From: Tetsuya Mukawa Date: Wed, 25 Feb 2015 19:32:19 +0000 (+0900) Subject: pci: consolidate address comparisons X-Git-Tag: spdx-start~9537 X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=c0ce0577e84de15b2d3f6301f0b4ce6826900e9b;p=dpdk.git pci: consolidate address comparisons This patch replaces pci_addr_comparison() and memcmp() of pci addresses by rte_eal_compare_pci_addr(). To compare PCI addresses, rte_eal_compare_pci_addr() doesn't use memcmp(). This is because sizeof(struct rte_pci_addr) returns 6, but actually this structure is like below. struct rte_pci_addr { uint16_t domain; /**< Device domain */ uint8_t bus; /**< Device bus */ uint8_t devid; /**< Device ID */ uint8_t function; /**< Device function. */ }; If the structure is dynamically allocated in a function without bzero, last 1 byte may have value. As a result, memcmp may not work. To avoid such a case, rte_eal_compare_pci_addr() compare following values. dev_addr = (addr->domain << 24) | (addr->bus << 16) | (addr->devid << 8) | addr->function; Signed-off-by: Tetsuya Mukawa --- diff --git a/lib/librte_eal/bsdapp/eal/eal_pci.c b/lib/librte_eal/bsdapp/eal/eal_pci.c index 74ecce75d9..9193f8004a 100644 --- a/lib/librte_eal/bsdapp/eal/eal_pci.c +++ b/lib/librte_eal/bsdapp/eal/eal_pci.c @@ -270,20 +270,6 @@ pci_uio_map_resource(struct rte_pci_device *dev) return (0); } -/* Compare two PCI device addresses. */ -static int -pci_addr_comparison(struct rte_pci_addr *addr, struct rte_pci_addr *addr2) -{ - uint64_t dev_addr = (addr->domain << 24) + (addr->bus << 16) + (addr->devid << 8) + addr->function; - uint64_t dev_addr2 = (addr2->domain << 24) + (addr2->bus << 16) + (addr2->devid << 8) + addr2->function; - - if (dev_addr > dev_addr2) - return 1; - else - return 0; -} - - /* Scan one pci sysfs entry, and fill the devices list from it. */ static int pci_scan_one(int dev_pci_fd, struct pci_conf *conf) @@ -356,13 +342,24 @@ pci_scan_one(int dev_pci_fd, struct pci_conf *conf) } else { struct rte_pci_device *dev2 = NULL; + int ret; TAILQ_FOREACH(dev2, &pci_device_list, next) { - if (pci_addr_comparison(&dev->addr, &dev2->addr)) + ret = rte_eal_compare_pci_addr(&dev->addr, &dev2->addr); + if (ret > 0) continue; - else { + else if (ret < 0) { TAILQ_INSERT_BEFORE(dev2, dev, next); return 0; + } else { /* already registered */ + /* update pt_driver */ + dev2->pt_driver = dev->pt_driver; + dev2->max_vfs = dev->max_vfs; + memmove(dev2->mem_resource, + dev->mem_resource, + sizeof(dev->mem_resource)); + free(dev); + return 0; } } TAILQ_INSERT_TAIL(&pci_device_list, dev, next); diff --git a/lib/librte_eal/common/eal_common_pci.c b/lib/librte_eal/common/eal_common_pci.c index f3c7f71a69..bf2793f9e8 100644 --- a/lib/librte_eal/common/eal_common_pci.c +++ b/lib/librte_eal/common/eal_common_pci.c @@ -93,7 +93,7 @@ static struct rte_devargs *pci_devargs_lookup(struct rte_pci_device *dev) if (devargs->type != RTE_DEVTYPE_BLACKLISTED_PCI && devargs->type != RTE_DEVTYPE_WHITELISTED_PCI) continue; - if (!memcmp(&dev->addr, &devargs->pci.addr, sizeof(dev->addr))) + if (!rte_eal_compare_pci_addr(&dev->addr, &devargs->pci.addr)) return devargs; } return NULL; diff --git a/lib/librte_eal/common/include/rte_pci.h b/lib/librte_eal/common/include/rte_pci.h index a87b4b3b88..ec2e2b03f0 100644 --- a/lib/librte_eal/common/include/rte_pci.h +++ b/lib/librte_eal/common/include/rte_pci.h @@ -270,6 +270,40 @@ eal_parse_pci_DomBDF(const char *input, struct rte_pci_addr *dev_addr) } #undef GET_PCIADDR_FIELD +/* Compare two PCI device addresses. */ +/** + * Utility function to compare two PCI device addresses. + * + * @param addr + * The PCI Bus-Device-Function address to compare + * @param addr2 + * The PCI Bus-Device-Function address to compare + * @return + * 0 on equal PCI address. + * Positive on addr is greater than addr2. + * Negative on addr is less than addr2, or error. + */ +static inline int +rte_eal_compare_pci_addr(struct rte_pci_addr *addr, struct rte_pci_addr *addr2) +{ + uint64_t dev_addr, dev_addr2; + + if ((addr == NULL) || (addr2 == NULL)) + return -1; + + dev_addr = (addr->domain << 24) | (addr->bus << 16) | + (addr->devid << 8) | addr->function; + dev_addr2 = (addr2->domain << 24) | (addr2->bus << 16) | + (addr2->devid << 8) | addr2->function; + + if (dev_addr > dev_addr2) + return 1; + else if (dev_addr < dev_addr2) + return -1; + else + return 0; +} + /** * Probe the PCI bus for registered drivers. * diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c index 3291c68d02..06bfc1a6f6 100644 --- a/lib/librte_eal/linuxapp/eal/eal_pci.c +++ b/lib/librte_eal/linuxapp/eal/eal_pci.c @@ -41,6 +41,7 @@ #include #include #include +#include #include "rte_pci_dev_ids.h" #include "eal_filesystem.h" @@ -228,20 +229,6 @@ error: return -1; } -/* Compare two PCI device addresses. */ -static int -pci_addr_comparison(struct rte_pci_addr *addr, struct rte_pci_addr *addr2) -{ - uint64_t dev_addr = (addr->domain << 24) + (addr->bus << 16) + (addr->devid << 8) + addr->function; - uint64_t dev_addr2 = (addr2->domain << 24) + (addr2->bus << 16) + (addr2->devid << 8) + addr2->function; - - if (dev_addr > dev_addr2) - return 1; - else - return 0; -} - - /* Scan one pci sysfs entry, and fill the devices list from it. */ static int pci_scan_one(const char *dirname, uint16_t domain, uint8_t bus, @@ -359,13 +346,24 @@ pci_scan_one(const char *dirname, uint16_t domain, uint8_t bus, } else { struct rte_pci_device *dev2 = NULL; + int ret; TAILQ_FOREACH(dev2, &pci_device_list, next) { - if (pci_addr_comparison(&dev->addr, &dev2->addr)) + ret = rte_eal_compare_pci_addr(&dev->addr, &dev2->addr); + if (ret > 0) continue; - else { + else if (ret < 0) { TAILQ_INSERT_BEFORE(dev2, dev, next); return 0; + } else { /* already registered */ + /* update pt_driver */ + dev2->pt_driver = dev->pt_driver; + dev2->max_vfs = dev->max_vfs; + memmove(dev2->mem_resource, + dev->mem_resource, + sizeof(dev->mem_resource)); + free(dev); + return 0; } } TAILQ_INSERT_TAIL(&pci_device_list, dev, next); diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c index 0a9537666a..c5e0cf3db5 100644 --- a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c +++ b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c @@ -91,7 +91,7 @@ pci_uio_map_secondary(struct rte_pci_device *dev) TAILQ_FOREACH(uio_res, pci_res_list, next) { /* skip this element if it doesn't match our PCI address */ - if (memcmp(&uio_res->pci_addr, &dev->addr, sizeof(dev->addr))) + if (rte_eal_compare_pci_addr(&uio_res->pci_addr, &dev->addr)) continue; for (i = 0; i != uio_res->nb_maps; i++) {