: age+cid+itt) */
- rc = iscsi_verify_itt(conn, hdr, &itt);
- if (rc == ISCSI_ERR_NO_SCSI_CMD) {
- tcp_conn->in.datalen = 0; /* force drop */
- return 0;
- } else if (rc)
- return rc;
-
- debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
- opcode, tcp_conn->in.offset, tcp_conn->in.copy,
- ahslen, tcp_conn->in.datalen);
-
- switch(opcode) {
- case ISCSI_OP_SCSI_DATA_IN:
- tcp_conn->in.ctask = session->cmds[itt];
- rc = iscsi_data_rsp(conn, tcp_conn->in.ctask);
- if (rc)
- return rc;
- /* fall through */
- case ISCSI_OP_SCSI_CMD_RSP:
- tcp_conn->in.ctask = session->cmds[itt];
- if (tcp_conn->in.datalen)
- goto copy_hdr;
-
- spin_lock(&session->lock);
- rc = __iscsi_complete_pdu(conn, hdr, NULL, 0);
- spin_unlock(&session->lock);
- break;
- case ISCSI_OP_R2T:
- tcp_conn->in.ctask = session->cmds[itt];
- if (ahslen)
- rc = ISCSI_ERR_AHSLEN;
- else if (tcp_conn->in.ctask->sc->sc_data_direction ==
- DMA_TO_DEVICE)
- rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask);
- else
- rc = ISCSI_ERR_PROTO;
- break;
- case ISCSI_OP_LOGIN_RSP:
- case ISCSI_OP_TEXT_RSP:
- case ISCSI_OP_REJECT:
- case ISCSI_OP_ASYNC_EVENT:
- /*
- * It is possible that we could get a PDU with a buffer larger
- * than 8K, but there are no targets that currently do this.
- * For now we fail until we find a vendor that needs it
- */
- if (ISCSI_DEF_MAX_RECV_SEG_LEN <
- tcp_conn->in.datalen) {
- printk(KERN_ERR "iscsi_tcp: received buffer of len %u "
- "but conn buffer is only %u (opcode %0x)\n",
- tcp_conn->in.datalen,
- ISCSI_DEF_MAX_RECV_SEG_LEN, opcode);
- rc = ISCSI_ERR_PROTO;
- break;
- }
-
- if (tcp_conn->in.datalen)
- goto copy_hdr;
- /* fall through */
- case ISCSI_OP_LOGOUT_RSP:
- case ISCSI_OP_NOOP_IN:
- case ISCSI_OP_SCSI_TMFUNC_RSP:
- rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
- break;
- default:
- rc = ISCSI_ERR_BAD_OPCODE;
- break;
- }
-
- return rc;
-
-copy_hdr:
- /*
- * if we did zero copy for the header but we will need multiple
- * skbs to complete the command then we have to copy the header
- * for later use
- */
- if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy <=
- (tcp_conn->in.datalen + tcp_conn->in.padding +
- (conn->datadgst_en ? 4 : 0))) {
- debug_tcp("Copying header for later use. in.copy %d in.datalen"
- " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen);
- memcpy(&tcp_conn->hdr, tcp_conn->in.hdr,
- sizeof(struct iscsi_hdr));
- tcp_conn->in.hdr = &tcp_conn->hdr;
- tcp_conn->in.zero_copy_hdr = 0;
- }
- return 0;
-}
-
-/**
- * iscsi_ctask_copy - copy skb bits to the destanation cmd task
- * @conn: iscsi tcp connection
- * @ctask: scsi command task
- * @buf: buffer to copy to
- * @buf_size: size of buffer
- * @offset: offset within the buffer
- *
- * Notes:
- * The function calls skb_copy_bits() and updates per-connection and
- * per-cmd byte counters.
- *
- * Read counters (in bytes):
- *
- * conn->in.offset offset within in progress SKB
- * conn->in.copy left to copy from in progress SKB
- * including padding
- * conn->in.copied copied already from in progress SKB
- * conn->data_copied copied already from in progress buffer
- * ctask->sent total bytes sent up to the MidLayer
- * ctask->data_count left to copy from in progress Data-In
- * buf_left left to copy from in progress buffer
- **/
-static inline int
-iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask,
- void *buf, int buf_size, int offset)
-{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- int buf_left = buf_size - (tcp_conn->data_copied + offset);
- int size = min(tcp_conn->in.copy, buf_left);
- int rc;
-
- size = min(size, ctask->data_count);
-
- debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
- size, tcp_conn->in.offset, tcp_conn->in.copied);
-
- BUG_ON(size <= 0);
- BUG_ON(tcp_ctask->sent + size > ctask->total_length);
-
- rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
- (char*)buf + (offset + tcp_conn->data_copied), size);
- /* must fit into skb->len */
- BUG_ON(rc);
-
- tcp_conn->in.offset += size;
- tcp_conn->in.copy -= size;
- tcp_conn->in.copied += size;
- tcp_conn->data_copied += size;
- tcp_ctask->sent += size;
- ctask->data_count -= size;
-
- BUG_ON(tcp_conn->in.copy < 0);
- BUG_ON(ctask->data_count < 0);
-
- if (buf_size != (tcp_conn->data_copied + offset)) {
- if (!ctask->data_count) {
- BUG_ON(buf_size - tcp_conn->data_copied < 0);
- /* done with this PDU */
- return buf_size - tcp_conn->data_copied;
- }
- return -EAGAIN;
- }
-
- /* done with this buffer or with both - PDU and buffer */
- tcp_conn->data_copied = 0;
- return 0;
-}
-
/**
- * iscsi_tcp_copy - copy skb bits to the destanation buffer
- * @conn: iscsi tcp connection
- *
- * Notes:
- * The function calls skb_copy_bits() and updates per-connection
- * byte counters.
- **/
-static inline int
-iscsi_tcp_copy(struct iscsi_conn *conn, int buf_size)
-{
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- int buf_left = buf_size - tcp_conn->data_copied;
- int size = min(tcp_conn->in.copy, buf_left);
- int rc;
-
- debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
- size, tcp_conn->in.offset, tcp_conn->data_copied);
- BUG_ON(size <= 0);
-
- rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
- (char*)conn->data + tcp_conn->data_copied, size);
- BUG_ON(rc);
-
- tcp_conn->in.offset += size;
- tcp_conn->in.copy -= size;
- tcp_conn->in.copied += size;
- tcp_conn->data_copied += size;
-
- if (buf_size != tcp_conn->data_copied)
- return -EAGAIN;
-
- return 0;
-}
-
-static inline void
-partial_sg_digest_update(struct hash_desc *desc, struct scatterlist *sg,
- int offset, int length)
-{
- struct scatterlist temp;
-
- memcpy(&temp, sg, sizeof(struct scatterlist));
- temp.offset = offset;
- temp.length = length;
- crypto_hash_update(desc, &temp, length);
-}
-
-static void
-iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len)
-{
- struct scatterlist tmp;
-
- sg_init_one(&tmp, buf, len);
- crypto_hash_update(&tcp_conn->rx_hash, &tmp, len);
-}
-
-static int iscsi_scsi_data_in(struct iscsi_conn *conn)
-{
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct iscsi_cmd_task *ctask = tcp_conn->in.ctask;
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- struct scsi_cmnd *sc = ctask->sc;
- struct scatterlist *sg;
- int i, offset, rc = 0;
-
- BUG_ON((void*)ctask != sc->SCp.ptr);
-
- /*
- * copying Data-In into the Scsi_Cmnd
- */
- if (!sc->use_sg) {
- i = ctask->data_count;
- rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer,
- sc->request_bufflen,
- tcp_ctask->data_offset);
- if (rc == -EAGAIN)
- return rc;
- if (conn->datadgst_en)
- iscsi_recv_digest_update(tcp_conn, sc->request_buffer,
- i);
- rc = 0;
- goto done;
- }
-
- offset = tcp_ctask->data_offset;
- sg = sc->request_buffer;
-
- if (tcp_ctask->data_offset)
- for (i = 0; i < tcp_ctask->sg_count; i++)
- offset -= sg[i].length;
- /* we've passed through partial sg*/
- if (offset < 0)
- offset = 0;
-
- for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) {
- char *dest;
-
- dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
- rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset,
- sg[i].length, offset);
- kunmap_atomic(dest, KM_SOFTIRQ0);
- if (rc == -EAGAIN)
- /* continue with the next SKB/PDU */
- return rc;
- if (!rc) {
- if (conn->datadgst_en) {
- if (!offset)
- crypto_hash_update(
- &tcp_conn->rx_hash,
- &sg[i], sg[i].length);
- else
- partial_sg_digest_update(
- &tcp_conn->rx_hash,
- &sg[i],
- sg[i].offset + offset,
- sg[i].length - offset);
- }
- offset = 0;
- tcp_ctask->sg_count++;
- }
-
- if (!ctask->data_count) {
- if (rc && conn->datadgst_en)
- /*
- * data-in is complete, but buffer not...
