From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
With the new ANY_LAYOUT logic in place for vhost_scsi_handle_vqal(),
there is no longer a reason to keep around the legacy code with
!ANY_LAYOUT assumptions.
Go ahead and drop the pre virtio 1.0 logic in vhost_scsi_handle_vq()
and associated helpers.
Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
---
drivers/vhost/scsi.c | 340 +--------------------------------------------------
1 file changed, 1 insertion(+), 339 deletions(-)
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index c25fdd7..9af93d0 100644
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -830,93 +830,6 @@ out:
}
static int
-vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *cmd,
- struct iovec *iov,
- int niov,
- bool write)
-{
- struct scatterlist *sg = cmd->tvc_sgl;
- unsigned int sgl_count = 0;
- int ret, i;
-
- for (i = 0; i < niov; i++)
- sgl_count += iov_num_pages(iov[i].iov_base, iov[i].iov_len);
-
- 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;
- }
-
- 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 iovec %p for %u pages\n", &iov[0], sgl_count);
-
- for (i = 0; i < niov; i++) {
- ret = vhost_scsi_map_to_sgl(cmd, iov[i].iov_base, iov[i].iov_len,
- sg, write);
- if (ret < 0) {
- for (i = 0; i < cmd->tvc_sgl_count; i++) {
- struct page *page = sg_page(&cmd->tvc_sgl[i]);
- if (page)
- put_page(page);
- }
- 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].iov_base, iov[i].iov_len);
-
- 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, iov[i].iov_base, iov[i].iov_len,
- prot_sg, write);
- if (ret < 0) {
- for (i = 0; i < cmd->tvc_prot_sgl_count; i++) {
- struct page *page = sg_page(&cmd->tvc_prot_sgl[i]);
- if (page)
- put_page(page);
- }
- cmd->tvc_prot_sgl_count = 0;
- return ret;
- }
- prot_sg += ret;
- prot_sgl_count -= ret;
- }
- return 0;
-}
-
-static int
vhost_scsi_calc_sgls(struct iov_iter *iter, size_t bytes, int max_sgls)
{
int sgl_count = 0;
@@ -1323,254 +1236,6 @@ out:
mutex_unlock(&vq->mutex);
}
-static void
-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;
- u64 tag;
- u32 exp_data_len, data_first, data_num, data_direction, prot_first;
- unsigned out, in, i;
- 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);
- /*
- * We can handle the vq only after the endpoint is setup by calling the
- * VHOST_SCSI_SET_ENDPOINT ioctl.
- */
- vs_tpg = vq->private_data;
- if (!vs_tpg)
- goto out;
-
- vhost_disable_notify(&vs->dev, vq);
-
- for (;;) {
- head = vhost_get_vq_desc(vq, vq->iov,
- ARRAY_SIZE(vq->iov), &out, &in,
- NULL, NULL);
- pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n",
- head, out, in);
- /* On error, stop handling until the next kick. */
- if (unlikely(head < 0))
- break;
- /* Nothing new? Wait for eventfd to tell us they refilled. */
- if (head == vq->num) {
- if (unlikely(vhost_enable_notify(&vs->dev, vq))) {
- vhost_disable_notify(&vs->dev, vq);
- continue;
- }
- break;
- }
-
- /* FIXME: BIDI operation */
- if (out == 1 && in == 1) {
- data_direction = DMA_NONE;
- data_first = 0;
- data_num = 0;
- } else if (out == 1 && in > 1) {
- data_direction = DMA_FROM_DEVICE;
- data_first = out + 1;
- data_num = in - 1;
- } else if (out > 1 && in == 1) {
- data_direction = DMA_TO_DEVICE;
- data_first = 1;
- data_num = out - 1;
- } else {
- vq_err(vq, "Invalid buffer layout out: %u in: %u\n",
- out, in);
- break;
- }
-
- /*
- * Check for a sane resp buffer so we can report errors to
- * the guest.
