litmus-rt.git - The LITMUS^RT kernel.

diff options

Diffstat (limited to 'drivers/dma/ste_dma40_ll.c')

-rw-r--r--

1 files changed, 4 insertions, 2 deletions

                 dst |= 1 << D40_SREG_CFG_PRI_POS;
         }
-        src |= cfg->src_info.endianess << D40_SREG_CFG_LBE_POS;
+        if (cfg->src_info.big_endian)
-        dst |= cfg->dst_info.endianess << D40_SREG_CFG_LBE_POS;
+                src |= 1 << D40_SREG_CFG_LBE_POS;
+        if (cfg->dst_info.big_endian)
+                dst |= 1 << D40_SREG_CFG_LBE_POS;
         *src_cfg = src;
         *dst_cfg = dst;

/* * iSCSI Initiator over TCP/IP Data-Path * * Copyright (C) 2004 Dmitry Yusupov * Copyright (C) 2004 Alex Aizman * Copyright (C) 2005 - 2006 Mike Christie * Copyright (C) 2006 Red Hat, Inc. All rights reserved. * maintained by open-iscsi@googlegroups.com * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published * by the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * See the file COPYING included with this distribution for more details. * * Credits: * Christoph Hellwig * FUJITA Tomonori * Arne Redlich * Zhenyu Wang */ #include <linux/types.h> #include <linux/list.h> #include <linux/inet.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_host.h> #include <scsi/scsi.h> #include <scsi/scsi_transport_iscsi.h> #include "iscsi_tcp.h" #define ISCSI_TCP_VERSION "1.0-595" MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, " "Alex Aizman <itn780@yahoo.com>"); MODULE_DESCRIPTION("iSCSI/TCP data-path"); MODULE_LICENSE("GPL"); MODULE_VERSION(ISCSI_TCP_VERSION); /* #define DEBUG_TCP */ #define DEBUG_ASSERT #ifdef DEBUG_TCP #define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt) #else #define debug_tcp(fmt...) #endif #ifndef DEBUG_ASSERT #ifdef BUG_ON #undef BUG_ON #endif #define BUG_ON(expr) #endif 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_digest_digest(tcp_conn->tx_tfm, &buf->sg, 1, crc); buf->sg.length += sizeof(uint32_t); } 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; struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; 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(&tcp_ctask->sendbuf, (char*)sc->request_buffer + r2t->data_offset, r2t->data_count); } /** * 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) 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 || r2t->data_length > session->max_burst) { spin_unlock(&session->lock); return ISCSI_ERR_DATALEN; } r2t->data_offset = be32_to_cpu(rhdr->data_offset); if (r2t->data_offset + r2t->data_length > ctask->total_length) { spin_unlock(&session->lock); 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; tcp_ctask->xmstate |= XMSTATE_SOL_HDR; __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*)); 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_digest_digest(tcp_conn->rx_tfm, &sg, 1, (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); iscsi_tcp_cleanup_ctask(conn, tcp_conn->in.ctask); 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 (DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH < 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, DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, 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) { struct iscsi_tcp_conn *tcp_conn = conn->dd_data; int buf_size = tcp_conn->in.datalen; 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 iscsi_tcp_conn *tcp_conn, struct scatterlist *sg, int offset, int length) { struct scatterlist temp; memcpy(&temp, sg, sizeof(struct scatterlist)); temp.offset = offset; temp.length = length; crypto_digest_update(tcp_conn->data_rx_tfm, &temp, 1); } 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_digest_update(tcp_conn->data_rx_tfm, &tmp, 1); } 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_digest_update( tcp_conn->data_rx_tfm, &sg[i], 1); else partial_sg_digest_update(tcp_conn, &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, &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_tcp_cleanup_ctask(conn, ctask); __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: spin_lock(&conn->session->lock); iscsi_tcp_cleanup_ctask(conn, tcp_conn->in.ctask); spin_unlock(&conn->session->lock); 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)) { 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 * @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) { 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; } 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) { BUG_ON(!tcp_conn->data_rx_tfm); crypto_digest_init(tcp_conn->data_rx_tfm); } tcp_conn->in_progress = IN_PROGRESS_DATA_RECV; } else if (rc) { iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); return 0; } } 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); skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, &recv_digest, 4); tcp_conn->in.offset += 4; tcp_conn->in.copy -= 4; 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_digest_update(tcp_conn->data_rx_tfm, &sg, 1); } crypto_digest_final(tcp_conn->data_rx_tfm, (u8 *) & tcp_conn->in.datadgst); debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst); tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; } 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; } static void iscsi_tcp_data_ready(struct sock *sk, int flag) { struct iscsi_conn *conn = sk->sk_user_data; read_descriptor_t rd_desc; read_lock(&sk->sk_callback_lock); /* * Use rd_desc to pass 'conn' to iscsi_tcp_data_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 * 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); read_unlock(&sk->sk_callback_lock); } static void iscsi_tcp_state_change(struct sock *sk) { struct iscsi_tcp_conn *tcp_conn; struct iscsi_conn *conn; struct iscsi_session *session; void (*old_state_change)(struct sock *); read_lock(&sk->sk_callback_lock); conn = (struct iscsi_conn*)sk->sk_user_data; session = conn->session; if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) && !atomic_read(&sk->sk_rmem_alloc)) { debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n"); iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); } tcp_conn = conn->dd_data; old_state_change = tcp_conn->old_state_change; read_unlock(&sk->sk_callback_lock); old_state_change(sk); } /** * 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) { struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; struct iscsi_tcp_conn *tcp_conn = conn->dd_data; tcp_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) { struct iscsi_tcp_conn *tcp_conn = conn->dd_data; struct sock *sk = tcp_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; write_unlock_bh(&sk->sk_callback_lock); } static void iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn) { struct sock *sk = tcp_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_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 */ 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; } tcp_conn->sendpage_failures_cnt++; if (res == -EAGAIN) res = -ENOBUFS; else iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); return res; } /** * 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; } return res; } /** * 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) **/ static inline int iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, int *count, int *sent) { 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; } return res; } static inline void iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask) { struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; BUG_ON(!tcp_conn->data_tx_tfm); crypto_digest_init(tcp_conn->data_tx_tfm); tcp_ctask->digest_count = 4; } static int iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, struct iscsi_buf *buf, uint32_t *digest, int final) { struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct iscsi_tcp_conn *tcp_conn = conn->dd_data; int rc = 0; int sent = 0; if (final) crypto_digest_final(tcp_conn->data_tx_tfm, (u8*)digest); iscsi_buf_init_iov(buf, (char*)digest, 4); rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent); if (rc) { tcp_ctask->datadigest = *digest; tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; } else tcp_ctask->digest_count = 4; return 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_tcp_cmd_task *tcp_ctask = ctask->dd_data; 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; } conn->dataout_pdus_cnt++; iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr, sizeof(struct iscsi_hdr)); if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) { BUG_ON(tcp_ctask->bad_sg == r2t->sg); iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); r2t->sg += 1; } else iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)sc->request_buffer + new_offset, r2t->data_count); } static void iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct iscsi_data_task *dtask; dtask = tcp_ctask->dtask = &tcp_ctask->unsol_dtask; iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr, tcp_ctask->r2t_data_count); iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr, sizeof(struct iscsi_hdr)); } /** * 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) { 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; iscsi_buf_init_sg(&tcp_ctask->sendbuf, &sg[tcp_ctask->sg_count++]); tcp_ctask->sg = sg; tcp_ctask->bad_sg = sg + sc->use_sg; } else iscsi_buf_init_iov(&tcp_ctask->sendbuf, sc->request_buffer, sc->request_bufflen); if (ctask->imm_count) tcp_ctask->xmstate |= XMSTATE_IMM_DATA; tcp_ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1); if (tcp_ctask->pad_count) { 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; } if (ctask->unsol_count) tcp_ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT; tcp_ctask->r2t_data_count = ctask->total_length - ctask->imm_count - ctask->unsol_count; debug_scsi("cmd [itt 0x%x total %d imm %d imm_data %d " "r2t_data %d]\n", ctask->itt, ctask->total_length, ctask->imm_count, ctask->unsol_count, tcp_ctask->r2t_data_count); } else tcp_ctask->xmstate = XMSTATE_R_HDR; iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr, sizeof(struct iscsi_hdr)); } /** * 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) { struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; 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; 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 == cpu_to_be32(ISCSI_RESERVED_TAG)) { 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 handle_xmstate_r_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 handle_xmstate_w_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { 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; } static inline int handle_xmstate_data_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; int rc; tcp_ctask->xmstate &= ~XMSTATE_DATA_DIGEST; debug_tcp("resent data digest 0x%x\n", tcp_ctask->datadigest); rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, &tcp_ctask->datadigest, 0); if (rc) { tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; debug_tcp("resent data digest 0x%x fail!\n", tcp_ctask->datadigest); } return rc; } static inline int handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct iscsi_tcp_conn *tcp_conn = conn->dd_data; int rc; BUG_ON(!ctask->imm_count); tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA; if (conn->datadgst_en) { iscsi_data_digest_init(tcp_conn, ctask); tcp_ctask->immdigest = 0; } for (;;) { rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &ctask->imm_count, &tcp_ctask->sent); if (rc) { tcp_ctask->xmstate |= XMSTATE_IMM_DATA; if (conn->datadgst_en) { crypto_digest_final(tcp_conn->data_tx_tfm, (u8*)&tcp_ctask->immdigest); debug_tcp("tx imm sendpage fail 0x%x\n", tcp_ctask->datadigest); } return rc; } if (conn->datadgst_en) crypto_digest_update(tcp_conn->data_tx_tfm, &tcp_ctask->sendbuf.sg, 1); if (!ctask->imm_count) break; iscsi_buf_init_sg(&tcp_ctask->sendbuf, &tcp_ctask->sg[tcp_ctask->sg_count++]); } if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, &tcp_ctask->immdigest, 1); if (rc) { debug_tcp("sending imm digest 0x%x fail!\n", tcp_ctask->immdigest); return rc; } debug_tcp("sending imm digest 0x%x\n", tcp_ctask->immdigest); } return 0; } static inline int handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { 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) { iscsi_unsolicit_data_init(conn, ctask); dtask = tcp_ctask->dtask; if (conn->hdrdgst_en) iscsi_hdr_digest(conn, &tcp_ctask->headbuf, (u8*)dtask->hdrext); tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT; } 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; } debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", ctask->itt, ctask->unsol_count, tcp_ctask->sent); return 0; } static inline int handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct iscsi_data_task *dtask = tcp_ctask->dtask; struct iscsi_tcp_conn *tcp_conn = conn->dd_data; int rc; BUG_ON(!ctask->data_count); tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; if (conn->datadgst_en) { iscsi_data_digest_init(tcp_conn, ctask); dtask->digest = 0; } for (;;) { int start = tcp_ctask->sent; rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &ctask->data_count, &tcp_ctask->sent); if (rc) { ctask->unsol_count -= tcp_ctask->sent - start; tcp_ctask->xmstate |= XMSTATE_UNS_DATA; /* will continue with this ctask later.. */ if (conn->datadgst_en) { crypto_digest_final(tcp_conn->data_tx_tfm, (u8 *)&dtask->digest); debug_tcp("tx uns data fail 0x%x\n", dtask->digest); } return rc; } BUG_ON(tcp_ctask->sent > ctask->total_length); ctask->unsol_count -= tcp_ctask->sent - start; /* * XXX:we may run here with un-initial sendbuf. * so pass it */ if (conn->datadgst_en && tcp_ctask->sent - start > 0) crypto_digest_update(tcp_conn->data_tx_tfm, &tcp_ctask->sendbuf.sg, 1); if (!ctask->data_count) break; iscsi_buf_init_sg(&tcp_ctask->sendbuf, &tcp_ctask->sg[tcp_ctask->sg_count++]); } BUG_ON(ctask->unsol_count < 0); /* * Done with the Data-Out. Next, check if we need * to send another unsolicited Data-Out. */ if (ctask->unsol_count) { if (conn->datadgst_en) { rc = iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, &dtask->digest, 1); if (rc) { debug_tcp("send uns digest 0x%x fail\n", dtask->digest); return rc; } debug_tcp("sending uns digest 0x%x, more uns\n", dtask->digest); } tcp_ctask->xmstate |= XMSTATE_UNS_INIT; return 1; } if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { rc = iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, &dtask->digest, 1); if (rc) { debug_tcp("send last uns digest 0x%x fail\n", dtask->digest); return rc; } debug_tcp("sending uns digest 0x%x\n",dtask->digest); } return 