- */
- partial_sg_digest_update(&tcp_conn->rx_hash,
- &sg[i],
- sg[i].offset,
- sg[i].length-rc);
- rc = 0;
- break;
- }
-
- if (!tcp_conn->in.copy)
- return -EAGAIN;
- }
- BUG_ON(ctask->data_count);
-
-done:
- /* check for non-exceptional status */
- if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) {
- debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n",
- (long)sc, sc->result, ctask->itt,
- tcp_conn->in.hdr->flags);
- spin_lock(&conn->session->lock);
- __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0);
- spin_unlock(&conn->session->lock);
- }
-
- return rc;
-}
-
-static int
-iscsi_data_recv(struct iscsi_conn *conn)
-{
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- int rc = 0, opcode;
-
- opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
- switch (opcode) {
- case ISCSI_OP_SCSI_DATA_IN:
- rc = iscsi_scsi_data_in(conn);
- break;
- case ISCSI_OP_SCSI_CMD_RSP:
- case ISCSI_OP_TEXT_RSP:
- case ISCSI_OP_LOGIN_RSP:
- case ISCSI_OP_ASYNC_EVENT:
- case ISCSI_OP_REJECT:
- /*
- * Collect data segment to the connection's data
- * placeholder
- */
- if (iscsi_tcp_copy(conn, tcp_conn->in.datalen)) {
- rc = -EAGAIN;
- goto exit;
- }
-
- rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, conn->data,
- tcp_conn->in.datalen);
- if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP)
- iscsi_recv_digest_update(tcp_conn, conn->data,
- tcp_conn->in.datalen);
- break;
- default:
- BUG_ON(1);
- }
-exit:
- return rc;
-}
-
-/**
- * iscsi_tcp_data_recv - TCP receive in sendfile fashion
+ * iscsi_sw_tcp_recv - TCP receive in sendfile fashion
* @rd_desc: read descriptor
* @skb: socket buffer
* @offset: offset in skb
* @len: skb->len - offset
- **/
-static int
-iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
- unsigned int offset, size_t len)
+ */
+static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
+ unsigned int offset, size_t len)
{
- int rc;
struct iscsi_conn *conn = rd_desc->arg.data;
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- int processed;
- char pad[ISCSI_PAD_LEN];
- struct scatterlist sg;
-
- /*
- * Save current SKB and its offset in the corresponding
- * connection context.
- */
- tcp_conn->in.copy = skb->len - offset;
- tcp_conn->in.offset = offset;
- tcp_conn->in.skb = skb;
- tcp_conn->in.len = tcp_conn->in.copy;
- BUG_ON(tcp_conn->in.copy <= 0);
- debug_tcp("in %d bytes\n", tcp_conn->in.copy);
-
-more:
- tcp_conn->in.copied = 0;
- rc = 0;
-
- if (unlikely(conn->suspend_rx)) {
- debug_tcp("conn %d Rx suspended!\n", conn->id);
- return 0;
- }
+ unsigned int consumed, total_consumed = 0;
+ int status;
- if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
- tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
- rc = iscsi_hdr_extract(tcp_conn);
- if (rc) {
- if (rc == -EAGAIN)
- goto nomore;
- else {
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- return 0;
- }
- }
-
- /*
- * Verify and process incoming PDU header.
- */
- rc = iscsi_tcp_hdr_recv(conn);
- if (!rc && tcp_conn->in.datalen) {
- if (conn->datadgst_en)
- crypto_hash_init(&tcp_conn->rx_hash);
- tcp_conn->in_progress = IN_PROGRESS_DATA_RECV;
- } else if (rc) {
- iscsi_conn_failure(conn, rc);
- return 0;
- }
- }
+ debug_tcp("in %d bytes\n", skb->len - offset);
- if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) {
- uint32_t recv_digest;
-
- debug_tcp("extra data_recv offset %d copy %d\n",
- tcp_conn->in.offset, tcp_conn->in.copy);
- rc = iscsi_tcp_copy(conn, sizeof(uint32_t));
- if (rc) {
- if (rc == -EAGAIN)
- goto again;
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- return 0;
- }
+ do {
+ status = 0;
+ consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status);
+ offset += consumed;
+ total_consumed += consumed;
+ } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE);
- memcpy(&recv_digest, conn->data, sizeof(uint32_t));
- if (recv_digest != tcp_conn->in.datadgst) {
- debug_tcp("iscsi_tcp: data digest error!"
- "0x%x != 0x%x\n", recv_digest,
- tcp_conn->in.datadgst);
- iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
- return 0;
- } else {
- debug_tcp("iscsi_tcp: data digest match!"
- "0x%x == 0x%x\n", recv_digest,
- tcp_conn->in.datadgst);
- tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
- }
- }
-
- if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV &&
- tcp_conn->in.copy) {
-
- debug_tcp("data_recv offset %d copy %d\n",
- tcp_conn->in.offset, tcp_conn->in.copy);
-
- rc = iscsi_data_recv(conn);
- if (rc) {
- if (rc == -EAGAIN)
- goto again;
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- return 0;
- }
- tcp_conn->in.copy -= tcp_conn->in.padding;
- tcp_conn->in.offset += tcp_conn->in.padding;
- if (conn->datadgst_en) {
- if (tcp_conn->in.padding) {
- debug_tcp("padding -> %d\n",
- tcp_conn->in.padding);
- memset(pad, 0, tcp_conn->in.padding);
- sg_init_one(&sg, pad, tcp_conn->in.padding);
- crypto_hash_update(&tcp_conn->rx_hash,
- &sg, sg.length);
- }
- crypto_hash_final(&tcp_conn->rx_hash,
- (u8 *) &tcp_conn->in.datadgst);
- debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst);
- tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
- tcp_conn->data_copied = 0;
- } else
- tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
- }
-
- debug_tcp("f, processed %d from out of %d padding %d\n",
- tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding);
- BUG_ON(tcp_conn->in.offset - offset > len);
-
- if (tcp_conn->in.offset - offset != len) {
- debug_tcp("continue to process %d bytes\n",
- (int)len - (tcp_conn->in.offset - offset));
- goto more;
- }
-
-nomore:
- processed = tcp_conn->in.offset - offset;
- BUG_ON(processed == 0);
- return processed;
-
-again:
- processed = tcp_conn->in.offset - offset;
- debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
- processed, (int)len, (int)rd_desc->count);
- BUG_ON(processed == 0);
- BUG_ON(processed > len);
-
- conn->rxdata_octets += processed;
- return processed;
+ debug_tcp("read %d bytes status %d\n", skb->len - offset, status);
+ return total_consumed;
}
-static void
-iscsi_tcp_data_ready(struct sock *sk, int flag)
+static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag)
{
struct iscsi_conn *conn = sk->sk_user_data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
read_descriptor_t rd_desc;
read_lock(&sk->sk_callback_lock);
/*
- * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv.
+ * Use rd_desc to pass 'conn' to iscsi_tcp_recv.
* We set count to 1 because we want the network layer to
- * hand us all the skbs that are available. iscsi_tcp_data_recv
+ * hand us all the skbs that are available. iscsi_tcp_recv
* handled pdus that cross buffers or pdus that still need data.
