-static unsigned int iscsi_max_lun = 512;
-module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
-
-static int iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_segment *segment);
-
-/*
- * Scatterlist handling: inside the iscsi_segment, we
- * remember an index into the scatterlist, and set data/size
- * to the current scatterlist entry. For highmem pages, we
- * kmap as needed.
- *
- * Note that the page is unmapped when we return from
- * TCP's data_ready handler, so we may end up mapping and
- * unmapping the same page repeatedly. The whole reason
- * for this is that we shouldn't keep the page mapped
- * outside the softirq.
- */
-
-/**
- * iscsi_tcp_segment_init_sg - init indicated scatterlist entry
- * @segment: the buffer object
- * @sg: scatterlist
- * @offset: byte offset into that sg entry
- *
- * This function sets up the segment so that subsequent
- * data is copied to the indicated sg entry, at the given
- * offset.
- */
-static inline void
-iscsi_tcp_segment_init_sg(struct iscsi_segment *segment,
- struct scatterlist *sg, unsigned int offset)
-{
- segment->sg = sg;
- segment->sg_offset = offset;
- segment->size = min(sg->length - offset,
- segment->total_size - segment->total_copied);
- segment->data = NULL;
-}
-
-/**
- * iscsi_tcp_segment_map - map the current S/G page
- * @segment: iscsi_segment
- * @recv: 1 if called from recv path
- *
- * We only need to possibly kmap data if scatter lists are being used,
- * because the iscsi passthrough and internal IO paths will never use high
- * mem pages.
- */
-static inline void
-iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv)
-{
- struct scatterlist *sg;
-
- if (segment->data != NULL || !segment->sg)
- return;
-
- sg = segment->sg;
- BUG_ON(segment->sg_mapped);
- BUG_ON(sg->length == 0);
-
- /*
- * If the page count is greater than one it is ok to send
- * to the network layer's zero copy send path. If not we
- * have to go the slow sendmsg path. We always map for the
- * recv path.
- */
- if (page_count(sg_page(sg)) >= 1 && !recv)
- return;
-
- debug_tcp("iscsi_tcp_segment_map %s %p\n", recv ? "recv" : "xmit",
- segment);
- segment->sg_mapped = kmap_atomic(sg_page(sg), KM_SOFTIRQ0);
- segment->data = segment->sg_mapped + sg->offset + segment->sg_offset;
-}
-
-static inline void
-iscsi_tcp_segment_unmap(struct iscsi_segment *segment)
-{
- debug_tcp("iscsi_tcp_segment_unmap %p\n", segment);
-
- if (segment->sg_mapped) {
- debug_tcp("iscsi_tcp_segment_unmap valid\n");
- kunmap_atomic(segment->sg_mapped, KM_SOFTIRQ0);
- segment->sg_mapped = NULL;
- segment->data = NULL;
- }
-}
-
-/*
- * Splice the digest buffer into the buffer
- */
-static inline void
-iscsi_tcp_segment_splice_digest(struct iscsi_segment *segment, void *digest)
-{
- segment->data = digest;
- segment->digest_len = ISCSI_DIGEST_SIZE;
- segment->total_size += ISCSI_DIGEST_SIZE;
- segment->size = ISCSI_DIGEST_SIZE;
- segment->copied = 0;
- segment->sg = NULL;
- segment->hash = NULL;
-}
-
-/**
- * iscsi_tcp_segment_done - check whether the segment is complete
- * @segment: iscsi segment to check
- * @recv: set to one of this is called from the recv path
- * @copied: number of bytes copied
- *
- * Check if we're done receiving this segment. If the receive
- * buffer is full but we expect more data, move on to the
- * next entry in the scatterlist.
- *
- * If the amount of data we received isn't a multiple of 4,
- * we will transparently receive the pad bytes, too.
- *
- * This function must be re-entrant.
- */
-static inline int
-iscsi_tcp_segment_done(struct iscsi_segment *segment, int recv, unsigned copied)
-{
- static unsigned char padbuf[ISCSI_PAD_LEN];
- struct scatterlist sg;
- unsigned int pad;
-
- debug_tcp("copied %u %u size %u %s\n", segment->copied, copied,
- segment->size, recv ? "recv" : "xmit");
- if (segment->hash && copied) {
- /*
- * If a segment is kmapd we must unmap it before sending
- * to the crypto layer since that will try to kmap it again.
