[SCSI] fcoe, libfc: adds offload EM per eth device with only single xid range per EM
Updates fcoe_em_config to allocate a single instance of sharable offload
EM for supported lp->lro_xid per eth device, and then share this EM
for subsequently more lports creation on same eth device (e.g when using
VLAN).
Adds tiny fcoe_oem_match function for offload EM to return true for read
types IO to have read IO exchanges allocated from offload shared EM.
Removes fc_em_alloc_xid function completely which was needed to manage
two xid ranges within a EM, this is not needed any more with allocation
of separate sharable offload EM per eth device. Instead this patch adds
simple xid allocation logic to manage single xid range.
Adds fc_exch_em_alloc with mp->next_xid as cursor to allocate new xid
from single xid range of EM, uses mp->next_xid instead removed mp->last_xid
which slightly increase probability of finding empty xid on exch allocation.
Removes restriction of not allowing use of xid zero along with changing
two xid range change to single xid range.
Makes fc_fcp_ddp_setup calling conditional to only xid allocated from
shared offload EM.
Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/fcoe/fcoe.h b/drivers/scsi/fcoe/fcoe.h
index 0d724fa..6905efc 100644
--- a/drivers/scsi/fcoe/fcoe.h
+++ b/drivers/scsi/fcoe/fcoe.h
@@ -37,7 +37,7 @@
#define FCOE_MAX_OUTSTANDING_COMMANDS 1024
-#define FCOE_MIN_XID 0x0001 /* the min xid supported by fcoe_sw */
+#define FCOE_MIN_XID 0x0000 /* the min xid supported by fcoe_sw */
#define FCOE_MAX_XID 0x07ef /* the max xid supported by fcoe_sw */
unsigned int fcoe_debug_logging;
@@ -81,6 +81,7 @@
struct list_head list;
struct net_device *real_dev;
struct net_device *phys_dev; /* device with ethtool_ops */
+ struct fc_exch_mgr *oem; /* offload exchange manger */
struct packet_type fcoe_packet_type;
struct packet_type fip_packet_type;
struct sk_buff_head fcoe_pending_queue;