*/
rd_desc.arg.data = conn;
rd_desc.count = 1;
- tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
+ tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv);
read_unlock(&sk->sk_callback_lock);
+
+ /* If we had to (atomically) map a highmem page,
+ * unmap it now. */
+ iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
}
-static void
-iscsi_tcp_state_change(struct sock *sk)
+static void iscsi_sw_tcp_state_change(struct sock *sk)
{
struct iscsi_tcp_conn *tcp_conn;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn;
struct iscsi_conn *conn;
struct iscsi_session *session;
void (*old_state_change)(struct sock *);
}
tcp_conn = conn->dd_data;
- old_state_change = tcp_conn->old_state_change;
+ tcp_sw_conn = tcp_conn->dd_data;
+ old_state_change = tcp_sw_conn->old_state_change;
read_unlock(&sk->sk_callback_lock);
* iscsi_write_space - Called when more output buffer space is available
* @sk: socket space is available for
**/
-static void
-iscsi_write_space(struct sock *sk)
+static void iscsi_sw_tcp_write_space(struct sock *sk)
{
struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
- tcp_conn->old_write_space(sk);
+ tcp_sw_conn->old_write_space(sk);
debug_tcp("iscsi_write_space: cid %d\n", conn->id);
scsi_queue_work(conn->session->host, &conn->xmitwork);
}
-static void
-iscsi_conn_set_callbacks(struct iscsi_conn *conn)
+static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct sock *sk = tcp_conn->sock->sk;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct sock *sk = tcp_sw_conn->sock->sk;
/* assign new callbacks */
write_lock_bh(&sk->sk_callback_lock);
sk->sk_user_data = conn;
- tcp_conn->old_data_ready = sk->sk_data_ready;
- tcp_conn->old_state_change = sk->sk_state_change;
- tcp_conn->old_write_space = sk->sk_write_space;
- sk->sk_data_ready = iscsi_tcp_data_ready;
- sk->sk_state_change = iscsi_tcp_state_change;
- sk->sk_write_space = iscsi_write_space;
+ tcp_sw_conn->old_data_ready = sk->sk_data_ready;
+ tcp_sw_conn->old_state_change = sk->sk_state_change;
+ tcp_sw_conn->old_write_space = sk->sk_write_space;
+ sk->sk_data_ready = iscsi_sw_tcp_data_ready;
+ sk->sk_state_change = iscsi_sw_tcp_state_change;
+ sk->sk_write_space = iscsi_sw_tcp_write_space;
write_unlock_bh(&sk->sk_callback_lock);
}
static void
-iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn)
+iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_sw_tcp_conn *tcp_sw_conn)
{
- struct sock *sk = tcp_conn->sock->sk;
+ struct sock *sk = tcp_sw_conn->sock->sk;
/* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
write_lock_bh(&sk->sk_callback_lock);
sk->sk_user_data = NULL;
- sk->sk_data_ready = tcp_conn->old_data_ready;
- sk->sk_state_change = tcp_conn->old_state_change;
- sk->sk_write_space = tcp_conn->old_write_space;
+ sk->sk_data_ready = tcp_sw_conn->old_data_ready;
+ sk->sk_state_change = tcp_sw_conn->old_state_change;
+ sk->sk_write_space = tcp_sw_conn->old_write_space;
sk->sk_no_check = 0;
write_unlock_bh(&sk->sk_callback_lock);
}
/**
- * iscsi_send - generic send routine
- * @sk: kernel's socket
- * @buf: buffer to write from
- * @size: actual size to write
- * @flags: socket's flags
+ * iscsi_sw_tcp_xmit_segment - transmit segment
+ * @tcp_sw_conn: the iSCSI TCP connection
+ * @segment: the buffer to transmnit
+ *
+ * This function transmits as much of the buffer as
+ * the network layer will accept, and returns the number of
+ * bytes transmitted.
+ *
+ * If CRC hashing is enabled, the function will compute the
+ * hash as it goes. When the entire segment has been transmitted,
+ * it will retrieve the hash value and send it as well.
*/
-static inline int
-iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags)
-{
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct socket *sk = tcp_conn->sock;
- int offset = buf->sg.offset + buf->sent, res;
-
- /*
- * if we got use_sg=0 or are sending something we kmallocd
- * then we did not have to do kmap (kmap returns page_address)
- *
- * if we got use_sg > 0, but had to drop down, we do not
- * set clustering so this should only happen for that
- * slab case.
- */
- if (buf->use_sendmsg)
- res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags);
- else
- res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags);
-
- if (res >= 0) {
- conn->txdata_octets += res;
- buf->sent += res;
- return res;
- }
+static int iscsi_sw_tcp_xmit_segment(struct iscsi_sw_tcp_conn *tcp_sw_conn,
+ struct iscsi_segment *segment)
+{
+ struct socket *sk = tcp_sw_conn->sock;
+ unsigned int copied = 0;
+ int r = 0;
+
+ while (!iscsi_tcp_segment_done(segment, 0, r)) {
+ struct scatterlist *sg;
+ unsigned int offset, copy;
+ int flags = 0;
+
+ r = 0;
+ offset = segment->copied;
+ copy = segment->size - offset;
+
+ if (segment->total_copied + segment->size < segment->total_size)
+ flags |= MSG_MORE;
+
+ /* Use sendpage if we can; else fall back to sendmsg */
+ if (!segment->data) {
+ sg = segment->sg;
+ offset += segment->sg_offset + sg->offset;
+ r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset,
+ copy, flags);
+ } else {
+ struct msghdr msg = { .msg_flags = flags };
+ struct kvec iov = {
+ .iov_base = segment->data + offset,
+ .iov_len = copy
+ };
- tcp_conn->sendpage_failures_cnt++;
- if (res == -EAGAIN)
- res = -ENOBUFS;
- else
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- return res;
-}
+ r = kernel_sendmsg(sk, &msg, &iov, 1, copy);
+ }
-/**
- * iscsi_sendhdr - send PDU Header via tcp_sendpage()
- * @conn: iscsi connection
- * @buf: buffer to write from
- * @datalen: lenght of data to be sent after the header
- *
- * Notes:
- * (Tx, Fast Path)
- **/
-static inline int
-iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen)
-{
- int flags = 0; /* MSG_DONTWAIT; */
- int res, size;
-
- size = buf->sg.length - buf->sent;
- BUG_ON(buf->sent + size > buf->sg.length);
- if (buf->sent + size != buf->sg.length || datalen)
- flags |= MSG_MORE;
-
- res = iscsi_send(conn, buf, size, flags);
- debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res);
- if (res >= 0) {
- if (size != res)
- return -EAGAIN;
- return 0;
+ if (r < 0) {
+ iscsi_tcp_segment_unmap(segment);
+ if (copied || r == -EAGAIN)
+ break;
+ return r;
+ }
+ copied += r;
}
-
- return res;
+ return copied;
}
/**
- * iscsi_sendpage - send one page of iSCSI Data-Out.
- * @conn: iscsi connection
- * @buf: buffer to write from
- * @count: remaining data
- * @sent: number of bytes sent
- *
- * Notes:
- * (Tx, Fast Path)
+ * iscsi_sw_tcp_xmit - TCP transmit
**/
-static inline int
-iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf,
- int *count, int *sent)
+static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn)
{
- int flags = 0; /* MSG_DONTWAIT; */
- int res, size;
-
- size = buf->sg.length - buf->sent;
- BUG_ON(buf->sent + size > buf->sg.length);
- if (size > *count)
- size = *count;
- if (buf->sent + size != buf->sg.length || *count != size)
- flags |= MSG_MORE;
-
- res = iscsi_send(conn, buf, size, flags);
- debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
- size, buf->sent, *count, *sent, res);
- if (res >= 0) {
- *count -= res;
- *sent += res;
- if (size != res)
- return -EAGAIN;
- return 0;
- }
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
+ unsigned int consumed = 0;
+ int rc = 0;
- return res;
-}
+ while (1) {
+ rc = iscsi_sw_tcp_xmit_segment(tcp_sw_conn, segment);
+ if (rc < 0) {
+ rc = ISCSI_ERR_XMIT_FAILED;
+ goto error;
+ }
+ if (rc == 0)
+ break;
-static inline void
-iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_tcp_cmd_task *tcp_ctask)
-{
- crypto_hash_init(&tcp_conn->tx_hash);
- tcp_ctask->digest_count = 4;
-}
+ consumed += rc;
-/**
- * iscsi_solicit_data_cont - initialize next Data-Out
- * @conn: iscsi connection
- * @ctask: scsi command task
- * @r2t: R2T info
- * @left: bytes left to transfer
- *
- * Notes:
- * Initialize next Data-Out within this R2T sequence and continue
- * to process next Scatter-Gather element(if any) of this SCSI command.
- *
- * Called under connection lock.
