[PATCH v6 1/8] eal: pci: add api to rd/wr pci bar region

[Santosh Shukla <sshukla@mvista.com>]

Introducing below api for pci bar region rd/wr.
Api's are:
- rte_eal_pci_read_bar
- rte_eal_pci_write_bar

Signed-off-by: Santosh Shukla <sshukla@mvista.com>
---
v5-->v6:
- update api infor in rte_eal_version.map file
  suggested by david manchand.

 lib/librte_eal/bsdapp/eal/eal_pci.c             |   19 ++++++++++++
 lib/librte_eal/bsdapp/eal/rte_eal_version.map   |    3 ++
 lib/librte_eal/common/include/rte_pci.h         |   38 +++++++++++++++++++++++
 lib/librte_eal/linuxapp/eal/eal_pci.c           |   34 ++++++++++++++++++++
 lib/librte_eal/linuxapp/eal/eal_pci_init.h      |    6 ++++
 lib/librte_eal/linuxapp/eal/eal_pci_vfio.c      |   28 +++++++++++++++++
 lib/librte_eal/linuxapp/eal/rte_eal_version.map |    3 ++
 7 files changed, 131 insertions(+)

diff --git a/lib/librte_eal/bsdapp/eal/eal_pci.c b/lib/librte_eal/bsdapp/eal/eal_pci.c
index 95c32c1..2e535ea 100644
--- a/lib/librte_eal/bsdapp/eal/eal_pci.c
+++ b/lib/librte_eal/bsdapp/eal/eal_pci.c
@@ -479,6 +479,25 @@ int rte_eal_pci_write_config(const struct rte_pci_device *dev,
 	return -1;
 }
 
+int rte_eal_pci_read_bar(const struct rte_pci_device *device __rte_unused,
+			 void *buf __rte_unused, size_t len __rte_unused,
+			 off_t offset __rte_unused,
+			 int bar_idx __rte_unused)
+
+{
+	/* NA */
+	return 1;
+}
+
+int rte_eal_pci_write_bar(const struct rte_pci_device *device __rte_unused,
+			  const void *buf __rte_unused, size_t len __rte_unused,
+			  off_t offset __rte_unused,
+			  int bar_idx __rte_unused)
+{
+	/* NA */
+	return 1;
+}
+
 /* Init the PCI EAL subsystem */
 int
 rte_eal_pci_init(void)
diff --git a/lib/librte_eal/bsdapp/eal/rte_eal_version.map b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
index 1b28170..7c7dcf0 100644
--- a/lib/librte_eal/bsdapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
@@ -141,4 +141,7 @@ DPDK_2.3 {
 
 	rte_eal_pci_map_device;
 	rte_eal_pci_unmap_device;
+	rte_eal_pci_read_bar;
+	rte_eal_pci_write_bar;
+
 } DPDK_2.2;
diff --git a/lib/librte_eal/common/include/rte_pci.h b/lib/librte_eal/common/include/rte_pci.h
index 2224109..0c667ff 100644
--- a/lib/librte_eal/common/include/rte_pci.h
+++ b/lib/librte_eal/common/include/rte_pci.h
@@ -471,6 +471,44 @@ int rte_eal_pci_read_config(const struct rte_pci_device *device,
 			    void *buf, size_t len, off_t offset);
 
 /**
+ * Read PCI bar space.
+ *
+ * @param device
+ *   A pointer to a rte_pci_device structure describing the device
+ *   to use
+ * @param buf
+ *   A data buffer where the bytes should be read into
+ * @param len
+ *   The length of the data buffer.
+ * @param offset
+ *   The offset into PCI bar space
+ * @param bar_idx
+ *   The pci bar index (valid range is 0..5)
+ */
+int rte_eal_pci_read_bar(const struct rte_pci_device *device,
+			 void *buf, size_t len, off_t offset, int bar_idx);
+
+/**
+ * Write PCI bar space.
+ *
+ * @param device
+ *   A pointer to a rte_pci_device structure describing the device
+ *   to use
+ * @param buf
+ *   A data buffer containing the bytes should be written
+ * @param len
+ *   The length of the data buffer.
+ * @param offset
+ *   The offset into PCI config space
+ * @param bar_idx
+ *   The pci bar index (valid range is 0..5)
+*/
+int rte_eal_pci_write_bar(const struct rte_pci_device *device,
+			  const void *buf, size_t len, off_t offset,
+			  int bar_idx);
+
+
+/**
  * Write PCI config space.
  *
  * @param device
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
index db947da..eb503f0 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -621,6 +621,40 @@ int rte_eal_pci_write_config(const struct rte_pci_device *device,
 	}
 }
 
