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| author | Sagi Grimberg <sagig@mellanox.com> | 2015-10-13 19:12:58 +0300 |
|---|---|---|
| committer | Doug Ledford <dledford@redhat.com> | 2015-10-28 12:26:06 -0400 |
| commit | dd0107a08996c0ab8cac2b98ddbed5313e118e81 (patch) | |
| tree | 1248e196a4cfc38d3c06b736171249e395e19fe7 /drivers/infiniband/ulp/iser/iscsi_iser.c | |
| parent | 6c760b3dd576329e776b353f2eaefbe2034361b9 (diff) | |
| download | linux-stable-dd0107a08996c0ab8cac2b98ddbed5313e118e81.tar.gz linux-stable-dd0107a08996c0ab8cac2b98ddbed5313e118e81.tar.bz2 linux-stable-dd0107a08996c0ab8cac2b98ddbed5313e118e81.zip | |
IB/iser: set block queue_virt_boundary
The block layer can reliably guarantee that SG lists won't
contain gaps (page unaligned) if a driver set the queue
virt_boundary.
With this setting the block layer will:
- refuse merges if bios are not aligned to the virtual boundary
- split bios/requests that are not aligned to the virtual boundary
- or, bounce buffer SG_IOs that are not aligned to the virtual boundary
Since iser is working in 4K page size, set the virt_boundary to
4K pages. With this setting, we can now safely remove the bounce
buffering logic in iser.
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/infiniband/ulp/iser/iscsi_iser.c')
| -rw-r--r-- | drivers/infiniband/ulp/iser/iscsi_iser.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c index 3d0bdb87a653..2ea0a14125e8 100644 --- a/drivers/infiniband/ulp/iser/iscsi_iser.c +++ b/drivers/infiniband/ulp/iser/iscsi_iser.c @@ -762,9 +762,7 @@ iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *s stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; - stats->custom_length = 1; - strcpy(stats->custom[0].desc, "fmr_unalign_cnt"); - stats->custom[0].value = conn->fmr_unalign_cnt; + stats->custom_length = 0; } static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, @@ -969,6 +967,13 @@ static umode_t iser_attr_is_visible(int param_type, int param) return 0; } +static int iscsi_iser_slave_alloc(struct scsi_device *sdev) +{ + blk_queue_virt_boundary(sdev->request_queue, ~MASK_4K); + + return 0; +} + static struct scsi_host_template iscsi_iser_sht = { .module = THIS_MODULE, .name = "iSCSI Initiator over iSER", @@ -982,6 +987,7 @@ static struct scsi_host_template iscsi_iser_sht = { .eh_target_reset_handler = iscsi_eh_recover_target, .target_alloc = iscsi_target_alloc, .use_clustering = DISABLE_CLUSTERING, + .slave_alloc = iscsi_iser_slave_alloc, .proc_name = "iscsi_iser", .this_id = -1, .track_queue_depth = 1, |