- **/
-static void
-iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
- struct iscsi_r2t_info *r2t, int left)
-{
- struct iscsi_data *hdr;
- struct scsi_cmnd *sc = ctask->sc;
- int new_offset;
-
- hdr = &r2t->dtask.hdr;
- memset(hdr, 0, sizeof(struct iscsi_data));
- hdr->ttt = r2t->ttt;
- hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
- r2t->solicit_datasn++;
- hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
- memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
- hdr->itt = ctask->hdr->itt;
- hdr->exp_statsn = r2t->exp_statsn;
- new_offset = r2t->data_offset + r2t->sent;
- hdr->offset = cpu_to_be32(new_offset);
- if (left > conn->max_xmit_dlength) {
- hton24(hdr->dlength, conn->max_xmit_dlength);
- r2t->data_count = conn->max_xmit_dlength;
- } else {
- hton24(hdr->dlength, left);
- r2t->data_count = left;
- hdr->flags = ISCSI_FLAG_CMD_FINAL;
+ if (segment->total_copied >= segment->total_size) {
+ if (segment->done != NULL) {
+ rc = segment->done(tcp_conn, segment);
+ if (rc != 0)
+ goto error;
+ }
+ }
}
- conn->dataout_pdus_cnt++;
-
- iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
- sizeof(struct iscsi_hdr));
- if (iscsi_buf_left(&r2t->sendbuf))
- return;
-
- if (sc->use_sg) {
- iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
- r2t->sg += 1;
- } else {
- iscsi_buf_init_iov(&r2t->sendbuf,
- (char*)sc->request_buffer + new_offset,
- r2t->data_count);
- r2t->sg = NULL;
- }
-}
+ debug_tcp("xmit %d bytes\n", consumed);
-static void iscsi_set_padding(struct iscsi_tcp_cmd_task *tcp_ctask,
- unsigned long len)
-{
- tcp_ctask->pad_count = len & (ISCSI_PAD_LEN - 1);
- if (!tcp_ctask->pad_count)
- return;
+ conn->txdata_octets += consumed;
+ return consumed;
- tcp_ctask->pad_count = ISCSI_PAD_LEN - tcp_ctask->pad_count;
- debug_scsi("write padding %d bytes\n", tcp_ctask->pad_count);
- tcp_ctask->xmstate |= XMSTATE_W_PAD;
+error:
+ /* Transmit error. We could initiate error recovery
+ * here. */
+ debug_tcp("Error sending PDU, errno=%d\n", rc);
+ iscsi_conn_failure(conn, rc);
+ return -EIO;
}
/**
- * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
- * @conn: iscsi connection
- * @ctask: scsi command task
- * @sc: scsi command
- **/
-static void
-iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask)
+ * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit
+ */
+static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn)
{
- struct scsi_cmnd *sc = ctask->sc;
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
-
- BUG_ON(__kfifo_len(tcp_ctask->r2tqueue));
-
- tcp_ctask->sent = 0;
- tcp_ctask->sg_count = 0;
-
- if (sc->sc_data_direction == DMA_TO_DEVICE) {
- tcp_ctask->xmstate = XMSTATE_W_HDR;
- tcp_ctask->exp_r2tsn = 0;
- BUG_ON(ctask->total_length == 0);
-
- if (sc->use_sg) {
- struct scatterlist *sg = sc->request_buffer;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
- iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg);
- tcp_ctask->sg = sg + 1;
- tcp_ctask->bad_sg = sg + sc->use_sg;
- } else {
- iscsi_buf_init_iov(&tcp_ctask->sendbuf,
- sc->request_buffer,
- sc->request_bufflen);
- tcp_ctask->sg = NULL;
- tcp_ctask->bad_sg = NULL;
- }
- debug_scsi("cmd [itt 0x%x total %d imm_data %d "
- "unsol count %d, unsol offset %d]\n",
- ctask->itt, ctask->total_length, ctask->imm_count,
- ctask->unsol_count, ctask->unsol_offset);
- } else
- tcp_ctask->xmstate = XMSTATE_R_HDR;
-
- iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr,
- sizeof(struct iscsi_hdr));
+ return segment->total_copied - segment->total_size;
}
-/**
- * iscsi_tcp_mtask_xmit - xmit management(immediate) task
- * @conn: iscsi connection
- * @mtask: task management task
- *
- * Notes:
- * The function can return -EAGAIN in which case caller must
- * call it again later, or recover. '0' return code means successful
- * xmit.
- *
- * Management xmit state machine consists of two states:
- * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress
- * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress
- **/
-static int
-iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
+static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task)
{
- struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
+ struct iscsi_conn *conn = task->conn;
int rc;
- debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
- conn->id, tcp_mtask->xmstate, mtask->itt);
-
- if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) {
- tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR;
- if (mtask->data_count)
- tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
- if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
- conn->stop_stage != STOP_CONN_RECOVER &&
- conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &tcp_mtask->headbuf,
- (u8*)tcp_mtask->hdrext);
- rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf,
- mtask->data_count);
- if (rc) {
- tcp_mtask->xmstate |= XMSTATE_IMM_HDR;
- if (mtask->data_count)
- tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
+ while (iscsi_sw_tcp_xmit_qlen(conn)) {
+ rc = iscsi_sw_tcp_xmit(conn);
+ if (rc == 0)
+ return -EAGAIN;
+ if (rc < 0)
return rc;
- }
- }
-
- if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) {
- BUG_ON(!mtask->data_count);
- tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
- /* FIXME: implement.
- * Virtual buffer could be spreaded across multiple pages...
- */
- do {
- int rc;
-
- rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf,
- &mtask->data_count, &tcp_mtask->sent);
- if (rc) {
- tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
- return rc;
- }
- } while (mtask->data_count);
}
- BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE);
- if (mtask->hdr->itt == RESERVED_ITT) {
- struct iscsi_session *session = conn->session;
-
- spin_lock_bh(&session->lock);
- list_del(&conn->mtask->running);
- __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask,
- sizeof(void*));
- spin_unlock_bh(&session->lock);
- }
return 0;
}
-static inline int
-iscsi_send_read_hdr(struct iscsi_conn *conn,
- struct iscsi_tcp_cmd_task *tcp_ctask)
-{
- int rc;
-
- tcp_ctask->xmstate &= ~XMSTATE_R_HDR;
- if (conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
- (u8*)tcp_ctask->hdrext);
- rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, 0);
- if (!rc) {
- BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE);
- return 0; /* wait for Data-In */
- }
- tcp_ctask->xmstate |= XMSTATE_R_HDR;
- return rc;
-}
-
-static inline int
-iscsi_send_write_hdr(struct iscsi_conn *conn,
- struct iscsi_cmd_task *ctask)
+/*
+ * This is called when we're done sending the header.
+ * Simply copy the data_segment to the send segment, and return.
+ */
+static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
+ struct iscsi_segment *segment)
{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- int rc;
-
- tcp_ctask->xmstate &= ~XMSTATE_W_HDR;
- if (conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
- (u8*)tcp_ctask->hdrext);
- rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count);
- if (rc) {
- tcp_ctask->xmstate |= XMSTATE_W_HDR;
- return rc;
- }
-
- if (ctask->imm_count) {
- tcp_ctask->xmstate |= XMSTATE_IMM_DATA;
- iscsi_set_padding(tcp_ctask, ctask->imm_count);
-
- if (ctask->conn->datadgst_en) {
- iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask);
- tcp_ctask->immdigest = 0;
- }
- }
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
- if (ctask->unsol_count)
- tcp_ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT;
+ tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment;
+ debug_tcp("Header done. Next segment size %u total_size %u\n",
+ tcp_sw_conn->out.segment.size,
+ tcp_sw_conn->out.segment.total_size);
return 0;
}
-static int
-iscsi_send_padding(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr,
+ size_t hdrlen)
{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- int sent = 0, rc;
-
- if (tcp_ctask->xmstate & XMSTATE_W_PAD) {
- iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad,
- tcp_ctask->pad_count);
- if (conn->datadgst_en)
- crypto_hash_update(&tcp_conn->tx_hash,
- &tcp_ctask->sendbuf.sg,
- tcp_ctask->sendbuf.sg.length);
- } else if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_PAD))
- return 0;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
- tcp_ctask->xmstate &= ~XMSTATE_W_PAD;
- tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_PAD;
- debug_scsi("sending %d pad bytes for itt 0x%x\n",
- tcp_ctask->pad_count, ctask->itt);
- rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count,
- &sent);
- if (rc) {
- debug_scsi("padding send failed %d\n", rc);
- tcp_ctask->xmstate |= XMSTATE_W_RESEND_PAD;
- }
- return rc;
-}
+ debug_tcp("%s(%p%s)\n", __func__, tcp_conn,
+ conn->hdrdgst_en? ", digest enabled" : "");
-static int
-iscsi_send_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
- struct iscsi_buf *buf, uint32_t *digest)
-{
- struct iscsi_tcp_cmd_task *tcp_ctask;
- struct iscsi_tcp_conn *tcp_conn;
- int rc, sent = 0;
+ /* Clear the data segment - needs to be filled in by the
+ * caller using iscsi_tcp_send_data_prep() */
+ memset(&tcp_sw_conn->out.data_segment, 0,
+ sizeof(struct iscsi_segment));
- if (!conn->datadgst_en)
- return 0;
-
- tcp_ctask = ctask->dd_data;
- tcp_conn = conn->dd_data;
-
- if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_DATA_DIGEST)) {
- crypto_hash_final(&tcp_conn->tx_hash, (u8*)digest);
- iscsi_buf_init_iov(buf, (char*)digest, 4);
+ /* If header digest is enabled, compute the CRC and
+ * place the digest into the same buffer. We make
+ * sure that both iscsi_tcp_task and mtask have
+ * sufficient room.
