Linux (and FreeBSD) has a limitation of 108 characters for any unix domain socket path. Therefore DPDK would not work if a really large runtime directory was used.
Signed-off-by: Stephen Hemminger <[email protected]> --- lib/eal/common/eal_common_config.c | 6 ++++-- lib/eal/common/eal_common_proc.c | 18 +++++++++--------- lib/eal/common/eal_filesystem.h | 6 +++++- 3 files changed, 18 insertions(+), 12 deletions(-) diff --git a/lib/eal/common/eal_common_config.c b/lib/eal/common/eal_common_config.c index 7fc7611a07..e2e69a75fb 100644 --- a/lib/eal/common/eal_common_config.c +++ b/lib/eal/common/eal_common_config.c @@ -6,6 +6,7 @@ #include <eal_export.h> #include "eal_private.h" +#include "eal_filesystem.h" #include "eal_memcfg.h" /* early configuration structure, when memory config is not mmapped */ @@ -24,7 +25,7 @@ static struct rte_config rte_config = { }; /* platform-specific runtime dir */ -static char runtime_dir[PATH_MAX]; +static char runtime_dir[UNIX_PATH_MAX]; /* internal configuration */ static struct internal_config internal_config; @@ -39,7 +40,8 @@ rte_eal_get_runtime_dir(void) int eal_set_runtime_dir(const char *run_dir) { - if (strlcpy(runtime_dir, run_dir, PATH_MAX) >= PATH_MAX) { + /* runtime directory limited by maximum allowable unix domain socket */ + if (strlcpy(runtime_dir, run_dir, UNIX_PATH_MAX) >= UNIX_PATH_MAX) { EAL_LOG(ERR, "Runtime directory string too long"); return -1; } diff --git a/lib/eal/common/eal_common_proc.c b/lib/eal/common/eal_common_proc.c index 62fd4ba88f..3c4a1850ff 100644 --- a/lib/eal/common/eal_common_proc.c +++ b/lib/eal/common/eal_common_proc.c @@ -36,10 +36,10 @@ static RTE_ATOMIC(int) mp_fd = -1; static rte_thread_t mp_handle_tid; -static char mp_filter[PATH_MAX]; /* Filter for secondary process sockets */ -static char mp_dir_path[PATH_MAX]; /* The directory path for all mp sockets */ +static char mp_filter[UNIX_PATH_MAX]; /* Filter for secondary process sockets */ +static char mp_dir_path[UNIX_PATH_MAX]; /* The directory path for all mp sockets */ static pthread_mutex_t mp_mutex_action = PTHREAD_MUTEX_INITIALIZER; -static char peer_name[PATH_MAX]; +static char peer_name[UNIX_PATH_MAX]; struct action_entry { TAILQ_ENTRY(action_entry) next; @@ -78,7 +78,7 @@ struct pending_request { REQUEST_TYPE_SYNC, REQUEST_TYPE_ASYNC } type; - char dst[PATH_MAX]; + char dst[UNIX_PATH_MAX]; struct rte_mp_msg *request; struct rte_mp_msg *reply; int reply_received; @@ -599,7 +599,7 @@ open_socket_fd(void) static void close_socket_fd(int fd) { - char path[PATH_MAX]; + char path[UNIX_PATH_MAX]; close(fd); create_socket_path(peer_name, path, sizeof(path)); @@ -609,7 +609,7 @@ close_socket_fd(int fd) int rte_mp_channel_init(void) { - char path[PATH_MAX]; + char path[UNIX_PATH_MAX]; int dir_fd; const struct internal_config *internal_conf = eal_get_internal_configuration(); @@ -779,7 +779,7 @@ mp_send(struct rte_mp_msg *msg, const char *peer, int type) } while ((ent = readdir(mp_dir))) { - char path[PATH_MAX]; + char path[UNIX_PATH_MAX]; if (fnmatch(mp_filter, ent->d_name, 0) != 0) continue; @@ -1055,7 +1055,7 @@ rte_mp_request_sync(struct rte_mp_msg *req, struct rte_mp_reply *reply, pthread_mutex_lock(&pending_requests.lock); while ((ent = readdir(mp_dir))) { - char path[PATH_MAX]; + char path[UNIX_PATH_MAX]; if (fnmatch(mp_filter, ent->d_name, 0) != 0) continue; @@ -1200,7 +1200,7 @@ rte_mp_request_async(struct rte_mp_msg *req, const struct timespec *ts, } while ((ent = readdir(mp_dir))) { - char path[PATH_MAX]; + char path[UNIX_PATH_MAX]; if (fnmatch(mp_filter, ent->d_name, 0) != 0) continue; diff --git a/lib/eal/common/eal_filesystem.h b/lib/eal/common/eal_filesystem.h index 5d21f07c20..5371d9f1d6 100644 --- a/lib/eal/common/eal_filesystem.h +++ b/lib/eal/common/eal_filesystem.h @@ -45,10 +45,14 @@ eal_runtime_config_path(void) /** Path of primary/secondary communication unix socket file. */ #define MP_SOCKET_FNAME "mp_socket" + +/** Maximum length of unix domain socket path as defined in sys/un.h */ +#define UNIX_PATH_MAX 108 + static inline const char * eal_mp_socket_path(void) { - static char buffer[PATH_MAX]; /* static so auto-zeroed */ + static char buffer[UNIX_PATH_MAX]; /* static so auto-zeroed */ snprintf(buffer, sizeof(buffer), "%s/%s", rte_eal_get_runtime_dir(), MP_SOCKET_FNAME); -- 2.51.0
