1 files changed, 150 insertions, 63 deletions

diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index 9f2876397dda..45f9cc642c46 100644
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -22,6 +22,7 @@
 
 #include <linux/timer.h>
 #include <linux/if.h>
+#include <linux/percpu.h>
 
 #include <scsi/scsi_transport.h>
 #include <scsi/scsi_transport_fc.h>
@@ -68,9 +69,6 @@
 /*
  * FC HBA status
  */
-#define FC_PAUSE                    (1 << 1)
-#define FC_LINK_UP                  (1 << 0)
-
 enum fc_lport_state {
         LPORT_ST_NONE = 0,
         LPORT_ST_FLOGI,
@@ -248,6 +246,7 @@ struct fc_fcp_pkt {
          */
         struct fcp_cmnd cdb_cmd;
         size_t          xfer_len;
+        u16             xfer_ddp;       /* this xfer is ddped */
         u32             xfer_contig_end; /* offset of end of contiguous xfer */
         u16             max_payload;    /* max payload size in bytes */
 
@@ -270,6 +269,15 @@ struct fc_fcp_pkt {
         u8              recov_retry;    /* count of recovery retries */
         struct fc_seq   *recov_seq;     /* sequence for REC or SRR */
 };
+/*
+ * FC_FCP HELPER FUNCTIONS
+ *****************************/
+static inline bool fc_fcp_is_read(const struct fc_fcp_pkt *fsp)
+{
+        if (fsp && fsp->cmd)
+                return fsp->cmd->sc_data_direction == DMA_FROM_DEVICE;
+        return false;
+}
 
 /*
  * Structure and function definitions for managing Fibre Channel Exchanges
@@ -339,31 +347,17 @@ struct fc_exch {
 
 struct libfc_function_template {
 
-        /**
-         * Mandatory Fields
-         *
-         * These handlers must be implemented by the LLD.
-         */
-
         /*
          * Interface to send a FC frame
-         */
-        int (*frame_send)(struct fc_lport *lp, struct fc_frame *fp);
-
-        /**
-         * Optional Fields
          *
-         * The LLD may choose to implement any of the following handlers.
-         * If LLD doesn't specify hander and leaves its pointer NULL then
-         * the default libfc function will be used for that handler.
-         */
-
-        /**
-         * ELS/CT interfaces
+         * STATUS: REQUIRED
          */
+        int (*frame_send)(struct fc_lport *lp, struct fc_frame *fp);
 
         /*
-         * elsct_send - sends ELS/CT frame
+         * Interface to send ELS/CT frames
+         *
+         * STATUS: OPTIONAL
          */
         struct fc_seq *(*elsct_send)(struct fc_lport *lport,
                                      struct fc_rport *rport,
@@ -373,9 +367,6 @@ struct libfc_function_template {
                                              struct fc_frame *fp,
                                              void *arg),
                                      void *arg, u32 timer_msec);
-        /**
-         * Exhance Manager interfaces
-         */
 
         /*
          * Send the FC frame payload using a new exchange and sequence.
@@ -407,6 +398,8 @@ struct libfc_function_template {
          * timer_msec argument is specified. The timer is canceled when
          * it fires or when the exchange is done. The exchange timeout handler
          * is registered by EM layer.
+         *
+         * STATUS: OPTIONAL
          */
         struct fc_seq *(*exch_seq_send)(struct fc_lport *lp,
                                         struct fc_frame *fp,
@@ -418,14 +411,33 @@ struct libfc_function_template {
                                         void *arg, unsigned int timer_msec);
 
         /*
-         * send a frame using existing sequence and exchange.
+         * Sets up the DDP context for a given exchange id on the given
+         * scatterlist if LLD supports DDP for large receive.
+         *
+         * STATUS: OPTIONAL
+         */
+        int (*ddp_setup)(struct fc_lport *lp, u16 xid,
+                         struct scatterlist *sgl, unsigned int sgc);
+        /*
+         * Completes the DDP transfer and returns the length of data DDPed
+         * for the given exchange id.
+         *
+         * STATUS: OPTIONAL
+         */
+        int (*ddp_done)(struct fc_lport *lp, u16 xid);
+        /*
+         * Send a frame using an existing sequence and exchange.
+         *
+         * STATUS: OPTIONAL
          */
         int (*seq_send)(struct fc_lport *lp, struct fc_seq *sp,
                         struct fc_frame *fp);
 
