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libiscsi, iser: Adjust data_length to include protection information
In case protection information exists over the wire iscsi header data length is required to include it. Use protection information aware scsi helpers to set the correct transfer length. In order to avoid breakage, remove iser transfer length checks for each task as they are not always true and somewhat redundant anyway. Signed-off-by: Sagi Grimberg <sagig@mellanox.com> Reviewed-by: Mike Christie <michaelc@cs.wisc.edu> Acked-by: Mike Christie <michaelc@cs.wisc.edu> Cc: stable@vger.kernel.org # 3.15+ Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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8846bab180
commit
d77e65350f
2 changed files with 19 additions and 33 deletions
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@ -41,11 +41,11 @@
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#include "iscsi_iser.h"
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/* Register user buffer memory and initialize passive rdma
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* dto descriptor. Total data size is stored in
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* iser_task->data[ISER_DIR_IN].data_len
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* dto descriptor. Data size is stored in
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* task->data[ISER_DIR_IN].data_len, Protection size
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* os stored in task->prot[ISER_DIR_IN].data_len
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*/
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static int iser_prepare_read_cmd(struct iscsi_task *task,
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unsigned int edtl)
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static int iser_prepare_read_cmd(struct iscsi_task *task)
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{
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struct iscsi_iser_task *iser_task = task->dd_data;
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@ -73,14 +73,6 @@ static int iser_prepare_read_cmd(struct iscsi_task *task,
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return err;
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}
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if (edtl > iser_task->data[ISER_DIR_IN].data_len) {
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iser_err("Total data length: %ld, less than EDTL: "
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"%d, in READ cmd BHS itt: %d, conn: 0x%p\n",
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iser_task->data[ISER_DIR_IN].data_len, edtl,
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task->itt, iser_task->ib_conn);
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return -EINVAL;
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}
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err = device->iser_reg_rdma_mem(iser_task, ISER_DIR_IN);
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if (err) {
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iser_err("Failed to set up Data-IN RDMA\n");
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@ -100,8 +92,9 @@ static int iser_prepare_read_cmd(struct iscsi_task *task,
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}
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/* Register user buffer memory and initialize passive rdma
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* dto descriptor. Total data size is stored in
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* task->data[ISER_DIR_OUT].data_len
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* dto descriptor. Data size is stored in
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* task->data[ISER_DIR_OUT].data_len, Protection size
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* is stored at task->prot[ISER_DIR_OUT].data_len
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*/
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static int
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iser_prepare_write_cmd(struct iscsi_task *task,
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@ -135,14 +128,6 @@ iser_prepare_write_cmd(struct iscsi_task *task,
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return err;
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}
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if (edtl > iser_task->data[ISER_DIR_OUT].data_len) {
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iser_err("Total data length: %ld, less than EDTL: %d, "
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"in WRITE cmd BHS itt: %d, conn: 0x%p\n",
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iser_task->data[ISER_DIR_OUT].data_len,
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edtl, task->itt, task->conn);
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return -EINVAL;
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}
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err = device->iser_reg_rdma_mem(iser_task, ISER_DIR_OUT);
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if (err != 0) {
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iser_err("Failed to register write cmd RDMA mem\n");
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@ -417,11 +402,12 @@ int iser_send_command(struct iscsi_conn *conn,
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if (scsi_prot_sg_count(sc)) {
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prot_buf->buf = scsi_prot_sglist(sc);
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prot_buf->size = scsi_prot_sg_count(sc);
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prot_buf->data_len = sc->prot_sdb->length;
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prot_buf->data_len = data_buf->data_len >>
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ilog2(sc->device->sector_size) * 8;
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}
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if (hdr->flags & ISCSI_FLAG_CMD_READ) {
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err = iser_prepare_read_cmd(task, edtl);
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err = iser_prepare_read_cmd(task);
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if (err)
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goto send_command_error;
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}
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@ -338,7 +338,7 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
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struct iscsi_session *session = conn->session;
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struct scsi_cmnd *sc = task->sc;
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struct iscsi_scsi_req *hdr;
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unsigned hdrlength, cmd_len;
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unsigned hdrlength, cmd_len, transfer_length;
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itt_t itt;
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int rc;
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@ -391,11 +391,11 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
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if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
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task->protected = true;
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transfer_length = scsi_transfer_length(sc);
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hdr->data_length = cpu_to_be32(transfer_length);
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if (sc->sc_data_direction == DMA_TO_DEVICE) {
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unsigned out_len = scsi_out(sc)->length;
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struct iscsi_r2t_info *r2t = &task->unsol_r2t;
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hdr->data_length = cpu_to_be32(out_len);
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hdr->flags |= ISCSI_FLAG_CMD_WRITE;
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/*
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* Write counters:
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@ -414,18 +414,19 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
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memset(r2t, 0, sizeof(*r2t));
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if (session->imm_data_en) {
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if (out_len >= session->first_burst)
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if (transfer_length >= session->first_burst)
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task->imm_count = min(session->first_burst,
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conn->max_xmit_dlength);
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else
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task->imm_count = min(out_len,
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conn->max_xmit_dlength);
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task->imm_count = min(transfer_length,
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conn->max_xmit_dlength);
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hton24(hdr->dlength, task->imm_count);
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} else
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zero_data(hdr->dlength);
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if (!session->initial_r2t_en) {
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r2t->data_length = min(session->first_burst, out_len) -
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r2t->data_length = min(session->first_burst,
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transfer_length) -
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task->imm_count;
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r2t->data_offset = task->imm_count;
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r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
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@ -438,7 +439,6 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
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} else {
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hdr->flags |= ISCSI_FLAG_CMD_FINAL;
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zero_data(hdr->dlength);
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hdr->data_length = cpu_to_be32(scsi_in(sc)->length);
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if (sc->sc_data_direction == DMA_FROM_DEVICE)
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hdr->flags |= ISCSI_FLAG_CMD_READ;
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@ -466,7 +466,7 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
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scsi_bidi_cmnd(sc) ? "bidirectional" :
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sc->sc_data_direction == DMA_TO_DEVICE ?
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"write" : "read", conn->id, sc, sc->cmnd[0],
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task->itt, scsi_bufflen(sc),
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task->itt, transfer_length,
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scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
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session->cmdsn,
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session->max_cmdsn - session->exp_cmdsn + 1);
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