+ */
+ if (conn->hdrdgst_en) {
+ iscsi_tcp_dgst_header(&tcp_sw_conn->tx_hash, hdr, hdrlen,
+ hdr + hdrlen);
+ hdrlen += ISCSI_DIGEST_SIZE;
}
- tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_DATA_DIGEST;
- rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent);
- if (!rc)
- debug_scsi("sent digest 0x%x for itt 0x%x\n", *digest,
- ctask->itt);
- else {
- debug_scsi("sending digest 0x%x failed for itt 0x%x!\n",
- *digest, ctask->itt);
- tcp_ctask->xmstate |= XMSTATE_W_RESEND_DATA_DIGEST;
- }
- return rc;
+ /* Remember header pointer for later, when we need
+ * to decide whether there's a payload to go along
+ * with the header. */
+ tcp_sw_conn->out.hdr = hdr;
+
+ iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen,
+ iscsi_sw_tcp_send_hdr_done, NULL);
}
+/*
+ * Prepare the send buffer for the payload data.
+ * Padding and checksumming will all be taken care
+ * of by the iscsi_segment routines.
+ */
static int
-iscsi_send_data(struct iscsi_cmd_task *ctask, struct iscsi_buf *sendbuf,
- struct scatterlist **sg, int *sent, int *count,
- struct iscsi_buf *digestbuf, uint32_t *digest)
+iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg,
+ unsigned int count, unsigned int offset,
+ unsigned int len)
{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- struct iscsi_conn *conn = ctask->conn;
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- int rc, buf_sent, offset;
-
- while (*count) {
- buf_sent = 0;
- offset = sendbuf->sent;
-
- rc = iscsi_sendpage(conn, sendbuf, count, &buf_sent);
- *sent = *sent + buf_sent;
- if (buf_sent && conn->datadgst_en)
- partial_sg_digest_update(&tcp_conn->tx_hash,
- &sendbuf->sg, sendbuf->sg.offset + offset,
- buf_sent);
- if (!iscsi_buf_left(sendbuf) && *sg != tcp_ctask->bad_sg) {
- iscsi_buf_init_sg(sendbuf, *sg);
- *sg = *sg + 1;
- }
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct hash_desc *tx_hash = NULL;
+ unsigned int hdr_spec_len;
- if (rc)
- return rc;
- }
+ debug_tcp("%s(%p, offset=%d, datalen=%d%s)\n", __func__,
+ tcp_conn, offset, len,
+ conn->datadgst_en? ", digest enabled" : "");
+
+ /* Make sure the datalen matches what the caller
+ said he would send. */
+ hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
+ WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
- rc = iscsi_send_padding(conn, ctask);
- if (rc)
- return rc;
+ if (conn->datadgst_en)
+ tx_hash = &tcp_sw_conn->tx_hash;
- return iscsi_send_digest(conn, ctask, digestbuf, digest);
+ return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,
+ sg, count, offset, len,
+ NULL, tx_hash);
}
-static int
-iscsi_send_unsol_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+static void
+iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data,
+ size_t len)
{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- struct iscsi_data_task *dtask;
- int rc;
-
- tcp_ctask->xmstate |= XMSTATE_UNS_DATA;
- if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) {
- dtask = &tcp_ctask->unsol_dtask;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct hash_desc *tx_hash = NULL;
+ unsigned int hdr_spec_len;
- iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr);
- iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr,
- sizeof(struct iscsi_hdr));
- if (conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
- (u8*)dtask->hdrext);
+ debug_tcp("%s(%p, datalen=%d%s)\n", __func__, tcp_conn, len,
+ conn->datadgst_en? ", digest enabled" : "");
- tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT;
- iscsi_set_padding(tcp_ctask, ctask->data_count);
- }
+ /* Make sure the datalen matches what the caller
+ said he would send. */
+ hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
+ WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
- rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count);
- if (rc) {
- tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
- tcp_ctask->xmstate |= XMSTATE_UNS_HDR;
- return rc;
- }
+ if (conn->datadgst_en)
+ tx_hash = &tcp_sw_conn->tx_hash;
- if (conn->datadgst_en) {
- dtask = &tcp_ctask->unsol_dtask;
- iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask);
- dtask->digest = 0;
- }
-
- debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
- ctask->itt, ctask->unsol_count, tcp_ctask->sent);
- return 0;
+ iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,
+ data, len, NULL, tx_hash);
}
-static int
-iscsi_send_unsol_pdu(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
+ unsigned int offset, unsigned int count)
{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- int rc;
-
- if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) {
- BUG_ON(!ctask->unsol_count);
- tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR;
-send_hdr:
- rc = iscsi_send_unsol_hdr(conn, ctask);
- if (rc)
- return rc;
- }
+ struct iscsi_conn *conn = task->conn;
+ int err = 0;
- if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) {
- struct iscsi_data_task *dtask = &tcp_ctask->unsol_dtask;
- int start = tcp_ctask->sent;
+ iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
- rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg,
- &tcp_ctask->sent, &ctask->data_count,
- &dtask->digestbuf, &dtask->digest);
- ctask->unsol_count -= tcp_ctask->sent - start;
- if (rc)
- return rc;
- tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
- /*
- * Done with the Data-Out. Next, check if we need
- * to send another unsolicited Data-Out.
- */
- if (ctask->unsol_count) {
- debug_scsi("sending more uns\n");
- tcp_ctask->xmstate |= XMSTATE_UNS_INIT;
- goto send_hdr;
- }
- }
- return 0;
-}
-
-static int iscsi_send_sol_pdu(struct iscsi_conn *conn,
- struct iscsi_cmd_task *ctask)
-{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- struct iscsi_session *session = conn->session;
- struct iscsi_r2t_info *r2t;
- struct iscsi_data_task *dtask;
- int left, rc;
-
- if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) {
- tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
- tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
- if (!tcp_ctask->r2t) {
- spin_lock_bh(&session->lock);
- __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t,
- sizeof(void*));
- spin_unlock_bh(&session->lock);
- }
-send_hdr:
- r2t = tcp_ctask->r2t;
- dtask = &r2t->dtask;
-
- if (conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &r2t->headbuf,
- (u8*)dtask->hdrext);
- rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count);
- if (rc) {
- tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
- tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
- return rc;
- }
+ if (!count)
+ return 0;
- if (conn->datadgst_en) {
- iscsi_data_digest_init(conn->dd_data, tcp_ctask);
- dtask->digest = 0;
- }
+ if (!task->sc)
+ iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
+ else {
+ struct scsi_data_buffer *sdb = scsi_out(task->sc);
- iscsi_set_padding(tcp_ctask, r2t->data_count);
- debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
- r2t->solicit_datasn - 1, ctask->itt, r2t->data_count,
- r2t->sent);
+ err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
+ sdb->table.nents, offset,
+ count);
}
- if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) {
- r2t = tcp_ctask->r2t;
- dtask = &r2t->dtask;
-
- rc = iscsi_send_data(ctask, &r2t->sendbuf, &r2t->sg,
- &r2t->sent, &r2t->data_count,
- &dtask->digestbuf, &dtask->digest);
- if (rc)
- return rc;
- tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
-
- /*
- * Done with this Data-Out. Next, check if we have
- * to send another Data-Out for this R2T.
- */
- BUG_ON(r2t->data_length - r2t->sent < 0);
- left = r2t->data_length - r2t->sent;
- if (left) {
- iscsi_solicit_data_cont(conn, ctask, r2t, left);
- tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
- tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
- goto send_hdr;
- }
-
- /*
- * Done with this R2T. Check if there are more
- * outstanding R2Ts ready to be processed.
