[SCSI] libfc: add support of large receive offload by ddp in fc_fcp

[safe/jmp/linux-2.6] / include / scsi / libfc.h

diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index 61c746c..a70eafa 100644 (file)
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -245,6 +245,7 @@ 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 */
 
@@ -267,6 +268,15 @@ 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
@@ -400,6 +410,21 @@ struct libfc_function_template {
                                        void *arg, unsigned int timer_msec);
 
        /*
+        * 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
@@ -822,6 +847,11 @@ 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
  *****************************/
 /*