From: Nicholas Bellinger <n...@linux-iscsi.org>
This patch updates vhost_scsi_handle_vq() to check for the existance
of virtio_scsi_cmd_req_pi comparing vq->iov[0].iov_len in order to
calculate seperate data + protection SGLs from data_num.
Also update tcm_vhost_submission_work() to pass the pre-allocated
cmd->tvc_prot_sgl[] memory into target_submit_cmd_map_sgls(), and
update vhost_scsi_get_tag() parameters to accept scsi_tag, lun, and
task_attr.
v4 changes:
- Add prot_pto=1 in tcm_vhost_submission_work() when no PI buffer
exists (nab)
- Get rid of req + cdb pointer casts in vhost_scsi_handle_vq (mst)
- Ensure that virtio_scsi_cmd_req_pi processing happens regardless
of data_num in vhost_scsi_handle_vq (nab)
- Pass TARGET_PROT_ALL into transport_init_session_tags() (nab)
- Convert vhost_scsi_handle_vq to use memcpy_fromiovecend() (mst)
- Convert vhost_scsi_handle_vq to use pi_bytesout + pi_bytesin (nab)
v3 changes:
- Use feature_bit for determining virtio-scsi header type (Paolo)
v2 changes:
- Use virtio_scsi_cmd_req_pi instead of existing ->prio (Paolo)
- Make protection buffer come before data buffer (Paolo)
- Update vhost_scsi_get_tag() parameter usage
Cc: Michael S. Tsirkin <m...@redhat.com>
Cc: Paolo Bonzini <pbonz...@redhat.com>
Cc: Martin K. Petersen <martin.peter...@oracle.com>
Cc: Christoph Hellwig <h...@lst.de>
Cc: Hannes Reinecke <h...@suse.de>
Cc: Sagi Grimberg <sa...@dev.mellanox.co.il>
Cc: H. Peter Anvin <h...@zytor.com>
Signed-off-by: Nicholas Bellinger <n...@linux-iscsi.org>
---
drivers/vhost/scsi.c | 183 ++++++++++++++++++++++++++++++++++----------------
1 file changed, 124 insertions(+), 59 deletions(-)
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index eabcf18..17ec04b 100644
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -169,7 +169,8 @@ enum {
};
enum {
- VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG)
+ VHOST_SCSI_FEATURES = VHOST_FEATURES | (1ULL << VIRTIO_SCSI_F_HOTPLUG) |
+ (1ULL << VIRTIO_SCSI_F_T10_PI)
};
#define VHOST_SCSI_MAX_TARGET 256
@@ -720,11 +721,9 @@ static void vhost_scsi_complete_cmd_work(struct vhost_work
*work)
}
static struct tcm_vhost_cmd *
-vhost_scsi_get_tag(struct vhost_virtqueue *vq,
- struct tcm_vhost_tpg *tpg,
- struct virtio_scsi_cmd_req *v_req,
- u32 exp_data_len,
- int data_direction)
+vhost_scsi_get_tag(struct vhost_virtqueue *vq, struct tcm_vhost_tpg *tpg,
+ unsigned char *cdb, u64 scsi_tag, u16 lun, u8 task_attr,
+ u32 exp_data_len, int data_direction)
{
struct tcm_vhost_cmd *cmd;
struct tcm_vhost_nexus *tv_nexus;
@@ -756,13 +755,16 @@ vhost_scsi_get_tag(struct vhost_virtqueue *vq,
cmd->tvc_prot_sgl = prot_sg;
cmd->tvc_upages = pages;
cmd->tvc_se_cmd.map_tag = tag;
- cmd->tvc_tag = v_req->tag;
- cmd->tvc_task_attr = v_req->task_attr;
+ cmd->tvc_tag = scsi_tag;
+ cmd->tvc_lun = lun;
+ cmd->tvc_task_attr = task_attr;
cmd->tvc_exp_data_len = exp_data_len;
cmd->tvc_data_direction = data_direction;
cmd->tvc_nexus = tv_nexus;
cmd->inflight = tcm_vhost_get_inflight(vq);
+ memcpy(cmd->tvc_cdb, cdb, TCM_VHOST_MAX_CDB_SIZE);
+
return cmd;
}
@@ -913,18 +915,17 @@ static void tcm_vhost_submission_work(struct work_struct
*work)
container_of(work, struct tcm_vhost_cmd, work);
struct tcm_vhost_nexus *tv_nexus;
struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
- struct scatterlist *sg_ptr, *sg_bidi_ptr = NULL;
- int rc, sg_no_bidi = 0;
+ struct scatterlist *sg_ptr, *sg_prot_ptr = NULL;
+ int rc;
