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| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2014-02-22 18:08:24 -0800 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2014-06-02 12:42:01 -0700 |
| commit | b1935f687bb93b207ef690f7debc0e9921fc484f (patch) | |
| tree | 411904ec301b4f92cb3d279b1d311ff89500b1cb /drivers/vhost | |
| parent | 5a01d08217e39f3d36d3ca160361c7b019ff1598 (diff) | |
| download | linux-b1935f687bb93b207ef690f7debc0e9921fc484f.tar.gz linux-b1935f687bb93b207ef690f7debc0e9921fc484f.tar.bz2 linux-b1935f687bb93b207ef690f7debc0e9921fc484f.zip | |
vhost/scsi: Add preallocation of protection SGLs
This patch updates tcm_vhost_make_nexus() to pre-allocate per descriptor
tcm_vhost_cmd->tvc_prot_sgl[] used to expose protection SGLs from within
virtio-scsi guest memory to vhost-scsi.
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>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/vhost')
| -rw-r--r-- | drivers/vhost/scsi.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c index ae434db2d384..30402e618078 100644 --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -58,6 +58,7 @@ #define TCM_VHOST_DEFAULT_TAGS 256 #define TCM_VHOST_PREALLOC_SGLS 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 */ @@ -83,6 +84,7 @@ struct tcm_vhost_cmd { 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; @@ -722,7 +724,7 @@ vhost_scsi_get_tag(struct vhost_virtqueue *vq, 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; @@ -741,10 +743,12 @@ 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; @@ -1703,6 +1707,7 @@ 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); } } @@ -1762,6 +1767,14 @@ static int tcm_vhost_make_nexus(struct tcm_vhost_tpg *tpg, 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 |