         /*
-         * Send ELS response using mainly infomation
-         * in exchange and sequence in EM layer.
+         * Send an ELS response using infomation from a previous
+         * exchange and sequence.
+         *
+         * STATUS: OPTIONAL
          */
         void (*seq_els_rsp_send)(struct fc_seq *sp, enum fc_els_cmd els_cmd,
                                  struct fc_seq_els_data *els_data);
@@ -437,6 +449,8 @@ struct libfc_function_template {
          * A timer_msec can be specified for abort timeout, if non-zero
          * timer_msec value is specified then exchange resp handler
          * will be called with timeout error if no response to abort.
+         *
+         * STATUS: OPTIONAL
          */
         int (*seq_exch_abort)(const struct fc_seq *req_sp,
                               unsigned int timer_msec);
@@ -444,6 +458,8 @@ struct libfc_function_template {
         /*
          * Indicate that an exchange/sequence tuple is complete and the memory
          * allocated for the related objects may be freed.
+         *
+         * STATUS: OPTIONAL
          */
         void (*exch_done)(struct fc_seq *sp);
 
@@ -451,6 +467,8 @@ struct libfc_function_template {
          * Assigns a EM and a free XID for an new exchange and then
          * allocates a new exchange and sequence pair.
          * The fp can be used to determine free XID.
+         *
+         * STATUS: OPTIONAL
          */
         struct fc_exch *(*exch_get)(struct fc_lport *lp, struct fc_frame *fp);
 
@@ -458,12 +476,16 @@ struct libfc_function_template {
          * Release previously assigned XID by exch_get API.
          * The LLD may implement this if XID is assigned by LLD
          * in exch_get().
+         *
+         * STATUS: OPTIONAL
          */
         void (*exch_put)(struct fc_lport *lp, struct fc_exch_mgr *mp,
                          u16 ex_id);
 
         /*
          * Start a new sequence on the same exchange/sequence tuple.
+         *
+         * STATUS: OPTIONAL
          */
         struct fc_seq *(*seq_start_next)(struct fc_seq *sp);
 
@@ -471,26 +493,38 @@ struct libfc_function_template {
          * Reset an exchange manager, completing all sequences and exchanges.
          * If s_id is non-zero, reset only exchanges originating from that FID.
          * If d_id is non-zero, reset only exchanges sending to that FID.
+         *
+         * STATUS: OPTIONAL
          */
-        void (*exch_mgr_reset)(struct fc_exch_mgr *,
+        void (*exch_mgr_reset)(struct fc_lport *,
                                u32 s_id, u32 d_id);
 
-        void (*rport_flush_queue)(void);
-        /**
-         * Local Port interfaces
+        /*
+         * Flush the rport work queue. Generally used before shutdown.
+         *
+         * STATUS: OPTIONAL
          */
+        void (*rport_flush_queue)(void);
 
         /*
-         * Receive a frame to a local port.
+         * Receive a frame for a local port.
+         *
+         * STATUS: OPTIONAL
          */
         void (*lport_recv)(struct fc_lport *lp, struct fc_seq *sp,
                            struct fc_frame *fp);
 
+        /*
+         * Reset the local port.
+         *
+         * STATUS: OPTIONAL
+         */
         int (*lport_reset)(struct fc_lport *);
 
-        /**
-         * Remote Port interfaces
+        /*
+         * Create a remote port
          */
+        struct fc_rport *(*rport_create)(struct fc_disc_port *);
 
         /*
          * Initiates the RP state machine. It is called from the LP module.
@@ -500,26 +534,33 @@ struct libfc_function_template {
          * - PLOGI
          * - PRLI
          * - RTV
+         *
+         * STATUS: OPTIONAL
          */
         int (*rport_login)(struct fc_rport *rport);
 
