[SCSI] iscsi_tcp, libiscsi: initial AHS Support

  at libiscsi generic code
  - currently code assumes a storage space of pdu header is allocated
    at llds ctask and is pointed to by iscsi_cmd_task->hdr. Here I add
    a hdr_max field pertaining to that storage, and an hdr_len that
    accumulates the current use of the pdu-header.

  - Add an iscsi_next_hdr() inline which returns the next free space
    to write new Header at. Also iscsi_next_hdr() is used to retrieve
    the address at which to write the header-digest.

  - Add iscsi_add_hdr(length). What the user do is calls iscsi_next_hdr()
    for address of the new header, than calls iscsi_add_hdr(length) with
    the size of the new header. iscsi_add_hdr() will check if space is
    available and update to the new size. length must be padded according
    to standard.

  - Add 2 padding inline helpers thanks to Olaf. Current patch does not
    use them but Following patches will.
    Also moved definition of ISCSI_PAD_LEN to iscsi_proto.h which had
    PAD_WORD_LEN that was never used anywhere.

  - Let iscsi_prep_scsi_cmd_pdu() signal an Error return since now  it is
    possible that it will fail.

  - I was tired of yet again writing a "this is a digest" comment next to
    sizeof(__u32) so I defined a new ISCSI_DIGEST_SIZE. Now I don't need
    any comments. Changed all places that used sizeof(__u32) or "4" in
    connection to a digest.

  iscsi_tcp specific code
  - At struct iscsi_tcp_cmd_task allocate maximum space allowed in
    standard for all headers following the iscsi_cmd header. and mark
    it so in iscsi_tcp_session_create()
  - At iscsi_send_cmd_hdr() retrieve the correct headers size and
    write header digest at iscsi_next_hdr().

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Olaf Kirch <olaf.kirch@oracle.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

3 files changed, 54 insertions, 16 deletions

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index fd88777df28b..491845f18710 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -113,7 +113,7 @@ iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
         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 += sizeof(u32);
+        buf->sg.length += ISCSI_DIGEST_SIZE;
 }
 
 /*
@@ -220,6 +220,7 @@ static inline int
 iscsi_tcp_chunk_done(struct iscsi_chunk *chunk)
 {
         static unsigned char padbuf[ISCSI_PAD_LEN];
+        unsigned int pad;
 
         if (chunk->copied < chunk->size) {
                 iscsi_tcp_chunk_map(chunk);
@@ -243,10 +244,8 @@ iscsi_tcp_chunk_done(struct iscsi_chunk *chunk)
         }
 
         /* Do we need to handle padding? */
-        if (chunk->total_copied & (ISCSI_PAD_LEN-1)) {
-                unsigned int pad;
-
-                pad = ISCSI_PAD_LEN - (chunk->total_copied & (ISCSI_PAD_LEN-1));
+        pad = iscsi_padding(chunk->total_copied);
+        if (pad != 0) {
                 debug_tcp("consume %d pad bytes\n", pad);
                 chunk->total_size += pad;
                 chunk->size = pad;
@@ -1385,11 +1384,11 @@ iscsi_send_cmd_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
                 }
 
                 iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr,
-                                  sizeof(struct iscsi_hdr));
+                                  ctask->hdr_len);
 
                 if (conn->hdrdgst_en)
                         iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
-                                         (u8*)tcp_ctask->hdrext);
+                                         iscsi_next_hdr(ctask));
                 tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_INIT;
                 tcp_ctask->xmstate |= XMSTATE_CMD_HDR_XMIT;
         }
@@ -2176,7 +2175,8 @@ iscsi_tcp_session_create(struct iscsi_transport *iscsit,
                 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
                 struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
 
-                ctask->hdr = &tcp_ctask->hdr;
+                ctask->hdr = &tcp_ctask->hdr.cmd_hdr;
+                ctask->hdr_max = sizeof(tcp_ctask->hdr) - ISCSI_DIGEST_SIZE;
         }
 
         for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h
index f1c541151100..eb3784f949fd 100644
--- a/drivers/scsi/iscsi_tcp.h
+++ b/drivers/scsi/iscsi_tcp.h
@@ -41,7 +41,6 @@
 #define XMSTATE_IMM_HDR_INIT            0x1000
 #define XMSTATE_SOL_HDR_INIT            0x2000
 
-#define ISCSI_PAD_LEN                   4
 #define ISCSI_SG_TABLESIZE              SG_ALL
 #define ISCSI_TCP_MAX_CMD_LEN           16
 