+int rte_eal_pci_read_bar(const struct rte_pci_device *device,
+			 void *buf, size_t len, off_t offset,
+			 int bar_idx)
+
+{
+	const struct rte_intr_handle *intr_handle = &device->intr_handle;
+
+	switch (device->kdrv) {
+	case RTE_KDRV_VFIO:
+		return pci_vfio_read_bar(intr_handle, buf, len,
+					 offset, bar_idx);
+	default:
+		RTE_LOG(ERR, EAL, "write bar not supported by driver\n");
+		return -1;
+	}
+}
+
+int rte_eal_pci_write_bar(const struct rte_pci_device *device,
+			  const void *buf, size_t len, off_t offset,
+			  int bar_idx)
+{
+
+	const struct rte_intr_handle *intr_handle = &device->intr_handle;
+
+	switch (device->kdrv) {
+	case RTE_KDRV_VFIO:
+		return pci_vfio_write_bar(intr_handle, buf, len,
+					  offset, bar_idx);
+	default:
+		RTE_LOG(ERR, EAL, "write bar not supported by driver\n");
+		return -1;
+	}
+}
+
 /* Init the PCI EAL subsystem */
 int
 rte_eal_pci_init(void)
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_init.h b/lib/librte_eal/linuxapp/eal/eal_pci_init.h
index a17c708..3bc592b 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci_init.h
+++ b/lib/librte_eal/linuxapp/eal/eal_pci_init.h
@@ -68,6 +68,12 @@ int pci_vfio_read_config(const struct rte_intr_handle *intr_handle,
 int pci_vfio_write_config(const struct rte_intr_handle *intr_handle,
 			  const void *buf, size_t len, off_t offs);
 
+int pci_vfio_read_bar(const struct rte_intr_handle *intr_handle,
+		      void *buf, size_t len, off_t offs, int bar_idx);
+
+int pci_vfio_write_bar(const struct rte_intr_handle *intr_handle,
+		       const void *buf, size_t len, off_t offs, int bar_idx);
+
 /* map VFIO resource prototype */
 int pci_vfio_map_resource(struct rte_pci_device *dev);
 int pci_vfio_get_group_fd(int iommu_group_fd);
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c b/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c
index a6c7e16..34c4558 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c
@@ -156,6 +156,34 @@ pci_vfio_write_config(const struct rte_intr_handle *intr_handle,
 	       VFIO_GET_REGION_ADDR(VFIO_PCI_CONFIG_REGION_INDEX) + offs);
 }
 
+int
+pci_vfio_read_bar(const struct rte_intr_handle *intr_handle,
+		  void *buf, size_t len, off_t offs, int bar_idx)
+{
+	if (bar_idx < VFIO_PCI_BAR0_REGION_INDEX
+	   || bar_idx > VFIO_PCI_BAR5_REGION_INDEX) {
+		RTE_LOG(ERR, EAL, "invalid bar_idx!\n");
+		return -1;
+	}
+
+	return pread64(intr_handle->vfio_dev_fd, buf, len,
+		       VFIO_GET_REGION_ADDR(bar_idx) + offs);
+}
+
+int
+pci_vfio_write_bar(const struct rte_intr_handle *intr_handle,
+		   const void *buf, size_t len, off_t offs, int bar_idx)
+{
+	if (bar_idx < VFIO_PCI_BAR0_REGION_INDEX
+	   || bar_idx > VFIO_PCI_BAR5_REGION_INDEX) {
+		RTE_LOG(ERR, EAL, "invalid bar_idx!\n");
+		return -1;
+	}
+
+	return pwrite64(intr_handle->vfio_dev_fd, buf, len,
+			VFIO_GET_REGION_ADDR(bar_idx) + offs);
+}
+
 /* get PCI BAR number where MSI-X interrupts are */
 static int
 pci_vfio_get_msix_bar(int fd, int *msix_bar, uint32_t *msix_table_offset,
diff --git a/lib/librte_eal/linuxapp/eal/rte_eal_version.map b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
index b9937c4..371b6c1 100644
--- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
@@ -144,4 +144,7 @@ DPDK_2.3 {
 
 	rte_eal_pci_map_device;
 	rte_eal_pci_unmap_device;
+	rte_eal_pci_read_bar;
+	rte_eal_pci_write_bar;
+
 } DPDK_2.2;
-- 
1.7.9.5