         /*
          * Logoff, and remove the rport from the transport if
          * it had been added. This will send a LOGO to the target.
+         *
+         * STATUS: OPTIONAL
          */
         int (*rport_logoff)(struct fc_rport *rport);
 
         /*
          * Recieve a request from a remote port.
+         *
+         * STATUS: OPTIONAL
          */
         void (*rport_recv_req)(struct fc_seq *, struct fc_frame *,
                                struct fc_rport *);
 
-        struct fc_rport *(*rport_lookup)(const struct fc_lport *, u32);
-
-        /**
-         * FCP interfaces
+        /*
+         * lookup an rport by it's port ID.
+         *
+         * STATUS: OPTIONAL
          */
+        struct fc_rport *(*rport_lookup)(const struct fc_lport *, u32);
 
         /*
          * Send a fcp cmd from fsp pkt.
@@ -527,30 +568,38 @@ struct libfc_function_template {
          *
          * The resp handler is called when FCP_RSP received.
          *
+         * STATUS: OPTIONAL
          */
         int (*fcp_cmd_send)(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
                             void (*resp)(struct fc_seq *, struct fc_frame *fp,
                                          void *arg));
 
         /*
-         * Used at least durring linkdown and reset
+         * Cleanup the FCP layer, used durring link down and reset
+         *
+         * STATUS: OPTIONAL
          */
         void (*fcp_cleanup)(struct fc_lport *lp);
 
         /*
          * Abort all I/O on a local port
+         *
+         * STATUS: OPTIONAL
          */
         void (*fcp_abort_io)(struct fc_lport *lp);
 
-        /**
-         * Discovery interfaces
+        /*
+         * Receive a request for the discovery layer.
+         *
+         * STATUS: OPTIONAL
          */
-
         void (*disc_recv_req)(struct fc_seq *,
                               struct fc_frame *, struct fc_lport *);
 
         /*
          * Start discovery for a local port.
+         *
+         * STATUS: OPTIONAL
          */
         void (*disc_start)(void (*disc_callback)(struct fc_lport *,
                                                  enum fc_disc_event),
@@ -559,6 +608,8 @@ struct libfc_function_template {
         /*
          * Stop discovery for a given lport. This will remove
          * all discovered rports
+         *
+         * STATUS: OPTIONAL
          */
         void (*disc_stop) (struct fc_lport *);
 
@@ -566,6 +617,8 @@ struct libfc_function_template {
          * Stop discovery for a given lport. This will block
          * until all discovered rports are deleted from the
          * FC transport class
+         *
+         * STATUS: OPTIONAL
          */
         void (*disc_stop_final) (struct fc_lport *);
 };
@@ -584,6 +637,7 @@ struct fc_disc {
                               enum fc_disc_event);
 
         struct list_head         rports;
+        struct list_head         rogue_rports;
         struct fc_lport         *lport;
         struct mutex            disc_mutex;
         struct fc_gpn_ft_resp   partial_buf;    /* partial name buffer */
@@ -603,12 +657,14 @@ struct fc_lport {
 
         /* Operational Information */
         struct libfc_function_template tt;
-        u16                     link_status;
+        u8                      link_up;
+        u8                      qfull;
         enum fc_lport_state     state;
         unsigned long           boot_time;
 
         struct fc_host_statistics host_stats;
-        struct fcoe_dev_stats   *dev_stats[NR_CPUS];
+        struct fcoe_dev_stats   *dev_stats;
+
         u64                     wwpn;
         u64                     wwnn;
         u8                      retry_count;
@@ -626,6 +682,7 @@ struct fc_lport {
         u16                     link_speed;
         u16                     link_supported_speeds;
         u16                     lro_xid;        /* max xid for fcoe lro */
+        unsigned int            lso_max;        /* max large send size */
         struct fc_ns_fts        fcts;           /* FC-4 type masks */
         struct fc_els_rnid_gen  rnid_gen;       /* RNID information */
 