- */
- spin_lock_bh(&session->lock);
- tcp_ctask->r2t = NULL;
- __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
- sizeof(void*));
- if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t,
- sizeof(void*))) {
- tcp_ctask->r2t = r2t;
- tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
- tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
- spin_unlock_bh(&session->lock);
- goto send_hdr;
- }
- spin_unlock_bh(&session->lock);
+ if (err) {
+ iscsi_conn_failure(conn, err);
+ return -EIO;
}
return 0;
}
-static int
-iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- int rc = 0;
-
- debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
- conn->id, tcp_ctask->xmstate, ctask->itt);
-
- /*
- * serialize with TMF AbortTask
- */
- if (ctask->mtask)
- return rc;
-
- if (tcp_ctask->xmstate & XMSTATE_R_HDR)
- return iscsi_send_read_hdr(conn, tcp_ctask);
-
- if (tcp_ctask->xmstate & XMSTATE_W_HDR) {
- rc = iscsi_send_write_hdr(conn, ctask);
- if (rc)
- return rc;
- }
-
- if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) {
- rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg,
- &tcp_ctask->sent, &ctask->imm_count,
- &tcp_ctask->immbuf, &tcp_ctask->immdigest);
- if (rc)
- return rc;
- tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA;
- }
+ struct iscsi_tcp_task *tcp_task = task->dd_data;
- rc = iscsi_send_unsol_pdu(conn, ctask);
- if (rc)
- return rc;
-
- rc = iscsi_send_sol_pdu(conn, ctask);
- if (rc)
- return rc;
-
- return rc;
+ task->hdr = task->dd_data + sizeof(*tcp_task);
+ task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE;
+ return 0;
}
static struct iscsi_cls_conn *
-iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
+iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session,
+ uint32_t conn_idx)
{
struct iscsi_conn *conn;
struct iscsi_cls_conn *cls_conn;
struct iscsi_tcp_conn *tcp_conn;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn;
- cls_conn = iscsi_conn_setup(cls_session, conn_idx);
+ cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn),
+ conn_idx);
if (!cls_conn)
return NULL;
conn = cls_conn->dd_data;
- /*
- * due to strange issues with iser these are not set
- * in iscsi_conn_setup
- */
- conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN;
-
- tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL);
- if (!tcp_conn)
- goto tcp_conn_alloc_fail;
-
- conn->dd_data = tcp_conn;
- tcp_conn->iscsi_conn = conn;
- tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
- /* initial operational parameters */
- tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
-
- tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
- CRYPTO_ALG_ASYNC);
- tcp_conn->tx_hash.flags = 0;
- if (IS_ERR(tcp_conn->tx_hash.tfm)) {
- printk(KERN_ERR "Could not create connection due to crc32c "
- "loading error %ld. Make sure the crc32c module is "
- "built as a module or into the kernel\n",
- PTR_ERR(tcp_conn->tx_hash.tfm));
- goto free_tcp_conn;
- }
-
- tcp_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
- CRYPTO_ALG_ASYNC);
- tcp_conn->rx_hash.flags = 0;
- if (IS_ERR(tcp_conn->rx_hash.tfm)) {
- printk(KERN_ERR "Could not create connection due to crc32c "
- "loading error %ld. Make sure the crc32c module is "
- "built as a module or into the kernel\n",
- PTR_ERR(tcp_conn->rx_hash.tfm));
+ tcp_conn = conn->dd_data;
+ tcp_sw_conn = tcp_conn->dd_data;
+
+ tcp_sw_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
+ CRYPTO_ALG_ASYNC);
+ tcp_sw_conn->tx_hash.flags = 0;
+ if (IS_ERR(tcp_sw_conn->tx_hash.tfm))
+ goto free_conn;
+
+ tcp_sw_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
+ CRYPTO_ALG_ASYNC);
+ tcp_sw_conn->rx_hash.flags = 0;
+ if (IS_ERR(tcp_sw_conn->rx_hash.tfm))
goto free_tx_tfm;
- }
+ tcp_conn->rx_hash = &tcp_sw_conn->rx_hash;
return cls_conn;
free_tx_tfm:
- crypto_free_hash(tcp_conn->tx_hash.tfm);
-free_tcp_conn:
- kfree(tcp_conn);
-tcp_conn_alloc_fail:
- iscsi_conn_teardown(cls_conn);
+ crypto_free_hash(tcp_sw_conn->tx_hash.tfm);
+free_conn:
+ iscsi_conn_printk(KERN_ERR, conn,
+ "Could not create connection due to crc32c "
+ "loading error. Make sure the crc32c "
+ "module is built as a module or into the "
+ "kernel\n");
+ iscsi_tcp_conn_teardown(cls_conn);
return NULL;
}
-static void
-iscsi_tcp_release_conn(struct iscsi_conn *conn)
+static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn)
{
+ struct iscsi_session *session = conn->session;
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct socket *sock = tcp_sw_conn->sock;
- if (!tcp_conn->sock)
+ if (!sock)
return;
- sock_hold(tcp_conn->sock->sk);
- iscsi_conn_restore_callbacks(tcp_conn);
- sock_put(tcp_conn->sock->sk);
+ sock_hold(sock->sk);
+ iscsi_sw_tcp_conn_restore_callbacks(tcp_sw_conn);
+ sock_put(sock->sk);
- sock_release(tcp_conn->sock);
- tcp_conn->sock = NULL;
- conn->recv_lock = NULL;
+ spin_lock_bh(&session->lock);
+ tcp_sw_conn->sock = NULL;
+ spin_unlock_bh(&session->lock);
+ sockfd_put(sock);
}
-static void
-iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
+static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
{
struct iscsi_conn *conn = cls_conn->dd_data;
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
- iscsi_tcp_release_conn(conn);
- iscsi_conn_teardown(cls_conn);
+ iscsi_sw_tcp_release_conn(conn);
- if (tcp_conn->tx_hash.tfm)
- crypto_free_hash(tcp_conn->tx_hash.tfm);
- if (tcp_conn->rx_hash.tfm)
- crypto_free_hash(tcp_conn->rx_hash.tfm);
+ if (tcp_sw_conn->tx_hash.tfm)
+ crypto_free_hash(tcp_sw_conn->tx_hash.tfm);
+ if (tcp_sw_conn->rx_hash.tfm)
+ crypto_free_hash(tcp_sw_conn->rx_hash.tfm);
- kfree(tcp_conn);
+ iscsi_tcp_conn_teardown(cls_conn);
}
-static void
-iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
+static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
{
struct iscsi_conn *conn = cls_conn->dd_data;
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+
+ /* userspace may have goofed up and not bound us */
+ if (!tcp_sw_conn->sock)
+ return;
+ /*
+ * Make sure our recv side is stopped.
+ * Older tools called conn stop before ep_disconnect
+ * so IO could still be coming in.
