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vhost/scsi: Add T10 PI IOV -> SGL memory mapping logic

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This patch adds vhost_scsi_map_iov_to_prot() to perform the mapping of
T10 data integrity memory between virtio iov + struct scatterlist using
get_user_pages_fast() following existing code.

As with vhost_scsi_map_iov_to_sgl(), this does sanity checks against the
total prot_sgl_count vs. pre-allocated SGLs, and loops across protection
iovs using vhost_scsi_map_to_sgl() to perform the actual memory mapping.

Also update tcm_vhost_release_cmd() to release associated tvc_prot_sgl[]
struct page.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Sagi Grimberg <sagig@dev.mellanox.co.il>
Cc: H. Peter Anvin <hpa@zytor.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2014-02-22 18:34:43 -08:00
parent b1935f687b
commit e31885dd90
1 changed files with 47 additions and 1 deletions
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48
drivers/vhost/scsi.c
View file

@ -80,6 +80,7 @@ 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 */
@ -458,12 +459,16 @@ 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);
@ -861,6 +866,47 @@ vhost_scsi_map_iov_to_sgl(struct tcm_vhost_cmd *cmd,
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 =