- */
- iscsi_tcp_segment_unmap(segment);
-
- if (!segment->data) {
- sg_init_table(&sg, 1);
- sg_set_page(&sg, sg_page(segment->sg), copied,
- segment->copied + segment->sg_offset +
- segment->sg->offset);
- } else
- sg_init_one(&sg, segment->data + segment->copied,
- copied);
- crypto_hash_update(segment->hash, &sg, copied);
- }
-
- segment->copied += copied;
- if (segment->copied < segment->size) {
- iscsi_tcp_segment_map(segment, recv);
- return 0;
- }
-
- segment->total_copied += segment->copied;
- segment->copied = 0;
- segment->size = 0;
-
- /* Unmap the current scatterlist page, if there is one. */
- iscsi_tcp_segment_unmap(segment);
-
- /* Do we have more scatterlist entries? */
- debug_tcp("total copied %u total size %u\n", segment->total_copied,
- segment->total_size);
- if (segment->total_copied < segment->total_size) {
- /* Proceed to the next entry in the scatterlist. */
- iscsi_tcp_segment_init_sg(segment, sg_next(segment->sg),
- 0);
- iscsi_tcp_segment_map(segment, recv);
- BUG_ON(segment->size == 0);
- return 0;
- }
-
- /* Do we need to handle padding? */
- pad = iscsi_padding(segment->total_copied);
- if (pad != 0) {
- debug_tcp("consume %d pad bytes\n", pad);
- segment->total_size += pad;
- segment->size = pad;
- segment->data = padbuf;
- return 0;
- }
-
- /*
- * Set us up for transferring the data digest. hdr digest
- * is completely handled in hdr done function.
- */
- if (segment->hash) {
- crypto_hash_final(segment->hash, segment->digest);
- iscsi_tcp_segment_splice_digest(segment,
- recv ? segment->recv_digest : segment->digest);
- return 0;
- }
-
- return 1;
-}
-
-/**
- * iscsi_tcp_xmit_segment - transmit segment
- * @tcp_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 int
-iscsi_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_segment *segment)
-{
- struct socket *sk = tcp_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_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
- };
-
- r = kernel_sendmsg(sk, &msg, &iov, 1, copy);
- }
-
- if (r < 0) {
- iscsi_tcp_segment_unmap(segment);
- if (copied || r == -EAGAIN)
- break;
- return r;
- }
- copied += r;
- }
- return copied;
-}
-
-/**
- * iscsi_tcp_segment_recv - copy data to segment
- * @tcp_conn: the iSCSI TCP connection
- * @segment: the buffer to copy to
- * @ptr: data pointer
- * @len: amount of data available
- *
- * This function copies up to @len bytes to the
- * given buffer, and returns the number of bytes
- * consumed, which can actually be less than @len.
- *
- * If hash digest is enabled, the function will update the
- * hash while copying.
- * Combining these two operations doesn't buy us a lot (yet),
- * but in the future we could implement combined copy+crc,
- * just way we do for network layer checksums.
- */
-static int
-iscsi_tcp_segment_recv(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_segment *segment, const void *ptr,
- unsigned int len)
-{
- unsigned int copy = 0, copied = 0;
-
- while (!iscsi_tcp_segment_done(segment, 1, copy)) {
- if (copied == len) {
- debug_tcp("iscsi_tcp_segment_recv copied %d bytes\n",
- len);
- break;
- }
-
- copy = min(len - copied, segment->size - segment->copied);
- debug_tcp("iscsi_tcp_segment_recv copying %d\n", copy);
- memcpy(segment->data + segment->copied, ptr + copied, copy);
- copied += copy;
- }
- return copied;
-}
-
-static inline void
-iscsi_tcp_dgst_header(struct hash_desc *hash, const void *hdr, size_t hdrlen,
- unsigned char digest[ISCSI_DIGEST_SIZE])
-{
- struct scatterlist sg;
-
- sg_init_one(&sg, hdr, hdrlen);
- crypto_hash_digest(hash, &sg, hdrlen, digest);
-}
-
-static inline int
-iscsi_tcp_dgst_verify(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_segment *segment)
-{
- if (!segment->digest_len)
- return 1;
-
- if (memcmp(segment->recv_digest, segment->digest,
- segment->digest_len)) {
- debug_scsi("digest mismatch\n");
- return 0;
- }
-
- return 1;
-}
-
-/*