+ /* FIXME: BIDI operation */
if (cmd->tvc_sgl_count) {
sg_ptr = cmd->tvc_sgl;
-/* FIXME: Fix BIDI operation in tcm_vhost_submission_work() */
-#if 0
- if (se_cmd->se_cmd_flags & SCF_BIDI) {
- sg_bidi_ptr = NULL;
- sg_no_bidi = 0;
- }
-#endif
+
+ if (cmd->tvc_prot_sgl_count)
+ sg_prot_ptr = cmd->tvc_prot_sgl;
+ else
+ se_cmd->prot_pto = true;
} else {
sg_ptr = NULL;
}
@@ -935,7 +936,7 @@ static void tcm_vhost_submission_work(struct work_struct
*work)
cmd->tvc_lun, cmd->tvc_exp_data_len,
cmd->tvc_task_attr, cmd->tvc_data_direction,
TARGET_SCF_ACK_KREF, sg_ptr, cmd->tvc_sgl_count,
- sg_bidi_ptr, sg_no_bidi, NULL, 0);
+ NULL, 0, sg_prot_ptr, cmd->tvc_prot_sgl_count);
if (rc < 0) {
transport_send_check_condition_and_sense(se_cmd,
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
@@ -967,12 +968,18 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct
vhost_virtqueue *vq)
{
struct tcm_vhost_tpg **vs_tpg;
struct virtio_scsi_cmd_req v_req;
+ struct virtio_scsi_cmd_req_pi v_req_pi;
struct tcm_vhost_tpg *tpg;
struct tcm_vhost_cmd *cmd;
- u32 exp_data_len, data_first, data_num, data_direction;
+ u64 tag;
+ u32 exp_data_len, data_first, data_num, data_direction, prot_first;
unsigned out, in, i;
- int head, ret;
- u8 target;
+ int head, ret, data_niov, prot_niov, prot_bytes;
+ size_t req_size;
+ u16 lun;
+ u8 *target, *lunp, task_attr;
+ bool hdr_pi;
+ void *req, *cdb;
mutex_lock(&vq->mutex);
/*
@@ -1003,7 +1010,7 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct
vhost_virtqueue *vq)
break;
}
-/* FIXME: BIDI operation */
+ /* FIXME: BIDI operation */
if (out == 1 && in == 1) {
data_direction = DMA_NONE;
data_first = 0;
@@ -1033,29 +1040,38 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct
vhost_virtqueue *vq)
break;
}
- if (unlikely(vq->iov[0].iov_len != sizeof(v_req))) {
- vq_err(vq, "Expecting virtio_scsi_cmd_req, got %zu"
- " bytes\n", vq->iov[0].iov_len);
+ if (vs->dev.acked_features & VIRTIO_SCSI_F_T10_PI) {
+ req = &v_req_pi;
+ lunp = &v_req_pi.lun[0];
+ target = &v_req_pi.lun[1];
+ req_size = sizeof(v_req_pi);
+ hdr_pi = true;
+ } else {
+ req = &v_req;
+ lunp = &v_req.lun[0];
+ target = &v_req.lun[1];
+ req_size = sizeof(v_req);
+ hdr_pi = false;
+ }
+
+ if (unlikely(vq->iov[0].iov_len < req_size)) {
+ pr_err("Expecting virtio-scsi header: %zu, got %zu\n",
+ req_size, vq->iov[0].iov_len);
break;
}
- pr_debug("Calling __copy_from_user: vq->iov[0].iov_base: %p,"
- " len: %zu\n", vq->iov[0].iov_base, sizeof(v_req));
- ret = __copy_from_user(&v_req, vq->iov[0].iov_base,
- sizeof(v_req));
+ ret = memcpy_fromiovecend(req, &vq->iov[0], 0, req_size);
if (unlikely(ret)) {
vq_err(vq, "Faulted on virtio_scsi_cmd_req\n");
break;
}
/* virtio-scsi spec requires byte 0 of the lun to be 1 */
- if (unlikely(v_req.lun[0] != 1)) {
+ if (unlikely(*lunp != 1)) {
vhost_scsi_send_bad_target(vs, vq, head, out);
continue;
}
- /* Extract the tpgt */
- target = v_req.lun[1];
- tpg = ACCESS_ONCE(vs_tpg[target]);
+ tpg = ACCESS_ONCE(vs_tpg[*target]);
/* Target does not exist, fail the request */
if (unlikely(!tpg)) {
@@ -1063,17 +1079,78 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct
vhost_virtqueue *vq)
continue;
}
+ data_niov = data_num;
+ prot_niov = prot_first = prot_bytes = 0;
+ /*
+ * Determine if any protection information iovecs are preceeding
+ * the actual data payload, and adjust data_first + data_niov
+ * values accordingly for vhost_scsi_map_iov_to_sgl() below.