- */
- if (unlikely(vq->iov[out].iov_len !=
- sizeof(struct virtio_scsi_cmd_resp))) {
- vq_err(vq, "Expecting virtio_scsi_cmd_resp, got %zu"
- " bytes\n", vq->iov[out].iov_len);
- break;
- }
-
- 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);
- vhost_scsi_send_bad_target(vs, vq, head, out);
- continue;
- }
- ret = memcpy_fromiovecend(req, &vq->iov[0], 0, req_size);
- if (unlikely(ret)) {
- vq_err(vq, "Faulted on virtio_scsi_cmd_req\n");
- vhost_scsi_send_bad_target(vs, vq, head, out);
- continue;
- }
-
- /* virtio-scsi spec requires byte 0 of the lun to be 1 */
- if (unlikely(*lunp != 1)) {
- vhost_scsi_send_bad_target(vs, vq, head, out);
- continue;
- }
-
- tpg = ACCESS_ONCE(vs_tpg[*target]);
-
- /* Target does not exist, fail the request */
- if (unlikely(!tpg)) {
- vhost_scsi_send_bad_target(vs, vq, head, out);
- 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");
- vhost_scsi_send_bad_target(vs, vq, head, out);
- continue;
- }
- prot_bytes = vhost32_to_cpu(vq, 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");
- vhost_scsi_send_bad_target(vs, vq, head, out);
- continue;
- }
- prot_bytes = vhost32_to_cpu(vq, 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 = vhost64_to_cpu(vq, 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 = vhost64_to_cpu(vq, 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_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);
- vhost_scsi_send_bad_target(vs, vq, head, out);
- continue;
- }
-
- 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));
- vhost_scsi_send_bad_target(vs, vq, head, out);
- continue;
- }
-
- pr_debug("Allocated tv_cmd: %p exp_data_len: %d, data_direction"
- ": %d\n", cmd, exp_data_len, data_direction);
-
- cmd->tvc_vhost = vs;
- cmd->tvc_vq = vq;
- cmd->tvc_resp_iov = &vq->iov[out];
- cmd->tvc_in_iovs = in;
-
- 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");
- tcm_vhost_release_cmd(&cmd->tvc_se_cmd);
- vhost_scsi_send_bad_target(vs, vq, head, out);
- continue;
- }
- }
- if (data_direction != DMA_NONE) {
- ret = vhost_scsi_map_iov_to_sgl(cmd,
- &vq->iov[data_first], data_niov,
- data_direction == DMA_FROM_DEVICE);
- if (unlikely(ret)) {
- vq_err(vq, "Failed to map iov to sgl\n");
- tcm_vhost_release_cmd(&cmd->tvc_se_cmd);
- vhost_scsi_send_bad_target(vs, vq, head, out);
- continue;
- }
- }
- /*
- * Save the descriptor from vhost_get_vq_desc() to be used to
- * complete the virtio-scsi request in TCM callback context via
- * tcm_vhost_queue_data_in() and tcm_vhost_queue_status()
- */
- cmd->tvc_vq_desc = head;
- /*
- * Dispatch tv_cmd descriptor for cmwq execution in process
- * context provided by tcm_vhost_workqueue. This also ensures
- * tv_cmd is executed on the same kworker CPU as this vhost
- * thread to gain positive L2 cache locality effects..
- */
- INIT_WORK(&cmd->work, tcm_vhost_submission_work);
- queue_work(tcm_vhost_workqueue, &cmd->work);
- }
-out:
- mutex_unlock(&vq->mutex);
-}
-
static void vhost_scsi_ctl_handle_kick(struct vhost_work *work)
{
pr_debug("%s: The handling func for control queue.\n", __func__);
@@ -1628,10 +1293,7 @@ static void vhost_scsi_handle_kick(struct vhost_work *work)
poll.work);
struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
- if (vhost_has_feature(vq, VIRTIO_F_ANY_LAYOUT))
- vhost_scsi_handle_vqal(vs, vq);
- else
- vhost_scsi_handle_vq(vs, vq);
+ vhost_scsi_handle_vqal(vs, vq);
}
static void vhost_scsi_flush_vq(struct vhost_scsi *vs, int index)
--
1.9.1
--
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