From: Mike Christie Date: Wed, 21 May 2008 20:54:07 +0000 (-0500) Subject: [SCSI] iscsi_tcp: convert iscsi_tcp to support merged tasks X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=fbc514b4e262bc0596faae8640ebc0b9142a1cdd;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git [SCSI] iscsi_tcp: convert iscsi_tcp to support merged tasks Convert iscsi_tcp to support merged tasks. Signed-off-by: Mike Christie Signed-off-by: James Bottomley --- diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c index f2a08f7ed902..517bad160bea 100644 --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -498,11 +498,15 @@ iscsi_tcp_data_recv_prep(struct iscsi_tcp_conn *tcp_conn) * must be called with session lock */ static void -iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +iscsi_tcp_cleanup_task(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct iscsi_r2t_info *r2t; + /* nothing to do for mgmt ctasks */ + if (!ctask->sc) + return; + /* flush ctask's r2t queues */ while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, @@ -521,7 +525,7 @@ iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) /** * iscsi_data_rsp - SCSI Data-In Response processing * @conn: iscsi connection - * @ctask: scsi command task + * @ctask: scsi command ctask **/ static int iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) @@ -578,7 +582,7 @@ iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) /** * iscsi_solicit_data_init - initialize first Data-Out * @conn: iscsi connection - * @ctask: scsi command task + * @ctask: scsi command ctask * @r2t: R2T info * * Notes: @@ -620,7 +624,7 @@ iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, /** * iscsi_r2t_rsp - iSCSI R2T Response processing * @conn: iscsi connection - * @ctask: scsi command task + * @ctask: scsi command ctask **/ static int iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) @@ -646,7 +650,7 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) return ISCSI_ERR_R2TSN; } - /* fill-in new R2T associated with the task */ + /* fill-in new R2T associated with the ctask */ iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); if (!ctask->sc || session->state != ISCSI_STATE_LOGGED_IN) { @@ -769,6 +773,8 @@ iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr) ctask = iscsi_itt_to_ctask(conn, hdr->itt); if (!ctask) return ISCSI_ERR_BAD_ITT; + if (!ctask->sc) + return ISCSI_ERR_NO_SCSI_CMD; spin_lock(&conn->session->lock); rc = iscsi_data_rsp(conn, ctask); @@ -815,6 +821,8 @@ iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr) ctask = iscsi_itt_to_ctask(conn, hdr->itt); if (!ctask) return ISCSI_ERR_BAD_ITT; + if (!ctask->sc) + return ISCSI_ERR_NO_SCSI_CMD; if (ahslen) rc = ISCSI_ERR_AHSLEN; @@ -1194,7 +1202,7 @@ iscsi_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, size_t hdrlen) /* If header digest is enabled, compute the CRC and * place the digest into the same buffer. We make - * sure that both iscsi_tcp_ctask and mtask have + * sure that both iscsi_tcp_cmd_task and mctask have * sufficient room. */ if (conn->hdrdgst_en) { @@ -1269,7 +1277,7 @@ iscsi_tcp_send_linear_data_prepare(struct iscsi_conn *conn, void *data, /** * iscsi_solicit_data_cont - initialize next Data-Out * @conn: iscsi connection - * @ctask: scsi command task + * @ctask: scsi command ctask * @r2t: R2T info * @left: bytes left to transfer * @@ -1316,19 +1324,37 @@ iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, } /** - * iscsi_tcp_ctask - Initialize iSCSI SCSI_READ or SCSI_WRITE commands + * iscsi_tcp_task - Initialize iSCSI SCSI_READ or SCSI_WRITE commands * @conn: iscsi connection - * @ctask: scsi command task + * @ctask: scsi command ctask * @sc: scsi command **/ static int -iscsi_tcp_ctask_init(struct iscsi_cmd_task *ctask) +iscsi_tcp_task_init(struct iscsi_cmd_task *ctask) { struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct iscsi_conn *conn = ctask->conn; struct scsi_cmnd *sc = ctask->sc; int err; + if (!sc) { + /* + * mgmt ctasks do not have a scatterlist since they come + * in from the iscsi interface. + */ + debug_scsi("mctask deq [cid %d itt 0x%x]\n", conn->id, + ctask->itt); + + /* Prepare PDU, optionally w/ immediate data */ + iscsi_tcp_send_hdr_prep(conn, ctask->hdr, sizeof(*ctask->hdr)); + + /* If we have immediate data, attach a payload */ + if (ctask->data_count) + iscsi_tcp_send_linear_data_prepare(conn, ctask->data, + ctask->data_count); + return 0; + } + BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); tcp_ctask->sent = 0; tcp_ctask->exp_datasn = 0; @@ -1353,52 +1379,21 @@ iscsi_tcp_ctask_init(struct iscsi_cmd_task *ctask) return 0; } -/** - * 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. - **/ -static int -iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) -{ - int rc; - - /* Flush any pending data first. */ - rc = iscsi_tcp_flush(conn); - if (rc < 0) - return rc; - - if (mtask->hdr->itt == RESERVED_ITT) { - struct iscsi_session *session = conn->session; - - spin_lock_bh(&session->lock); - iscsi_free_mgmt_task(conn, mtask); - spin_unlock_bh(&session->lock); - } - - return 0; -} - /* - * iscsi_tcp_ctask_xmit - xmit normal PDU task - * @conn: iscsi connection - * @ctask: iscsi command task + * iscsi_tcp_task_xmit - xmit normal PDU ctask + * @ctask: iscsi command ctask * * We're expected to return 0 when everything was transmitted succesfully, * -EAGAIN if there's still data in the queue, or != 0 for any other kind * of error. */ static int -iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +iscsi_tcp_task_xmit(struct iscsi_cmd_task *ctask) { + struct iscsi_conn *conn = ctask->conn; struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct scsi_cmnd *sc = ctask->sc; - struct scsi_data_buffer *sdb = scsi_out(sc); + struct scsi_data_buffer *sdb; int rc = 0; flush: @@ -1407,10 +1402,18 @@ flush: if (rc < 0) return rc; + /* mgmt command */ + if (!sc) { + if (ctask->hdr->itt == RESERVED_ITT) + iscsi_put_ctask(ctask); + return 0; + } + /* Are we done already? */ if (sc->sc_data_direction != DMA_TO_DEVICE) return 0; + sdb = scsi_out(sc); if (ctask->unsol_count != 0) { struct iscsi_data *hdr = &tcp_ctask->unsol_dtask.hdr; @@ -1688,21 +1691,6 @@ free_socket: return err; } -/* called with host lock */ -static void -iscsi_tcp_mtask_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) -{ - debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id, mtask->itt); - - /* Prepare PDU, optionally w/ immediate data */ - iscsi_tcp_send_hdr_prep(conn, mtask->hdr, sizeof(*mtask->hdr)); - - /* If we have immediate data, attach a payload */ - if (mtask->data_count) - iscsi_tcp_send_linear_data_prepare(conn, mtask->data, - mtask->data_count); -} - static int iscsi_r2tpool_alloc(struct iscsi_session *session) { @@ -1710,7 +1698,7 @@ iscsi_r2tpool_alloc(struct iscsi_session *session) int cmd_i; /* - * initialize per-task: R2T pool and xmit queue + * initialize per-ctask: 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]; @@ -1880,13 +1868,12 @@ iscsi_tcp_session_create(struct Scsi_Host *shost, uint16_t cmds_max, cls_session = iscsi_session_setup(&iscsi_tcp_transport, shost, cmds_max, sizeof(struct iscsi_tcp_cmd_task), - sizeof(struct iscsi_tcp_mgmt_task), initial_cmdsn); if (!cls_session) goto remove_host; session = cls_session->dd_data; - shost->can_queue = session->cmds_max; + shost->can_queue = session->scsi_cmds_max; 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; @@ -1895,13 +1882,6 @@ iscsi_tcp_session_create(struct Scsi_Host *shost, uint16_t cmds_max, ctask->hdr_max = sizeof(tcp_ctask->hdr) - ISCSI_DIGEST_SIZE; } - 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 = (struct iscsi_hdr *) &tcp_mtask->hdr; - } - if (iscsi_r2tpool_alloc(session)) goto remove_session; return cls_session; @@ -1999,11 +1979,9 @@ static struct iscsi_transport iscsi_tcp_transport = { /* IO */ .send_pdu = iscsi_conn_send_pdu, .get_stats = iscsi_conn_get_stats, - .init_cmd_task = iscsi_tcp_ctask_init, - .init_mgmt_task = iscsi_tcp_mtask_init, - .xmit_cmd_task = iscsi_tcp_ctask_xmit, - .xmit_mgmt_task = iscsi_tcp_mtask_xmit, - .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, + .init_task = iscsi_tcp_task_init, + .xmit_task = iscsi_tcp_task_xmit, + .cleanup_task = iscsi_tcp_cleanup_task, /* recovery */ .session_recovery_timedout = iscsi_session_recovery_timedout, }; diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h index ed0b991d1e72..c9c8633c41a6 100644 --- a/drivers/scsi/iscsi_tcp.h +++ b/drivers/scsi/iscsi_tcp.h @@ -103,11 +103,6 @@ struct iscsi_data_task { char hdrext[ISCSI_DIGEST_SIZE];/* Header-Digest */ }; -struct iscsi_tcp_mgmt_task { - struct iscsi_hdr hdr; - char hdrext[ISCSI_DIGEST_SIZE]; /* Header-Digest */ -}; - struct iscsi_r2t_info { __be32 ttt; /* copied from R2T */ __be32 exp_statsn; /* copied from R2T */