[SCSI] fcoe, libfc: add get_lesb() to allow LLD to fill the link error status block...

Add a member function pointer as get_lesb to libfc_function_template so LLD
can fill the LESB based on its own statistics. For fcoe, it fills the LESB
as a fcoe_fc_els_lesb struct according to FC-BB-5.

Signed-off-by: Yi Zou <yi.zou@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
index 32298ed60614f7c030bcdc6be7944d760a316dbf..a30ffaa1222c4fa3e1eb05b0f8f780bd10d5dbe8 100644 (file)
--- a/drivers/scsi/fcoe/fcoe.c
+++ b/drivers/scsi/fcoe/fcoe.c
@@ -111,6 +111,8 @@ static struct fc_seq *fcoe_elsct_send(struct fc_lport *,
                                      void *, u32 timeout);
 static void fcoe_recv_frame(struct sk_buff *skb);
 
+static void fcoe_get_lesb(struct fc_lport *, struct fc_els_lesb *);
+
 module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR);
 __MODULE_PARM_TYPE(create, "string");
 MODULE_PARM_DESC(create, "Create fcoe fcoe using net device passed in.");
@@ -141,6 +143,7 @@ static struct libfc_function_template fcoe_libfc_fcn_templ = {
        .ddp_setup = fcoe_ddp_setup,
        .ddp_done = fcoe_ddp_done,
        .elsct_send = fcoe_elsct_send,
+       .get_lesb = fcoe_get_lesb,
 };
 
 struct fc_function_template fcoe_transport_function = {
@@ -2455,3 +2458,34 @@ static void fcoe_set_vport_symbolic_name(struct fc_vport *vport)
        lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID,
                             NULL, NULL, 3 * lport->r_a_tov);
 }
+
+/**
+ * fcoe_get_lesb() - Fill the FCoE Link Error Status Block
+ * @lport: the local port
+ * @fc_lesb: the link error status block
+ */
+static void fcoe_get_lesb(struct fc_lport *lport,
+                        struct fc_els_lesb *fc_lesb)
+{
+       unsigned int cpu;
+       u32 lfc, vlfc, mdac;
+       struct fcoe_dev_stats *devst;
+       struct fcoe_fc_els_lesb *lesb;
+       struct net_device *netdev = fcoe_netdev(lport);
+
+       lfc = 0;
+       vlfc = 0;
+       mdac = 0;
+       lesb = (struct fcoe_fc_els_lesb *)fc_lesb;
+       memset(lesb, 0, sizeof(*lesb));
+       for_each_possible_cpu(cpu) {
+               devst = per_cpu_ptr(lport->dev_stats, cpu);
+               lfc += devst->LinkFailureCount;
+               vlfc += devst->VLinkFailureCount;
+               mdac += devst->MissDiscAdvCount;
+       }
+       lesb->lesb_link_fail = htonl(lfc);
+       lesb->lesb_vlink_fail = htonl(vlfc);
+       lesb->lesb_miss_fka = htonl(mdac);
+       lesb->lesb_fcs_error = htonl(dev_get_stats(netdev)->rx_crc_errors);
+}

diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index b97be2903cbc6619da7e2050eb19217abf4ea753..4b912eee33e59301e505b6018cd3649120ef1371 100644 (file)
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -510,6 +510,12 @@ struct libfc_function_template {
         * STATUS: OPTIONAL
         */
        int (*ddp_done)(struct fc_lport *, u16);
+       /*
+        * Allow LLD to fill its own Link Error Status Block
+        *
+        * STATUS: OPTIONAL
+        */
+       void (*get_lesb)(struct fc_lport *, struct fc_els_lesb *lesb);
        /*
         * Send a frame using an existing sequence and exchange.
         *