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-rw-r--r--drivers/vhost/scsi.c308
1 files changed, 212 insertions, 96 deletions
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index e9c280f55819..4f4ffa4c604e 100644
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -57,7 +57,8 @@
#define TCM_VHOST_MAX_CDB_SIZE 32
#define TCM_VHOST_DEFAULT_TAGS 256
#define TCM_VHOST_PREALLOC_SGLS 2048
-#define TCM_VHOST_PREALLOC_PAGES 2048
+#define TCM_VHOST_PREALLOC_UPAGES 2048
+#define TCM_VHOST_PREALLOC_PROT_SGLS 512
struct vhost_scsi_inflight {
/* Wait for the flush operation to finish */
@@ -79,10 +80,12 @@ struct tcm_vhost_cmd {
u64 tvc_tag;
/* The number of scatterlists associated with this cmd */
u32 tvc_sgl_count;
+ u32 tvc_prot_sgl_count;
/* Saved unpacked SCSI LUN for tcm_vhost_submission_work() */
u32 tvc_lun;
/* Pointer to the SGL formatted memory from virtio-scsi */
struct scatterlist *tvc_sgl;
+ struct scatterlist *tvc_prot_sgl;
struct page **tvc_upages;
/* Pointer to response */
struct virtio_scsi_cmd_resp __user *tvc_resp;
@@ -166,7 +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
@@ -456,12 +460,16 @@ static void tcm_vhost_release_cmd(struct se_cmd *se_cmd)
struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd,
struct tcm_vhost_cmd, tvc_se_cmd);
struct se_session *se_sess = se_cmd->se_sess;
+ int i;
if (tv_cmd->tvc_sgl_count) {
- u32 i;
for (i = 0; i < tv_cmd->tvc_sgl_count; i++)
put_page(sg_page(&tv_cmd->tvc_sgl[i]));
}
+ if (tv_cmd->tvc_prot_sgl_count) {
+ for (i = 0; i < tv_cmd->tvc_prot_sgl_count; i++)
+ put_page(sg_page(&tv_cmd->tvc_prot_sgl[i]));
+ }
tcm_vhost_put_inflight(tv_cmd->inflight);
percpu_ida_free(&se_sess->sess_tag_pool, se_cmd->map_tag);
@@ -713,16 +721,14 @@ 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;
struct se_session *se_sess;
- struct scatterlist *sg;
+ struct scatterlist *sg, *prot_sg;
struct page **pages;
int tag;
@@ -741,19 +747,24 @@ vhost_scsi_get_tag(struct vhost_virtqueue *vq,
cmd = &((struct tcm_vhost_cmd *)se_sess->sess_cmd_map)[tag];
sg = cmd->tvc_sgl;
+ prot_sg = cmd->tvc_prot_sgl;
pages = cmd->tvc_upages;
memset(cmd, 0, sizeof(struct tcm_vhost_cmd));
cmd->tvc_sgl = sg;
+ 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;
}
@@ -767,35 +778,28 @@ vhost_scsi_map_to_sgl(struct tcm_vhost_cmd *tv_cmd,
struct scatterlist *sgl,
unsigned int sgl_count,
struct iovec *iov,
- int write)
+ struct page **pages,
+ bool write)
{
unsigned int npages = 0, pages_nr, offset, nbytes;
struct scatterlist *sg = sgl;
void __user *ptr = iov->iov_base;
size_t len = iov->iov_len;
- struct page **pages;
int ret, i;
- if (sgl_count > TCM_VHOST_PREALLOC_SGLS) {
- pr_err("vhost_scsi_map_to_sgl() psgl_count: %u greater than"
- " preallocated TCM_VHOST_PREALLOC_SGLS: %u\n",
- sgl_count, TCM_VHOST_PREALLOC_SGLS);
- return -ENOBUFS;
- }
-
pages_nr = iov_num_pages(iov);
- if (pages_nr > sgl_count)
+ if (pages_nr > sgl_count) {
+ pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than"
+ " sgl_count: %u\n", pages_nr, sgl_count);
return -ENOBUFS;
-
- if (pages_nr > TCM_VHOST_PREALLOC_PAGES) {
+ }
+ if (pages_nr > TCM_VHOST_PREALLOC_UPAGES) {
pr_err("vhost_scsi_map_to_sgl() pages_nr: %u greater than"
- " preallocated TCM_VHOST_PREALLOC_PAGES: %u\n",
- pages_nr, TCM_VHOST_PREALLOC_PAGES);
+ " preallocated TCM_VHOST_PREALLOC_UPAGES: %u\n",
+ pages_nr, TCM_VHOST_PREALLOC_UPAGES);
return -ENOBUFS;
}
- pages = tv_cmd->tvc_upages;
-
ret = get_user_pages_fast((unsigned long)ptr, pages_nr, write, pages);
/* No pages were pinned */
if (ret < 0)
@@ -825,33 +829,32 @@ out:
static int
vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *cmd,
struct iovec *iov,
- unsigned int niov,
- int write)
+ int niov,
+ bool write)
{
- int ret;
- unsigned int i;
- u32 sgl_count;
- struct scatterlist *sg;
+ struct scatterlist *sg = cmd->tvc_sgl;
+ unsigned int sgl_count = 0;
+ int ret, i;
- /*
- * Find out how long sglist needs to be
- */
- sgl_count = 0;
for (i = 0; i < niov; i++)
sgl_count += iov_num_pages(&iov[i]);