@@ -130,14 +129,14 @@ struct iscsi_buf {
 
 struct iscsi_data_task {
         struct iscsi_data       hdr;                    /* PDU */
-        char                    hdrext[sizeof(__u32)];  /* Header-Digest */
+        char                    hdrext[ISCSI_DIGEST_SIZE];/* Header-Digest */
         struct iscsi_buf        digestbuf;              /* digest buffer */
         uint32_t                digest;                 /* data digest */
 };
 
 struct iscsi_tcp_mgmt_task {
         struct iscsi_hdr        hdr;
-        char                    hdrext[sizeof(__u32)]; /* Header-Digest */
+        char                    hdrext[ISCSI_DIGEST_SIZE]; /* Header-Digest */
         int                     xmstate;        /* mgmt xmit progress */
         struct iscsi_buf        headbuf;        /* header buffer */
         struct iscsi_buf        sendbuf;        /* in progress buffer */
@@ -159,9 +158,11 @@ struct iscsi_r2t_info {
 };
 
 struct iscsi_tcp_cmd_task {
-        struct iscsi_cmd        hdr;
-        char                    hdrext[4*sizeof(__u16)+ /* AHS */
-                                    sizeof(__u32)];     /* HeaderDigest */
+        struct iscsi_hdr_buff {
+                struct iscsi_cmd        cmd_hdr;
+                char                    hdrextbuf[ISCSI_MAX_AHS_SIZE +
+                                                  ISCSI_DIGEST_SIZE];
+        } hdr;
         char                    pad[ISCSI_PAD_LEN];
         int                     pad_count;              /* padded bytes */
         struct iscsi_buf        headbuf;                /* header buf (xmit) */
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 0beb4c620962..0d7914fd8ef3 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -37,6 +37,9 @@
 #include <scsi/scsi_transport_iscsi.h>
 #include <scsi/libiscsi.h>
 
+static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
+                         int err);
+
 struct iscsi_session *
 class_to_transport_session(struct iscsi_cls_session *cls_session)
 {
@@ -122,6 +125,20 @@ void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
 }
 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
 
+static int iscsi_add_hdr(struct iscsi_cmd_task *ctask, unsigned len)
+{
+        unsigned exp_len = ctask->hdr_len + len;
+
+        if (exp_len > ctask->hdr_max) {
+                WARN_ON(1);
+                return -EINVAL;
+        }
+
+        WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
+        ctask->hdr_len = exp_len;
+        return 0;
+}
+
 /**
  * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
  * @ctask: iscsi cmd task
@@ -129,13 +146,19 @@ EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
  * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
  * fields like dlength or final based on how much data it sends
  */
-static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
+static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
 {
         struct iscsi_conn *conn = ctask->conn;
         struct iscsi_session *session = conn->session;
         struct iscsi_cmd *hdr = ctask->hdr;
         struct scsi_cmnd *sc = ctask->sc;
+        unsigned hdrlength;
+        int rc;
 
+        ctask->hdr_len = 0;
+        rc = iscsi_add_hdr(ctask, sizeof(*hdr));
+        if (rc)
+                return rc;
         hdr->opcode = ISCSI_OP_SCSI_CMD;
         hdr->flags = ISCSI_ATTR_SIMPLE;
         int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
@@ -199,6 +222,15 @@ static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
                         hdr->flags |= ISCSI_FLAG_CMD_READ;
         }
 
+        /* calculate size of additional header segments (AHSs) */
+        hdrlength = ctask->hdr_len - sizeof(*hdr);
+
+        WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
+        hdrlength /= ISCSI_PAD_LEN;
+
+        WARN_ON(hdrlength >= 256);
+        hdr->hlength = hdrlength & 0xFF;
+
         conn->scsicmd_pdus_cnt++;
 
         debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
@@ -206,6 +238,7 @@ static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
                 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
                 conn->id, sc, sc->cmnd[0], ctask->itt, scsi_bufflen(sc),
                 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
+        return 0;
 }
 
 /**
@@ -744,7 +777,10 @@ check_mgmt:
 
                 conn->ctask = list_entry(conn->xmitqueue.next,
                                          struct iscsi_cmd_task, running);
-                iscsi_prep_scsi_cmd_pdu(conn->ctask);
+                if (iscsi_prep_scsi_cmd_pdu(conn->ctask)) {
+                        fail_command(conn, conn->ctask, DID_ABORT << 16);
+                        continue;
+                }
                 conn->session->tt->init_cmd_task(conn->ctask);
                 conn->ctask->state = ISCSI_TASK_RUNNING;
                 list_move_tail(conn->xmitqueue.next, &conn->run_list);
@@ -1534,6 +1570,7 @@ iscsi_session_setup(struct iscsi_transport *iscsit,
                 if (cmd_task_size)
                         ctask->dd_data = &ctask[1];
                 ctask->itt = cmd_i;
+                ctask->hdr_max = sizeof(struct iscsi_cmd);
                 INIT_LIST_HEAD(&ctask->running);
         }