- * Helper function to set up segment buffer
- */
-static inline void
-__iscsi_segment_init(struct iscsi_segment *segment, size_t size,
- iscsi_segment_done_fn_t *done, struct hash_desc *hash)
-{
- memset(segment, 0, sizeof(*segment));
- segment->total_size = size;
- segment->done = done;
-
- if (hash) {
- segment->hash = hash;
- crypto_hash_init(hash);
- }
-}
-
-static inline void
-iscsi_segment_init_linear(struct iscsi_segment *segment, void *data,
- size_t size, iscsi_segment_done_fn_t *done,
- struct hash_desc *hash)
-{
- __iscsi_segment_init(segment, size, done, hash);
- segment->data = data;
- segment->size = size;
-}
-
-static inline int
-iscsi_segment_seek_sg(struct iscsi_segment *segment,
- struct scatterlist *sg_list, unsigned int sg_count,
- unsigned int offset, size_t size,
- iscsi_segment_done_fn_t *done, struct hash_desc *hash)
-{
- struct scatterlist *sg;
- unsigned int i;
-
- debug_scsi("iscsi_segment_seek_sg offset %u size %llu\n",
- offset, size);
- __iscsi_segment_init(segment, size, done, hash);
- for_each_sg(sg_list, sg, sg_count, i) {
- debug_scsi("sg %d, len %u offset %u\n", i, sg->length,
- sg->offset);
- if (offset < sg->length) {
- iscsi_tcp_segment_init_sg(segment, sg, offset);
- return 0;
- }
- offset -= sg->length;
- }
-
- return ISCSI_ERR_DATA_OFFSET;
-}
-
-/**
- * iscsi_tcp_hdr_recv_prep - prep segment for hdr reception
- * @tcp_conn: iscsi connection to prep for
- *
- * This function always passes NULL for the hash argument, because when this
- * function is called we do not yet know the final size of the header and want
- * to delay the digest processing until we know that.
- */
-static void
-iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn)
-{
- debug_tcp("iscsi_tcp_hdr_recv_prep(%p%s)\n", tcp_conn,
- tcp_conn->iscsi_conn->hdrdgst_en ? ", digest enabled" : "");
- iscsi_segment_init_linear(&tcp_conn->in.segment,
- tcp_conn->in.hdr_buf, sizeof(struct iscsi_hdr),
- iscsi_tcp_hdr_recv_done, NULL);
-}
-
-/*
- * Handle incoming reply to any other type of command
- */
-static int
-iscsi_tcp_data_recv_done(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_segment *segment)
-{
- struct iscsi_conn *conn = tcp_conn->iscsi_conn;
- int rc = 0;
-
- if (!iscsi_tcp_dgst_verify(tcp_conn, segment))
- return ISCSI_ERR_DATA_DGST;
-
- rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr,
- conn->data, tcp_conn->in.datalen);
- if (rc)
- return rc;
-
- iscsi_tcp_hdr_recv_prep(tcp_conn);
- return 0;
-}
-
-static void
-iscsi_tcp_data_recv_prep(struct iscsi_tcp_conn *tcp_conn)
-{
- struct iscsi_conn *conn = tcp_conn->iscsi_conn;
- struct hash_desc *rx_hash = NULL;
-
- if (conn->datadgst_en)
- rx_hash = &tcp_conn->rx_hash;
-
- iscsi_segment_init_linear(&tcp_conn->in.segment,
- conn->data, tcp_conn->in.datalen,
- iscsi_tcp_data_recv_done, rx_hash);
-}
-
-/*
- * must be called with session lock
- */
-static void
-iscsi_tcp_cleanup_task(struct iscsi_conn *conn, struct iscsi_task *task)
-{
- struct iscsi_tcp_task *tcp_task = task->dd_data;
- struct iscsi_r2t_info *r2t;
-
- /* nothing to do for mgmt tasks */
- if (!task->sc)
- return;
-
- /* flush task's r2t queues */
- while (__kfifo_get(tcp_task->r2tqueue, (void*)&r2t, sizeof(void*))) {
- __kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t,
- sizeof(void*));
- debug_scsi("iscsi_tcp_cleanup_task pending r2t dropped\n");
- }
-
- r2t = tcp_task->r2t;
- if (r2t != NULL) {
- __kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t,
- sizeof(void*));
- tcp_task->r2t = NULL;
- }
-}
-
-/**
- * iscsi_data_in - SCSI Data-In Response processing
- * @conn: iscsi connection
- * @task: scsi command task
- **/
-static int
-iscsi_data_in(struct iscsi_conn *conn, struct iscsi_task *task)
-{
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct iscsi_tcp_task *tcp_task = task->dd_data;
- struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr;
- int datasn = be32_to_cpu(rhdr->datasn);
