[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>
diff --git a/drivers/s390/scsi/zfcp_fc.c b/drivers/s390/scsi/zfcp_fc.c
index 30cf91a..e020dec 100644
--- a/drivers/s390/scsi/zfcp_fc.c
+++ b/drivers/s390/scsi/zfcp_fc.c
@@ -16,6 +16,8 @@
#include "zfcp_ext.h"
#include "zfcp_fc.h"
+struct kmem_cache *zfcp_fc_req_cache;
+
static u32 zfcp_fc_rscn_range_mask[] = {
[ELS_ADDR_FMT_PORT] = 0xFFFFFF,
[ELS_ADDR_FMT_AREA] = 0xFFFF00,
@@ -419,11 +421,11 @@
static void zfcp_fc_adisc_handler(void *data)
{
- struct zfcp_fc_els_adisc *adisc = data;
- struct zfcp_port *port = adisc->els.port;
- struct fc_els_adisc *adisc_resp = &adisc->adisc_resp;
+ struct zfcp_fc_req *fc_req = data;
+ struct zfcp_port *port = fc_req->ct_els.port;
+ struct fc_els_adisc *adisc_resp = &fc_req->u.adisc.rsp;
- if (adisc->els.status) {
+ if (fc_req->ct_els.status) {
/* request rejected or timed out */
zfcp_erp_port_forced_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
"fcadh_1");
@@ -445,42 +447,42 @@
out:
atomic_clear_mask(ZFCP_STATUS_PORT_LINK_TEST, &port->status);
put_device(&port->dev);
- kmem_cache_free(zfcp_data.adisc_cache, adisc);
+ kmem_cache_free(zfcp_fc_req_cache, fc_req);
}
static int zfcp_fc_adisc(struct zfcp_port *port)
{
- struct zfcp_fc_els_adisc *adisc;
+ struct zfcp_fc_req *fc_req;
struct zfcp_adapter *adapter = port->adapter;
+ struct Scsi_Host *shost = adapter->scsi_host;
int ret;
- adisc = kmem_cache_zalloc(zfcp_data.adisc_cache, GFP_ATOMIC);
- if (!adisc)
+ fc_req = kmem_cache_zalloc(zfcp_fc_req_cache, GFP_ATOMIC);
+ if (!fc_req)
return -ENOMEM;
- adisc->els.port = port;
- adisc->els.req = &adisc->req;
- adisc->els.resp = &adisc->resp;
- sg_init_one(adisc->els.req, &adisc->adisc_req,
+ fc_req->ct_els.port = port;
+ fc_req->ct_els.req = &fc_req->sg_req;
+ fc_req->ct_els.resp = &fc_req->sg_rsp;
+ sg_init_one(&fc_req->sg_req, &fc_req->u.adisc.req,
sizeof(struct fc_els_adisc));
- sg_init_one(adisc->els.resp, &adisc->adisc_resp,
+ sg_init_one(&fc_req->sg_rsp, &fc_req->u.adisc.rsp,
sizeof(struct fc_els_adisc));
- adisc->els.handler = zfcp_fc_adisc_handler;
- adisc->els.handler_data = adisc;
+ fc_req->ct_els.handler = zfcp_fc_adisc_handler;
+ fc_req->ct_els.handler_data = fc_req;
/* acc. to FC-FS, hard_nport_id in ADISC should not be set for ports
without FC-AL-2 capability, so we don't set it */
- adisc->adisc_req.adisc_wwpn = fc_host_port_name(adapter->scsi_host);
- adisc->adisc_req.adisc_wwnn = fc_host_node_name(adapter->scsi_host);
- adisc->adisc_req.adisc_cmd = ELS_ADISC;
- hton24(adisc->adisc_req.adisc_port_id,
- fc_host_port_id(adapter->scsi_host));
+ fc_req->u.adisc.req.adisc_wwpn = fc_host_port_name(shost);
+ fc_req->u.adisc.req.adisc_wwnn = fc_host_node_name(shost);
+ fc_req->u.adisc.req.adisc_cmd = ELS_ADISC;
+ hton24(fc_req->u.adisc.req.adisc_port_id, fc_host_port_id(shost));
- ret = zfcp_fsf_send_els(adapter, port->d_id, &adisc->els,
+ ret = zfcp_fsf_send_els(adapter, port->d_id, &fc_req->ct_els,
ZFCP_FC_CTELS_TMO);
if (ret)
- kmem_cache_free(zfcp_data.adisc_cache, adisc);
+ kmem_cache_free(zfcp_fc_req_cache, fc_req);
return ret;
}