+ *
+ * Also extract virtio_scsi header bits for vhost_scsi_get_tag()
+ */
+ if (hdr_pi) {
+ if (v_req_pi.pi_bytesout) {
+ if (data_direction != DMA_TO_DEVICE) {
+ vq_err(vq, "Received non zero
do_pi_niov"
+ ", but wrong data_direction\n");
+ goto err_cmd;
+ }
+ prot_bytes = v_req_pi.pi_bytesout;
+ } else if (v_req_pi.pi_bytesin) {
+ if (data_direction != DMA_FROM_DEVICE) {
+ vq_err(vq, "Received non zero
di_pi_niov"
+ ", but wrong data_direction\n");
+ goto err_cmd;
+ }
+ prot_bytes = v_req_pi.pi_bytesin;
+ }
+ if (prot_bytes) {
+ int tmp = 0;
+
+ for (i = 0; i < data_num; i++) {
+ tmp += vq->iov[data_first + i].iov_len;
+ prot_niov++;
+ if (tmp >= prot_bytes)
+ break;
+ }
+ prot_first = data_first;
+ data_first += prot_niov;
+ data_niov = data_num - prot_niov;
+ }
+ tag = v_req_pi.tag;
+ task_attr = v_req_pi.task_attr;
+ cdb = &v_req_pi.cdb[0];
+ lun = ((v_req_pi.lun[2] << 8) | v_req_pi.lun[3]) &
0x3FFF;
+ } else {
+ tag = v_req.tag;
+ task_attr = v_req.task_attr;
+ cdb = &v_req.cdb[0];
+ lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
+ }
exp_data_len = 0;
- for (i = 0; i < data_num; i++)
+ for (i = 0; i < data_niov; i++)
exp_data_len += vq->iov[data_first + i].iov_len;
+ /*
+ * Check that the recieved CDB size does not exceeded our
+ * hardcoded max for vhost-scsi
+ *
+ * TODO what if cdb was too small for varlen cdb header?
+ */
+ if (unlikely(scsi_command_size(cdb) > TCM_VHOST_MAX_CDB_SIZE)) {
+ vq_err(vq, "Received SCSI CDB with command_size: %d
that"
+ " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
+ scsi_command_size(cdb), TCM_VHOST_MAX_CDB_SIZE);
+ goto err_cmd;
+ }
- cmd = vhost_scsi_get_tag(vq, tpg, &v_req,
+ cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr,
exp_data_len, data_direction);
if (IS_ERR(cmd)) {
vq_err(vq, "vhost_scsi_get_tag failed %ld\n",
PTR_ERR(cmd));
goto err_cmd;
}
+
pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
": %d\n", cmd, exp_data_len, data_direction);
@@ -1081,40 +1158,28 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct
vhost_virtqueue *vq)
cmd->tvc_vq = vq;
cmd->tvc_resp = vq->iov[out].iov_base;
- /*
- * Copy in the recieved CDB descriptor into cmd->tvc_cdb
- * that will be used by tcm_vhost_new_cmd_map() and down into
- * target_setup_cmd_from_cdb()
- */
- memcpy(cmd->tvc_cdb, v_req.cdb, TCM_VHOST_MAX_CDB_SIZE);
- /*
- * Check that the recieved CDB size does not exceeded our
- * hardcoded max for tcm_vhost
- */
- /* TODO what if cdb was too small for varlen cdb header? */
- if (unlikely(scsi_command_size(cmd->tvc_cdb) >
- TCM_VHOST_MAX_CDB_SIZE)) {
- vq_err(vq, "Received SCSI CDB with command_size: %d
that"
- " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
- scsi_command_size(cmd->tvc_cdb),
- TCM_VHOST_MAX_CDB_SIZE);
- goto err_free;
- }
- cmd->tvc_lun = ((v_req.lun[2] << 8) | v_req.lun[3]) & 0x3FFF;
-
pr_debug("vhost_scsi got command opcode: %#02x, lun: %d\n",
cmd->tvc_cdb[0], cmd->tvc_lun);
+ if (prot_niov) {
+ ret = vhost_scsi_map_iov_to_prot(cmd,
+ &vq->iov[prot_first], prot_niov,
+ data_direction == DMA_FROM_DEVICE);
+ if (unlikely(ret)) {
+ vq_err(vq, "Failed to map iov to"
+ " prot_sgl\n");
+ goto err_free;
+ }
+ }
if (data_direction != DMA_NONE) {
ret = vhost_scsi_map_iov_to_sgl(cmd,
- &vq->iov[data_first], data_num,
+ &vq->iov[data_first], data_niov,
data_direction == DMA_FROM_DEVICE);
if (unlikely(ret)) {
vq_err(vq, "Failed to map iov to sgl\n");
goto err_free;
}
}
-
/*
* Save the descriptor from vhost_get_vq_desc() to be used to
* complete the virtio-scsi request in TCM callback context via
@@ -1788,7 +1853,7 @@ static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tpg,
tv_nexus->tvn_se_sess = transport_init_session_tags(
TCM_VHOST_DEFAULT_TAGS,
sizeof(struct tcm_vhost_cmd),
- TARGET_PROT_NORMAL);
+ TARGET_PROT_ALL);
if (IS_ERR(tv_nexus->tvn_se_sess)) {
mutex_unlock(&tpg->tv_tpg_mutex);
kfree(tv_nexus);
--
1.7.10.4
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