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authorChristof Schmitt <christof.schmitt@de.ibm.com>2011-02-22 19:54:41 +0100
committerJames Bottomley <James.Bottomley@suse.de>2011-02-25 12:02:03 -0500
commit087897e36982ef8536dc9c8baed159a31517b5e6 (patch)
tree3d54e6ca8880f226cfe77c2266a47b6f3474b493 /drivers/s390/scsi/zfcp_fc.h
parentc7b279ae51942c14529bf2806685e9c658f28611 (diff)
[SCSI] zfcp: Introduce new kmem_cache for FC request and response data
A data buffer that is passed to the hardware must not cross a page boundary. zfcp uses a series of kmem_caches to align the data to not cross a page boundary. Introduce a new kmem_cache for the FC requests sent from the zfcp driver and use it for the ELS ADISC data. The goal is to migrate to the FC kmem_cache in later patches and remove the request specific kmem_caches. Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/s390/scsi/zfcp_fc.h')
-rw-r--r--drivers/s390/scsi/zfcp_fc.h27
1 files changed, 15 insertions, 12 deletions
diff --git a/drivers/s390/scsi/zfcp_fc.h b/drivers/s390/scsi/zfcp_fc.h
index b464ae01086c..4351b4e81b3c 100644
--- a/drivers/s390/scsi/zfcp_fc.h
+++ b/drivers/s390/scsi/zfcp_fc.h
@@ -123,19 +123,22 @@ struct zfcp_fc_gpn_ft {
};
/**
- * struct zfcp_fc_els_adisc - everything required in zfcp for issuing ELS ADISC
- * @els: data required for issuing els fsf command
- * @req: scatterlist entry for ELS ADISC request
- * @resp: scatterlist entry for ELS ADISC response
- * @adisc_req: ELS ADISC request data
- * @adisc_resp: ELS ADISC response data
+ * struct zfcp_fc_req - Container for FC ELS and CT requests sent from zfcp
+ * @ct_els: data required for issuing fsf command
+ * @sg_req: scatterlist entry for request data
+ * @sg_rsp: scatterlist entry for response data
+ * @u: request specific data
*/
-struct zfcp_fc_els_adisc {
- struct zfcp_fsf_ct_els els;
- struct scatterlist req;
- struct scatterlist resp;
- struct fc_els_adisc adisc_req;
- struct fc_els_adisc adisc_resp;
+struct zfcp_fc_req {
+ struct zfcp_fsf_ct_els ct_els;
+ struct scatterlist sg_req;
+ struct scatterlist sg_rsp;
+ union {
+ struct {
+ struct fc_els_adisc req;
+ struct fc_els_adisc rsp;
+ } adisc;
+ } u;
};
/**