- unsigned total_in_length = scsi_in(task->sc)->length;
-
- iscsi_update_cmdsn(conn->session, (struct iscsi_nopin*)rhdr);
- if (tcp_conn->in.datalen == 0)
- return 0;
-
- if (tcp_task->exp_datasn != datasn) {
- debug_tcp("%s: task->exp_datasn(%d) != rhdr->datasn(%d)\n",
- __func__, tcp_task->exp_datasn, datasn);
- return ISCSI_ERR_DATASN;
- }
-
- tcp_task->exp_datasn++;
-
- tcp_task->data_offset = be32_to_cpu(rhdr->offset);
- if (tcp_task->data_offset + tcp_conn->in.datalen > total_in_length) {
- debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n",
- __func__, tcp_task->data_offset,
- tcp_conn->in.datalen, total_in_length);
- return ISCSI_ERR_DATA_OFFSET;
- }
-
- conn->datain_pdus_cnt++;
- return 0;
-}
-
-/**
- * iscsi_solicit_data_init - initialize first Data-Out
- * @conn: iscsi connection
- * @task: 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_task *task,
- struct iscsi_r2t_info *r2t)
-{
- struct iscsi_data *hdr;
-
- 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, task->hdr->lun, sizeof(hdr->lun));
- hdr->itt = task->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_r2t_rsp - iSCSI R2T Response processing
- * @conn: iscsi connection
- * @task: scsi command task
- **/
-static int
-iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_task *task)
-{
- struct iscsi_r2t_info *r2t;
- struct iscsi_session *session = conn->session;
- struct iscsi_tcp_task *tcp_task = task->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) {
- iscsi_conn_printk(KERN_ERR, conn,
- "invalid R2t with datalen %d\n",
- tcp_conn->in.datalen);
- return ISCSI_ERR_DATALEN;
- }
-
- if (tcp_task->exp_datasn != r2tsn){
- debug_tcp("%s: task->exp_datasn(%d) != rhdr->r2tsn(%d)\n",
- __func__, tcp_task->exp_datasn, r2tsn);
- return ISCSI_ERR_R2TSN;
- }
-
- /* fill-in new R2T associated with the task */
- iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
-
- if (!task->sc || session->state != ISCSI_STATE_LOGGED_IN) {
- iscsi_conn_printk(KERN_INFO, conn,
- "dropping R2T itt %d in recovery.\n",
- task->itt);
- return 0;
- }
-
- rc = __kfifo_get(tcp_task->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) {
- iscsi_conn_printk(KERN_ERR, conn,
- "invalid R2T with zero data len\n");
- __kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t,
- sizeof(void*));
- 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 > scsi_out(task->sc)->length) {
- iscsi_conn_printk(KERN_ERR, conn,
- "invalid R2T with data len %u at offset %u "
- "and total length %d\n", r2t->data_length,
- r2t->data_offset, scsi_out(task->sc)->length);
- __kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t,
- sizeof(void*));
- return ISCSI_ERR_DATALEN;
- }
-
- r2t->ttt = rhdr->ttt; /* no flip */
- r2t->solicit_datasn = 0;
-
- iscsi_solicit_data_init(conn, task, r2t);
-
- tcp_task->exp_datasn = r2tsn + 1;
- __kfifo_put(tcp_task->r2tqueue, (void*)&r2t, sizeof(void*));
- conn->r2t_pdus_cnt++;
-
- iscsi_requeue_task(task);
- return 0;
-}
-
-/*
- * Handle incoming reply to DataIn command
- */
-static int
-iscsi_tcp_process_data_in(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_segment *segment)
-{
- struct iscsi_conn *conn = tcp_conn->iscsi_conn;
- struct iscsi_hdr *hdr = tcp_conn->in.hdr;
- int rc;
-
- if (!iscsi_tcp_dgst_verify(tcp_conn, segment))
- return ISCSI_ERR_DATA_DGST;
-
- /* check for non-exceptional status */
- if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
- rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0);
- if (rc)
- return rc;
- }
-
- iscsi_tcp_hdr_recv_prep(tcp_conn);
- return 0;
-}
-
-/**
- * iscsi_tcp_hdr_dissect - process PDU header
- * @conn: iSCSI connection
- * @hdr: PDU header
- *
- * This function analyzes the header of the PDU received,
- * and performs several sanity checks. If the PDU is accompanied
- * by data, the receive buffer is set up to copy the incoming data
- * to the correct location.
