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vhost-scsi: Allocate T10 PI structs only when enabled

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T10 PI is not a widely used feature. This has us only allocate the
structs for it if the feature has been enabled. For a common small setup
where you have 1 virtqueue and 128 commands per queue, this saves:

8MB = 32 bytes per sg * 2048 entries * 128 commands

per vhost-scsi device.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Message-Id: <20241203191705.19431-3-michael.christie@oracle.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Mike Christie
2024-12-03 13:15:09 -06:00
committed by Michael S. Tsirkin
parent 4c1f3a7d74
commit bf2d650391
1 changed files with 8 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/vhost/scsi.c
+8 -6
View File
@@ -1651,12 +1651,14 @@ static int vhost_scsi_setup_vq_cmds(struct vhost_virtqueue *vq, int max_cmds)
goto out;
}
tv_cmd->tvc_prot_sgl = kcalloc(VHOST_SCSI_PREALLOC_PROT_SGLS,
sizeof(struct scatterlist),
GFP_KERNEL);
if (!tv_cmd->tvc_prot_sgl) {
pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
goto out;
if (vhost_has_feature(vq, VIRTIO_SCSI_F_T10_PI)) {
tv_cmd->tvc_prot_sgl = kcalloc(VHOST_SCSI_PREALLOC_PROT_SGLS,
sizeof(struct scatterlist),
GFP_KERNEL);
if (!tv_cmd->tvc_prot_sgl) {
pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
goto out;
}
}
}
return 0;