[dpdk-dev] [PATCH v2 2/3] eal: remove pci config of extended tag

[Helin Zhang <helin.zhang@intel.com>]

Remove pci configuration of 'extended tag' and 'max read request
size', as they are not required by all devices and it lets PMD to
configure them if neccessary.
In addition, 'pci_config_space_set()' is deprecated.

Signed-off-by: Helin Zhang <helin.zhang@intel.com>
Acked-by: Jingjing Wu <jingjing.wu@intel.com>
---
 config/common_linuxapp                  |  1 +
 lib/librte_eal/common/eal_common_pci.c  |  7 ---
 lib/librte_eal/common/include/rte_pci.h |  4 +-
 lib/librte_eal/linuxapp/eal/eal_pci.c   | 90 +++------------------------------
 4 files changed, 10 insertions(+), 92 deletions(-)

v2:
 - Fixed the compile warnings.

diff --git a/config/common_linuxapp b/config/common_linuxapp
index f1638db..a74cbab 100644
--- a/config/common_linuxapp
+++ b/config/common_linuxapp
@@ -110,6 +110,7 @@ CONFIG_RTE_EAL_PMD_PATH=""
 
 #
 # Special configurations in PCI Config Space for high performance
+# They are all deprecated, and will be removed later.
 #
 CONFIG_RTE_PCI_CONFIG=n
 CONFIG_RTE_PCI_EXTENDED_TAG=""
diff --git a/lib/librte_eal/common/eal_common_pci.c b/lib/librte_eal/common/eal_common_pci.c
index 96d5113..366fb46 100644
--- a/lib/librte_eal/common/eal_common_pci.c
+++ b/lib/librte_eal/common/eal_common_pci.c
@@ -180,13 +180,6 @@ rte_eal_pci_probe_one_driver(struct rte_pci_driver *dr, struct rte_pci_device *d
 		}
 
 		if (dr->drv_flags & RTE_PCI_DRV_NEED_MAPPING) {
-#ifdef RTE_PCI_CONFIG
-			/*
-			 * Set PCIe config space for high performance.
-			 * Return value can be ignored.
-			 */
-			pci_config_space_set(dev);
-#endif
 			/* map resources for devices that use igb_uio */
 			ret = rte_eal_pci_map_device(dev);
 			if (ret != 0)
diff --git a/lib/librte_eal/common/include/rte_pci.h b/lib/librte_eal/common/include/rte_pci.h
index 067e084..189d509 100644
--- a/lib/librte_eal/common/include/rte_pci.h
+++ b/lib/librte_eal/common/include/rte_pci.h
@@ -580,12 +580,14 @@ void rte_eal_pci_ioport_write(struct rte_pci_ioport *p,
 #ifdef RTE_PCI_CONFIG
 /**
  * Set special config space registers for performance purpose.
+ * It is deprecated, as all configurations have been moved into
+ * each PMDs respectively.
  *
  * @param dev
  *   A pointer to a rte_pci_device structure describing the device
  *   to use
  */
-void pci_config_space_set(struct rte_pci_device *dev);
+void pci_config_space_set(struct rte_pci_device *dev) __rte_deprecated;
 #endif /* RTE_PCI_CONFIG */
 
 #ifdef __cplusplus
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
index 4346973..4c45452 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -482,92 +482,14 @@ error:
 }
 
 #ifdef RTE_PCI_CONFIG
-static int
-pci_config_extended_tag(struct rte_pci_device *dev)
-{
-	struct rte_pci_addr *loc = &dev->addr;
-	char filename[PATH_MAX];
-	char buf[BUFSIZ];
-	FILE *f;
-
-	/* not configured, let it as is */
-	if (strncmp(RTE_PCI_EXTENDED_TAG, "on", 2) != 0 &&
-		strncmp(RTE_PCI_EXTENDED_TAG, "off", 3) != 0)
-		return 0;
-
-	snprintf(filename, sizeof(filename),
-		SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/" "extended_tag",
-		loc->domain, loc->bus, loc->devid, loc->function);
-	f = fopen(filename, "rw+");
-	if (!f)
-		return -1;
-
-	fgets(buf, sizeof(buf), f);
-	if (strncmp(RTE_PCI_EXTENDED_TAG, "on", 2) == 0) {
-		/* enable Extended Tag*/
-		if (strncmp(buf, "on", 2) != 0) {
-			fseek(f, 0, SEEK_SET);
-			fputs("on", f);
-		}
-	} else {
-		/* disable Extended Tag */
-		if (strncmp(buf, "off", 3) != 0) {
-			fseek(f, 0, SEEK_SET);
-			fputs("off", f);
-		}
-	}
-	fclose(f);
-
-	return 0;
-}
-
-static int
-pci_config_max_read_request_size(struct rte_pci_device *dev)
-{
-	struct rte_pci_addr *loc = &dev->addr;
-	char filename[PATH_MAX];
-	char buf[BUFSIZ], param[BUFSIZ];
-	FILE *f;
-	/* size can be 128, 256, 512, 1024, 2048, 4096 */
-	uint32_t max_size = RTE_PCI_MAX_READ_REQUEST_SIZE;
-
-	/* not configured, let it as is */
-	if (!max_size)
-		return 0;
-
-	snprintf(filename, sizeof(filename),
-		SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/" "max_read_request_size",
-			loc->domain, loc->bus, loc->devid, loc->function);
-	f = fopen(filename, "rw+");
-	if (!f)
-		return -1;
-
-	fgets(buf, sizeof(buf), f);
-	snprintf(param, sizeof(param), "%d", max_size);
-
-	/* check if the size to be set is the same as current */
-	if (strcmp(buf, param) == 0) {
-		fclose(f);
-		return 0;
-	}
-	fseek(f, 0, SEEK_SET);
-	fputs(param, f);
-	fclose(f);
-
-	return 0;
-}
-
+/*
+ * It is deprecated, all its configurations have been moved into
+ * each PMD respectively.
+ */
 void
-pci_config_space_set(struct rte_pci_device *dev)
+pci_config_space_set(__rte_unused struct rte_pci_device *dev)
 {
-	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
-		return;
-
-	/* configure extended tag */
-	pci_config_extended_tag(dev);
-
-	/* configure max read request size */
-	pci_config_max_read_request_size(dev);
+	RTE_LOG(DEBUG, EAL, "Nothing here, as it is deprecated\n");
 }
 #endif
 
-- 
1.9.3