@@ -637,14 +694,9 @@ struct fc_lport {
         struct delayed_work     disc_work;
 };
 
-/**
+/*
  * FC_LPORT HELPER FUNCTIONS
  *****************************/
-static inline void *lport_priv(const struct fc_lport *lp)
-{
-        return (void *)(lp + 1);
-}
-
 static inline int fc_lport_test_ready(struct fc_lport *lp)
 {
         return lp->state == LPORT_ST_READY;
@@ -668,8 +720,44 @@ static inline void fc_lport_state_enter(struct fc_lport *lp,
         lp->state = state;
 }
 
+static inline int fc_lport_init_stats(struct fc_lport *lp)
+{
+        /* allocate per cpu stats block */
+        lp->dev_stats = alloc_percpu(struct fcoe_dev_stats);
+        if (!lp->dev_stats)
+                return -ENOMEM;
+        return 0;
+}
+
+static inline void fc_lport_free_stats(struct fc_lport *lp)
+{
+        free_percpu(lp->dev_stats);
+}
+
+static inline struct fcoe_dev_stats *fc_lport_get_stats(struct fc_lport *lp)
+{
+        return per_cpu_ptr(lp->dev_stats, smp_processor_id());
+}
+
+static inline void *lport_priv(const struct fc_lport *lp)
+{
+        return (void *)(lp + 1);
+}
 
 /**
+ * libfc_host_alloc() - Allocate a Scsi_Host with room for the fc_lport
+ * @sht: ptr to the scsi host templ
+ * @priv_size: size of private data after fc_lport
+ *
+ * Returns: ptr to Scsi_Host
+ */
+static inline struct Scsi_Host *
+libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
+{
+        return scsi_host_alloc(sht, sizeof(struct fc_lport) + priv_size);
+}
+
+/*
  * LOCAL PORT LAYER
  *****************************/
 int fc_lport_init(struct fc_lport *lp);
@@ -704,12 +792,6 @@ void fc_linkup(struct fc_lport *);
 void fc_linkdown(struct fc_lport *);
 
 /*
- * Pause and unpause traffic.
- */
-void fc_pause(struct fc_lport *);
-void fc_unpause(struct fc_lport *);
-
-/*
  * Configure the local port.
  */
 int fc_lport_config(struct fc_lport *);
@@ -725,19 +807,19 @@ int fc_lport_reset(struct fc_lport *);
 int fc_set_mfs(struct fc_lport *lp, u32 mfs);
 
 
-/**
+/*
  * REMOTE PORT LAYER
  *****************************/
 int fc_rport_init(struct fc_lport *lp);
 void fc_rport_terminate_io(struct fc_rport *rp);
 
-/**
+/*
  * DISCOVERY LAYER
  *****************************/
 int fc_disc_init(struct fc_lport *lp);
 
 
-/**
+/*
  * SCSI LAYER
  *****************************/
 /*
@@ -798,7 +880,12 @@ int fc_change_queue_type(struct scsi_device *sdev, int tag_type);
  */
 void fc_fcp_destroy(struct fc_lport *);
 
-/**
+/*
+ * Set up direct-data placement for this I/O request
+ */
+void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid);
+
+/*
  * ELS/CT interface
  *****************************/
 /*
@@ -807,7 +894,7 @@ void fc_fcp_destroy(struct fc_lport *);
 int fc_elsct_init(struct fc_lport *lp);
 
 
-/**
+/*
  * EXCHANGE MANAGER LAYER
  *****************************/
 /*
@@ -916,7 +1003,7 @@ struct fc_seq *fc_seq_start_next(struct fc_seq *sp);
  * If s_id is non-zero, reset only exchanges originating from that FID.
  * If d_id is non-zero, reset only exchanges sending to that FID.
  */
-void fc_exch_mgr_reset(struct fc_exch_mgr *, u32 s_id, u32 d_id);
+void fc_exch_mgr_reset(struct fc_lport *, u32 s_id, u32 d_id);
 
 /*
  * Functions for fc_functions_template