+ */
+ write_lock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock);
+ set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
+ write_unlock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock);
iscsi_conn_stop(cls_conn, flag);
- iscsi_tcp_release_conn(conn);
- tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
+ iscsi_sw_tcp_release_conn(conn);
+}
+
+static int iscsi_sw_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock,
+ char *buf, int *port,
+ int (*getname)(struct socket *,
+ struct sockaddr *,
+ int *addrlen))
+{
+ struct sockaddr_storage *addr;
+ struct sockaddr_in6 *sin6;
+ struct sockaddr_in *sin;
+ int rc = 0, len;
+
+ addr = kmalloc(sizeof(*addr), GFP_KERNEL);
+ if (!addr)
+ return -ENOMEM;
+
+ if (getname(sock, (struct sockaddr *) addr, &len)) {
+ rc = -ENODEV;
+ goto free_addr;
+ }
+
+ switch (addr->ss_family) {
+ case AF_INET:
+ sin = (struct sockaddr_in *)addr;
+ spin_lock_bh(&conn->session->lock);
+ sprintf(buf, "%pI4", &sin->sin_addr.s_addr);
+ *port = be16_to_cpu(sin->sin_port);
+ spin_unlock_bh(&conn->session->lock);
+ break;
+ case AF_INET6:
+ sin6 = (struct sockaddr_in6 *)addr;
+ spin_lock_bh(&conn->session->lock);
+ sprintf(buf, "%pI6", &sin6->sin6_addr);
+ *port = be16_to_cpu(sin6->sin6_port);
+ spin_unlock_bh(&conn->session->lock);
+ break;
+ }
+free_addr:
+ kfree(addr);
+ return rc;
}
static int
-iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
- struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
- int is_leading)
+iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
+ struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
+ int is_leading)
{
+ struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
+ struct iscsi_host *ihost = shost_priv(shost);
struct iscsi_conn *conn = cls_conn->dd_data;
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
struct sock *sk;
struct socket *sock;
int err;
/* lookup for existing socket */
sock = sockfd_lookup((int)transport_eph, &err);
if (!sock) {
- printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
+ iscsi_conn_printk(KERN_ERR, conn,
+ "sockfd_lookup failed %d\n", err);
return -EEXIST;
}
+ /*
+ * copy these values now because if we drop the session
+ * userspace may still want to query the values since we will
+ * be using them for the reconnect
+ */
+ err = iscsi_sw_tcp_get_addr(conn, sock, conn->portal_address,
+ &conn->portal_port, kernel_getpeername);
+ if (err)
+ goto free_socket;
+
+ err = iscsi_sw_tcp_get_addr(conn, sock, ihost->local_address,
+ &ihost->local_port, kernel_getsockname);
+ if (err)
+ goto free_socket;
err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
if (err)
- return err;
+ goto free_socket;
/* bind iSCSI connection and socket */
- tcp_conn->sock = sock;
+ tcp_sw_conn->sock = sock;
/* setup Socket parameters */
sk = sock->sk;
sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
sk->sk_allocation = GFP_ATOMIC;
- /* FIXME: disable Nagle's algorithm */
-
- /*
- * Intercept TCP callbacks for sendfile like receive
- * processing.
- */
- conn->recv_lock = &sk->sk_callback_lock;
- iscsi_conn_set_callbacks(conn);
- tcp_conn->sendpage = tcp_conn->sock->ops->sendpage;
+ iscsi_sw_tcp_conn_set_callbacks(conn);
+ tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage;
/*
* set receive state machine into initial state
*/
- tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
-
- return 0;
-}
-
-/* called with host lock */
-static void
-iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask,
- char *data, uint32_t data_size)
-{
- struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
-
- iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr,
- sizeof(struct iscsi_hdr));
- tcp_mtask->xmstate = XMSTATE_IMM_HDR;
- tcp_mtask->sent = 0;
-
- if (mtask->data_count)
- iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data,
- mtask->data_count);
-}
-
-static int
-iscsi_r2tpool_alloc(struct iscsi_session *session)
-{
- int i;
- int cmd_i;
-
- /*
- * initialize per-task: R2T pool and xmit queue
- */
- for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
- struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
-
- /*
- * pre-allocated x4 as much r2ts to handle race when
- * target acks DataOut faster than we data_xmit() queues
- * could replenish r2tqueue.
- */
-
- /* R2T pool */
- if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4,
- (void***)&tcp_ctask->r2ts,
- sizeof(struct iscsi_r2t_info))) {
- goto r2t_alloc_fail;
- }
-
- /* R2T xmit queue */
- tcp_ctask->r2tqueue = kfifo_alloc(
- session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
- if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
- iscsi_pool_free(&tcp_ctask->r2tpool,
- (void**)tcp_ctask->r2ts);
- goto r2t_alloc_fail;
- }
- }
-
+ iscsi_tcp_hdr_recv_prep(tcp_conn);
return 0;
-r2t_alloc_fail:
- for (i = 0; i < cmd_i; i++) {
- struct iscsi_cmd_task *ctask = session->cmds[i];
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
-
- kfifo_free(tcp_ctask->r2tqueue);
- iscsi_pool_free(&tcp_ctask->r2tpool,
- (void**)tcp_ctask->r2ts);
- }
- return -ENOMEM;
+free_socket:
+ sockfd_put(sock);
+ return err;
}
-static void
-iscsi_r2tpool_free(struct iscsi_session *session)
-{
- int i;
-
- for (i = 0; i < session->cmds_max; i++) {
- struct iscsi_cmd_task *ctask = session->cmds[i];
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
-
- kfifo_free(tcp_ctask->r2tqueue);
- iscsi_pool_free(&tcp_ctask->r2tpool,
- (void**)tcp_ctask->r2ts);
- }
-}
-
-static int
-iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param,
- char *buf, int buflen)
+static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
+ enum iscsi_param param, char *buf,
+ int buflen)
{
struct iscsi_conn *conn = cls_conn->dd_data;
struct iscsi_session *session = conn->session;
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
int value;
switch(param) {
case ISCSI_PARAM_HDRDGST_EN:
iscsi_set_param(cls_conn, param, buf, buflen);
- tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
- if (conn->hdrdgst_en)
- tcp_conn->hdr_size += sizeof(__u32);
break;
case ISCSI_PARAM_DATADGST_EN:
iscsi_set_param(cls_conn, param, buf, buflen);
- tcp_conn->sendpage = conn->datadgst_en ?
- sock_no_sendpage : tcp_conn->sock->ops->sendpage;
+ tcp_sw_conn->sendpage = conn->datadgst_en ?
+ sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
break;
case ISCSI_PARAM_MAX_R2T:
sscanf(buf, "%d", &value);
- if (session->max_r2t == roundup_pow_of_two(value))
+ if (value <= 0 || !is_power_of_2(value))
+ return -EINVAL;
+ if (session->max_r2t == value)
break;
- iscsi_r2tpool_free(session);
+ iscsi_tcp_r2tpool_free(session);
iscsi_set_param(cls_conn, param, buf, buflen);
- if (session->max_r2t & (session->max_r2t - 1))
- session->max_r2t = roundup_pow_of_two(session->max_r2t);
- if (iscsi_r2tpool_alloc(session))
+ if (iscsi_tcp_r2tpool_alloc(session))
return -ENOMEM;
break;
default:
return 0;
}
-static int
-iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
- enum iscsi_param param, char *buf)
+static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
+ enum iscsi_param param, char *buf)
{
struct iscsi_conn *conn = cls_conn->dd_data;
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct inet_sock *inet;
- struct ipv6_pinfo *np;
- struct sock *sk;
int len;
switch(param) {
case ISCSI_PARAM_CONN_PORT:
- mutex_lock(&conn->xmitmutex);
- if (!tcp_conn->sock) {
- mutex_unlock(&conn->xmitmutex);
- return -EINVAL;
- }
-
- inet = inet_sk(tcp_conn->sock->sk);
- len = sprintf(buf, "%hu\n", be16_to_cpu(inet->dport));
- mutex_unlock(&conn->xmitmutex);
+ spin_lock_bh(&conn->session->lock);
+ len = sprintf(buf, "%hu\n", conn->portal_port);
+ spin_unlock_bh(&conn->session->lock);
break;
case ISCSI_PARAM_CONN_ADDRESS:
- mutex_lock(&conn->xmitmutex);
- if (!tcp_conn->sock) {
- mutex_unlock(&conn->xmitmutex);
- return -EINVAL;
- }
-
- sk = tcp_conn->sock->sk;
- if (sk->sk_family == PF_INET) {
- inet = inet_sk(sk);
- len = sprintf(buf, NIPQUAD_FMT "\n",
- NIPQUAD(inet->daddr));
- } else {
- np = inet6_sk(sk);
- len = sprintf(buf, NIP6_FMT "\n", NIP6(np->daddr));
- }
- mutex_unlock(&conn->xmitmutex);
+ spin_lock_bh(&conn->session->lock);
+ len = sprintf(buf, "%s\n", conn->portal_address);
+ spin_unlock_bh(&conn->session->lock);
break;