- /* TODO overflow checking */
+ if (sgl_count > TCM_VHOST_PREALLOC_SGLS) {
+ pr_err("vhost_scsi_map_iov_to_sgl() sgl_count: %u greater than"
+ " preallocated TCM_VHOST_PREALLOC_SGLS: %u\n",
+ sgl_count, TCM_VHOST_PREALLOC_SGLS);
+ return -ENOBUFS;
+ }
- sg = cmd->tvc_sgl;
pr_debug("%s sg %p sgl_count %u\n", __func__, sg, sgl_count);
sg_init_table(sg, sgl_count);
-
cmd->tvc_sgl_count = sgl_count;
- pr_debug("Mapping %u iovecs for %u pages\n", niov, sgl_count);
+ pr_debug("Mapping iovec %p for %u pages\n", &iov[0], sgl_count);
+
for (i = 0; i < niov; i++) {
ret = vhost_scsi_map_to_sgl(cmd, sg, sgl_count, &iov[i],
- write);
+ cmd->tvc_upages, write);
if (ret < 0) {
for (i = 0; i < cmd->tvc_sgl_count; i++)
put_page(sg_page(&cmd->tvc_sgl[i]));
@@ -859,31 +862,70 @@ vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *cmd,
cmd->tvc_sgl_count = 0;
return ret;
}
-
sg += ret;
sgl_count -= ret;
}
return 0;
}
+static int
+vhost_scsi_map_iov_to_prot(struct tcm_vhost_cmd *cmd,
+ struct iovec *iov,
+ int niov,
+ bool write)
+{
+ struct scatterlist *prot_sg = cmd->tvc_prot_sgl;
+ unsigned int prot_sgl_count = 0;
+ int ret, i;
+
+ for (i = 0; i < niov; i++)
+ prot_sgl_count += iov_num_pages(&iov[i]);
+
+ if (prot_sgl_count > TCM_VHOST_PREALLOC_PROT_SGLS) {
+ pr_err("vhost_scsi_map_iov_to_prot() sgl_count: %u greater than"
+ " preallocated TCM_VHOST_PREALLOC_PROT_SGLS: %u\n",
+ prot_sgl_count, TCM_VHOST_PREALLOC_PROT_SGLS);
+ return -ENOBUFS;
+ }
+
+ pr_debug("%s prot_sg %p prot_sgl_count %u\n", __func__,
+ prot_sg, prot_sgl_count);
+ sg_init_table(prot_sg, prot_sgl_count);
+ cmd->tvc_prot_sgl_count = prot_sgl_count;
+
+ for (i = 0; i < niov; i++) {
+ ret = vhost_scsi_map_to_sgl(cmd, prot_sg, prot_sgl_count, &iov[i],
+ cmd->tvc_upages, write);
+ if (ret < 0) {
+ for (i = 0; i < cmd->tvc_prot_sgl_count; i++)
+ put_page(sg_page(&cmd->tvc_prot_sgl[i]));
+
+ cmd->tvc_prot_sgl_count = 0;
+ return ret;
+ }
+ prot_sg += ret;
+ prot_sgl_count -= ret;
+ }
+ return 0;
+}
+
static void tcm_vhost_submission_work(struct work_struct *work)
{
struct tcm_vhost_cmd *cmd =
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;
}
@@ -894,7 +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);
@@ -926,12 +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);
/*
@@ -962,7 +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;
@@ -992,29 +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 (vhost_has_feature(vq, 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)) {
@@ -1022,17 +1079,79 @@ 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,
- exp_data_len, data_direction);
+ cmd = vhost_scsi_get_tag(vq, tpg, cdb, tag, lun, task_attr,
+ exp_data_len + prot_bytes,
+ 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);
@@ -1040,40 +1159,28 @@ 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
@@ -1716,6 +1823,7 @@ static void tcm_vhost_free_cmd_map_res(struct tcm_vhost_nexus *nexus,
tv_cmd = &((struct tcm_vhost_cmd *)se_sess->sess_cmd_map)[i];
kfree(tv_cmd->tvc_sgl);
+ kfree(tv_cmd->tvc_prot_sgl);
kfree(tv_cmd->tvc_upages);
}
}
@@ -1750,7 +1858,7 @@ 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_DIN_PASS | TARGET_PROT_DOUT_PASS);
if (IS_ERR(tv_nexus->tvn_se_sess)) {
mutex_unlock(&tpg->tv_tpg_mutex);
kfree(tv_nexus);
@@ -1769,12 +1877,20 @@ static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tpg,
}
tv_cmd->tvc_upages = kzalloc(sizeof(struct page *) *
- TCM_VHOST_PREALLOC_PAGES, GFP_KERNEL);
+ TCM_VHOST_PREALLOC_UPAGES, GFP_KERNEL);
if (!tv_cmd->tvc_upages) {
mutex_unlock(&tpg->tv_tpg_mutex);
pr_err("Unable to allocate tv_cmd->tvc_upages\n");
goto out;
}
+
+ tv_cmd->tvc_prot_sgl = kzalloc(sizeof(struct scatterlist) *
+ TCM_VHOST_PREALLOC_PROT_SGLS, GFP_KERNEL);
+ if (!tv_cmd->tvc_prot_sgl) {
+ mutex_unlock(&tpg->tv_tpg_mutex);
+ pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
+ goto out;
+ }
}
/*
* Since we are running in 'demo mode' this call with generate a
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-05-05 18:33:14 +0000