- */
-static int
-iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
-{
- int rc = 0, opcode, ahslen;
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct iscsi_task *task;
-
- /* verify PDU length */
- tcp_conn->in.datalen = ntoh24(hdr->dlength);
- if (tcp_conn->in.datalen > conn->max_recv_dlength) {
- iscsi_conn_printk(KERN_ERR, conn,
- "iscsi_tcp: datalen %d > %d\n",
- tcp_conn->in.datalen, conn->max_recv_dlength);
- return ISCSI_ERR_DATALEN;
- }
-
- /* Additional header segments. So far, we don't
- * process additional headers.
- */
- ahslen = hdr->hlength << 2;
-
- opcode = hdr->opcode & ISCSI_OPCODE_MASK;
- /* verify itt (itt encoding: age+cid+itt) */
- rc = iscsi_verify_itt(conn, hdr->itt);
- if (rc)
- return rc;
-
- debug_tcp("opcode 0x%x ahslen %d datalen %d\n",
- opcode, ahslen, tcp_conn->in.datalen);
-
- switch(opcode) {
- case ISCSI_OP_SCSI_DATA_IN:
- spin_lock(&conn->session->lock);
- task = iscsi_itt_to_ctask(conn, hdr->itt);
- if (!task)
- rc = ISCSI_ERR_BAD_ITT;
- else
- rc = iscsi_data_in(conn, task);
- if (rc) {
- spin_unlock(&conn->session->lock);
- break;
- }
-
- if (tcp_conn->in.datalen) {
- struct iscsi_tcp_task *tcp_task = task->dd_data;
- struct hash_desc *rx_hash = NULL;
- struct scsi_data_buffer *sdb = scsi_in(task->sc);
-
- /*
- * Setup copy of Data-In into the Scsi_Cmnd
- * Scatterlist case:
- * We set up the iscsi_segment to point to the next
- * scatterlist entry to copy to. As we go along,
- * we move on to the next scatterlist entry and
- * update the digest per-entry.
- */
- if (conn->datadgst_en)
- rx_hash = &tcp_conn->rx_hash;
-
- debug_tcp("iscsi_tcp_begin_data_in(%p, offset=%d, "
- "datalen=%d)\n", tcp_conn,
- tcp_task->data_offset,
- tcp_conn->in.datalen);
- rc = iscsi_segment_seek_sg(&tcp_conn->in.segment,
- sdb->table.sgl,
- sdb->table.nents,
- tcp_task->data_offset,
- tcp_conn->in.datalen,
- iscsi_tcp_process_data_in,
- rx_hash);
- spin_unlock(&conn->session->lock);
- return rc;
- }
- rc = __iscsi_complete_pdu(conn, hdr, NULL, 0);
- spin_unlock(&conn->session->lock);
- break;
- case ISCSI_OP_SCSI_CMD_RSP:
- if (tcp_conn->in.datalen) {
- iscsi_tcp_data_recv_prep(tcp_conn);
- return 0;
- }
- rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
- break;
- case ISCSI_OP_R2T:
- spin_lock(&conn->session->lock);
- task = iscsi_itt_to_ctask(conn, hdr->itt);
- if (!task)
- rc = ISCSI_ERR_BAD_ITT;
- else if (ahslen)
- rc = ISCSI_ERR_AHSLEN;
- else if (task->sc->sc_data_direction == DMA_TO_DEVICE)
- rc = iscsi_r2t_rsp(conn, task);
- else
- rc = ISCSI_ERR_PROTO;
- spin_unlock(&conn->session->lock);
- 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) {
- iscsi_conn_printk(KERN_ERR, conn,
- "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 there's data coming in with the response,
- * receive it to the connection's buffer.
- */
- if (tcp_conn->in.datalen) {
- iscsi_tcp_data_recv_prep(tcp_conn);
- return 0;
- }
- /* 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;
- }
-
- if (rc == 0) {
- /* Anything that comes with data should have
- * been handled above. */
- if (tcp_conn->in.datalen)
- return ISCSI_ERR_PROTO;
- iscsi_tcp_hdr_recv_prep(tcp_conn);
- }
-
- return rc;
-}
-
-/**
- * iscsi_tcp_hdr_recv_done - process PDU header
- *
- * This is the callback invoked when the PDU header has
- * been received. If the header is followed by additional
- * header segments, we go back for more data.
- */
-static int
-iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_segment *segment)
-{
- struct iscsi_conn *conn = tcp_conn->iscsi_conn;
- struct iscsi_hdr *hdr;