mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-30 08:02:30 +00:00
Code Issues Releases Wiki Activity

[SCSI] zfcp: Use unchained mode for small ct and els requests

Browse source 
The ELS ADISC and the GID_PN requests sent from zfcp fit into
unchained FSF requests. Change the FSF allocation logic to use
unchained requests whenever possible where everything fits in one
SBAL. This avoids acquiring more SBALs than necessary, especially
during zfcp recovery when things might be stalled.

Reviewed-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Christof Schmitt 2009-07-13 15:06:06 +02:00 committed by James Bottomley
parent 688a1820bd
commit 426f6059b0
1 changed files with 25 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

33
drivers/s390/scsi/zfcp_fsf.c
View file

@ -1010,6 +1010,23 @@ static void zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *req)
send_ct->handler(send_ct->handler_data);
}
static void zfcp_fsf_setup_ct_els_unchained(struct qdio_buffer_element *sbale,
struct scatterlist *sg_req,
struct scatterlist *sg_resp)
{
sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
sbale[2].addr = sg_virt(sg_req);
sbale[2].length = sg_req->length;
sbale[3].addr = sg_virt(sg_resp);
sbale[3].length = sg_resp->length;
sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
}
static int zfcp_fsf_one_sbal(struct scatterlist *sg)
{
return sg_is_last(sg) && sg->length <= PAGE_SIZE;
}
static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
struct scatterlist *sg_req,
struct scatterlist *sg_resp,
@ -1020,16 +1037,16 @@ static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
int bytes;
if (!(feat & FSF_FEATURE_ELS_CT_CHAINED_SBALS)) {
if (sg_req->length > PAGE_SIZE || sg_resp->length > PAGE_SIZE ||
!sg_is_last(sg_req) || !sg_is_last(sg_resp))
if (!zfcp_fsf_one_sbal(sg_req) || !zfcp_fsf_one_sbal(sg_resp))
return -EOPNOTSUPP;
sbale[0].flags |= SBAL_FLAGS0_TYPE_WRITE_READ;
sbale[2].addr = sg_virt(sg_req);
sbale[2].length = sg_req->length;
sbale[3].addr = sg_virt(sg_resp);
sbale[3].length = sg_resp->length;
sbale[3].flags |= SBAL_FLAGS_LAST_ENTRY;
zfcp_fsf_setup_ct_els_unchained(sbale, sg_req, sg_resp);
return 0;
}
/* use single, unchained SBAL if it can hold the request */
if (zfcp_fsf_one_sbal(sg_req) && zfcp_fsf_one_sbal(sg_resp)) {
zfcp_fsf_setup_ct_els_unchained(sbale, sg_req, sg_resp);
return 0;
}