Sys files of 'extended_tag' and 'max_read_request_size' are supported by
igb_uio. Reading or writing them to enable/disable 'Extended Tag' or
reset 'Max Read Request Size' automatically according to the configurations
are added.
Signed-off-by: Helin Zhang <helin.zhang at intel.com>
Signed-off-by: Mark Chen <jing.d.chen at intel.com>
---
lib/librte_eal/linuxapp/eal/eal_pci.c | 101 ++++++++++++++++++++++++++++++++++
1 file changed, 101 insertions(+)
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c
b/lib/librte_eal/linuxapp/eal/eal_pci.c
index ac2c1fe..3956e88 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -107,6 +107,11 @@ TAILQ_HEAD(uio_res_list, uio_resource);
static struct uio_res_list *uio_res_list = NULL;
static int pci_parse_sysfs_value(const char *filename, uint64_t *val);
+
+#ifdef RTE_PCI_CONFIG
+static void pci_config_space_set(struct rte_pci_device *dev);
+#endif
+
/* unbind kernel driver for this device */
static int
pci_unbind_kernel_driver(struct rte_pci_device *dev)
@@ -840,6 +845,13 @@ rte_eal_pci_probe_one_driver(struct rte_pci_driver *dr,
struct rte_pci_device *d
}
if (dr->drv_flags & RTE_PCI_DRV_NEED_IGB_UIO) {
+#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 */
if (pci_uio_map_resource(dev) < 0)
return -1;
@@ -878,3 +890,92 @@ rte_eal_pci_init(void)
}
return 0;
}
+
+#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;
+
+ rte_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;
+ uint32_t max_size = RTE_PCI_MAX_READ_REQUEST_SIZE;
+
+ /* not configured, let it as is */
+ if (!max_size)
+ return 0;
+
+ rte_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);
+ rte_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;
+}
+
+static void
+pci_config_space_set(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);
+}
+#endif
--
1.8.1.4