0; } static inline int handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { struct iscsi_session *session = conn->session; struct iscsi_tcp_conn *tcp_conn = conn->dd_data; struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct iscsi_r2t_info *r2t = tcp_ctask->r2t; struct iscsi_data_task *dtask = &r2t->dtask; int left, rc; tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; tcp_ctask->dtask = dtask; if (conn->datadgst_en) { iscsi_data_digest_init(tcp_conn, ctask); dtask->digest = 0; } solicit_again: /* * send Data-Out within this R2T sequence. */ if (!r2t->data_count) goto data_out_done; rc = iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent); if (rc) { tcp_ctask->xmstate |= XMSTATE_SOL_DATA; /* will continue with this ctask later.. */ if (conn->datadgst_en) { crypto_digest_final(tcp_conn->data_tx_tfm, (u8 *)&dtask->digest); debug_tcp("r2t data send fail 0x%x\n", dtask->digest); } return rc; } BUG_ON(r2t->data_count < 0); if (conn->datadgst_en) crypto_digest_update(tcp_conn->data_tx_tfm, &r2t->sendbuf.sg, 1); if (r2t->data_count) { BUG_ON(ctask->sc->use_sg == 0); if (!iscsi_buf_left(&r2t->sendbuf)) { BUG_ON(tcp_ctask->bad_sg == r2t->sg); iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); r2t->sg += 1; } goto solicit_again; } data_out_done: /* * 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) { if (conn->datadgst_en) { rc = iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, &dtask->digest, 1); if (rc) { debug_tcp("send r2t data digest 0x%x" "fail\n", dtask->digest); return rc; } debug_tcp("r2t data send digest 0x%x\n", dtask->digest); } iscsi_solicit_data_cont(conn, ctask, r2t, left); tcp_ctask->xmstate |= XMSTATE_SOL_DATA; tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; return 1; } /* * Done with this R2T. Check if there are more * outstanding R2Ts ready to be processed. */ BUG_ON(tcp_ctask->r2t_data_count - r2t->data_length < 0); if (conn->datadgst_en) { rc = iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, &dtask->digest, 1); if (rc) { debug_tcp("send last r2t data digest 0x%x" "fail\n", dtask->digest); return rc; } debug_tcp("r2t done dout digest 0x%x\n", dtask->digest); } tcp_ctask->r2t_data_count -= r2t->data_length; tcp_ctask->r2t = NULL; spin_lock_bh(&session->lock); __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); spin_unlock_bh(&session->lock); 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; return 1; } return 0; } static inline int handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct iscsi_tcp_conn *tcp_conn = conn->dd_data; struct iscsi_data_task *dtask = tcp_ctask->dtask; int sent = 0, rc; tcp_ctask->xmstate &= ~XMSTATE_W_PAD; iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad, tcp_ctask->pad_count); rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count, &sent); if (rc) { tcp_ctask->xmstate |= XMSTATE_W_PAD; return rc; } if (conn->datadgst_en) { crypto_digest_update(tcp_conn->data_tx_tfm, &tcp_ctask->sendbuf.sg, 1); /* imm data? */ if (!dtask) { rc = iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, &tcp_ctask->immdigest, 1); if (rc) { debug_tcp("send padding digest 0x%x" "fail!\n", tcp_ctask->immdigest); return rc; } debug_tcp("done with padding, digest 0x%x\n", tcp_ctask->datadigest); } else { rc = iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, &dtask->digest, 1); if (rc) { debug_tcp("send padding digest 0x%x" "fail\n", dtask->digest); return rc; } debug_tcp("done with padding, digest 0x%x\n", dtask->digest); } } return 0; } static int iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { 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 handle_xmstate_r_hdr(conn, tcp_ctask); if (tcp_ctask->xmstate & XMSTATE_W_HDR) { rc = handle_xmstate_w_hdr(conn, ctask); if (rc) return rc; } /* XXX: for data digest xmit recover */ if (tcp_ctask->xmstate & XMSTATE_DATA_DIGEST) { rc = handle_xmstate_data_digest(conn, ctask); if (rc) return rc; } if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) { rc = handle_xmstate_imm_data(conn, ctask); if (rc) return rc; } if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) { BUG_ON(!ctask->unsol_count); tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR; unsolicit_head_again: rc = handle_xmstate_uns_hdr(conn, ctask); if (rc) return rc; } if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) { rc = handle_xmstate_uns_data(conn, ctask); if (rc == 1) goto unsolicit_head_again; else if (rc) return rc; goto done; } if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) { struct iscsi_r2t_info *r2t; tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; tcp_ctask->xmstate |= XMSTATE_SOL_DATA; if (!tcp_ctask->r2t) __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, sizeof(void*)); solicit_head_again: r2t = tcp_ctask->r2t;


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