default:
return iscsi_conn_get_param(cls_conn, param, buf);
}
static void
-iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
+iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
+ struct iscsi_stats *stats)
{
struct iscsi_conn *conn = cls_conn->dd_data;
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
- stats->txdata_octets = conn->txdata_octets;
- stats->rxdata_octets = conn->rxdata_octets;
- stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
- stats->dataout_pdus = conn->dataout_pdus_cnt;
- stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
- stats->datain_pdus = conn->datain_pdus_cnt;
- stats->r2t_pdus = conn->r2t_pdus_cnt;
- stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
- stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
stats->custom_length = 3;
strcpy(stats->custom[0].desc, "tx_sendpage_failures");
- stats->custom[0].value = tcp_conn->sendpage_failures_cnt;
+ stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt;
strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
- stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt;
+ stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt;
strcpy(stats->custom[2].desc, "eh_abort_cnt");
stats->custom[2].value = conn->eh_abort_cnt;
+
+ iscsi_tcp_conn_get_stats(cls_conn, stats);
}
static struct iscsi_cls_session *
-iscsi_tcp_session_create(struct iscsi_transport *iscsit,
- struct scsi_transport_template *scsit,
- uint32_t initial_cmdsn, uint32_t *hostno)
+iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
+ uint16_t qdepth, uint32_t initial_cmdsn,
+ uint32_t *hostno)
{
struct iscsi_cls_session *cls_session;
struct iscsi_session *session;
- uint32_t hn;
- int cmd_i;
+ struct Scsi_Host *shost;
- cls_session = iscsi_session_setup(iscsit, scsit,
- sizeof(struct iscsi_tcp_cmd_task),
- sizeof(struct iscsi_tcp_mgmt_task),
- initial_cmdsn, &hn);
- if (!cls_session)
+ if (ep) {
+ printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep);
return NULL;
- *hostno = hn;
-
- session = class_to_transport_session(cls_session);
- for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
- struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
-
- ctask->hdr = &tcp_ctask->hdr;
}
- for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
- struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
- struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
-
- mtask->hdr = &tcp_mtask->hdr;
- }
-
- if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session)))
- goto r2tpool_alloc_fail;
+ shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, 0, qdepth);
+ if (!shost)
+ return NULL;
+ shost->transportt = iscsi_sw_tcp_scsi_transport;
+ shost->max_lun = iscsi_max_lun;
+ shost->max_id = 0;
+ shost->max_channel = 0;
+ shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
+
+ if (iscsi_host_add(shost, NULL))
+ goto free_host;
+ *hostno = shost->host_no;
+
+ cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost,
+ cmds_max,
+ sizeof(struct iscsi_tcp_task) +
+ sizeof(struct iscsi_sw_tcp_hdrbuf),
+ initial_cmdsn, 0);
+ if (!cls_session)
+ goto remove_host;
+ session = cls_session->dd_data;
+ shost->can_queue = session->scsi_cmds_max;
+ if (iscsi_tcp_r2tpool_alloc(session))
+ goto remove_session;
return cls_session;
-r2tpool_alloc_fail:
+remove_session:
iscsi_session_teardown(cls_session);
+remove_host:
+ iscsi_host_remove(shost);
+free_host:
+ iscsi_host_free(shost);
return NULL;
}
-static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session)
+static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session)
{
- iscsi_r2tpool_free(class_to_transport_session(cls_session));
+ struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
+
+ iscsi_tcp_r2tpool_free(cls_session->dd_data);
iscsi_session_teardown(cls_session);
+
+ iscsi_host_remove(shost);
+ iscsi_host_free(shost);
+}
+
+static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
+{
+ blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY);
+ blk_queue_dma_alignment(sdev->request_queue, 0);
+ return 0;
}
-static struct scsi_host_template iscsi_sht = {
+static struct scsi_host_template iscsi_sw_tcp_sht = {
+ .module = THIS_MODULE,
.name = "iSCSI Initiator over TCP/IP",
.queuecommand = iscsi_queuecommand,
.change_queue_depth = iscsi_change_queue_depth,
- .can_queue = ISCSI_XMIT_CMDS_MAX - 1,
- .sg_tablesize = ISCSI_SG_TABLESIZE,
+ .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1,
+ .sg_tablesize = 4096,
.max_sectors = 0xFFFF,
.cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
.eh_abort_handler = iscsi_eh_abort,
- .eh_host_reset_handler = iscsi_eh_host_reset,
+ .eh_device_reset_handler= iscsi_eh_device_reset,
+ .eh_target_reset_handler= iscsi_eh_target_reset,
.use_clustering = DISABLE_CLUSTERING,
+ .slave_configure = iscsi_sw_tcp_slave_configure,
.proc_name = "iscsi_tcp",
.this_id = -1,
};
-static struct iscsi_transport iscsi_tcp_transport = {
+static struct iscsi_transport iscsi_sw_tcp_transport = {
.owner = THIS_MODULE,
.name = "tcp",
.caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
ISCSI_EXP_STATSN |
ISCSI_PERSISTENT_PORT |
ISCSI_PERSISTENT_ADDRESS |
- ISCSI_TARGET_NAME |
- ISCSI_TPGT,
- .host_param_mask = ISCSI_HOST_HWADDRESS |
- ISCSI_HOST_INITIATOR_NAME,
- .host_template = &iscsi_sht,
- .conndata_size = sizeof(struct iscsi_conn),
- .max_conn = 1,
- .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
+ ISCSI_TARGET_NAME | ISCSI_TPGT |
+ ISCSI_USERNAME | ISCSI_PASSWORD |
+ ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
+ ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
+ ISCSI_LU_RESET_TMO |
+ ISCSI_PING_TMO | ISCSI_RECV_TMO |
+ ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
+ .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
+ ISCSI_HOST_INITIATOR_NAME |
+ ISCSI_HOST_NETDEV_NAME,
/* session management */
- .create_session = iscsi_tcp_session_create,
- .destroy_session = iscsi_tcp_session_destroy,
+ .create_session = iscsi_sw_tcp_session_create,
+ .destroy_session = iscsi_sw_tcp_session_destroy,
/* connection management */
- .create_conn = iscsi_tcp_conn_create,
- .bind_conn = iscsi_tcp_conn_bind,
- .destroy_conn = iscsi_tcp_conn_destroy,
- .set_param = iscsi_conn_set_param,
- .get_conn_param = iscsi_tcp_conn_get_param,
+ .create_conn = iscsi_sw_tcp_conn_create,
+ .bind_conn = iscsi_sw_tcp_conn_bind,
+ .destroy_conn = iscsi_sw_tcp_conn_destroy,
+ .set_param = iscsi_sw_tcp_conn_set_param,
+ .get_conn_param = iscsi_sw_tcp_conn_get_param,
.get_session_param = iscsi_session_get_param,
.start_conn = iscsi_conn_start,
- .stop_conn = iscsi_tcp_conn_stop,
+ .stop_conn = iscsi_sw_tcp_conn_stop,
/* iscsi host params */
.get_host_param = iscsi_host_get_param,
.set_host_param = iscsi_host_set_param,
/* IO */
.send_pdu = iscsi_conn_send_pdu,
- .get_stats = iscsi_conn_get_stats,
- .init_cmd_task = iscsi_tcp_cmd_init,
- .init_mgmt_task = iscsi_tcp_mgmt_init,
- .xmit_cmd_task = iscsi_tcp_ctask_xmit,
- .xmit_mgmt_task = iscsi_tcp_mtask_xmit,
- .cleanup_cmd_task = iscsi_tcp_cleanup_ctask,
+ .get_stats = iscsi_sw_tcp_conn_get_stats,
+ /* iscsi task/cmd helpers */
+ .init_task = iscsi_tcp_task_init,
+ .xmit_task = iscsi_tcp_task_xmit,
+ .cleanup_task = iscsi_tcp_cleanup_task,
+ /* low level pdu helpers */
+ .xmit_pdu = iscsi_sw_tcp_pdu_xmit,
+ .init_pdu = iscsi_sw_tcp_pdu_init,
+ .alloc_pdu = iscsi_sw_tcp_pdu_alloc,
/* recovery */
.session_recovery_timedout = iscsi_session_recovery_timedout,
};
-static int __init
-iscsi_tcp_init(void)
+static int __init iscsi_sw_tcp_init(void)
{
if (iscsi_max_lun < 1) {
printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
iscsi_max_lun);
return -EINVAL;
}
- iscsi_tcp_transport.max_lun = iscsi_max_lun;
- if (!iscsi_register_transport(&iscsi_tcp_transport))
+ iscsi_sw_tcp_scsi_transport = iscsi_register_transport(
+ &iscsi_sw_tcp_transport);
+ if (!iscsi_sw_tcp_scsi_transport)
return -ENODEV;
return 0;
}
-static void __exit
-iscsi_tcp_exit(void)
+static void __exit iscsi_sw_tcp_exit(void)
{
- iscsi_unregister_transport(&iscsi_tcp_transport);
+ iscsi_unregister_transport(&iscsi_sw_tcp_transport);
}
-module_init(iscsi_tcp_init);
-module_exit(iscsi_tcp_exit);
+module_init(iscsi_sw_tcp_init);
+module_exit(iscsi_sw_tcp_exit);
Code Review / linux-2.6.git / blobdiff