[dpdk-dev] [PATCH] eal: fix rte_errno values for IPC API

[Anatoly Burakov]

rte_errno values should not be negative.

Fixes: bacaa2754017 ("eal: add channel for multi-process communication")
Fixes: 783b6e54971d ("eal: add synchronous multi-process communication")
Cc: jianfeng....@intel.com
Signed-off-by: Anatoly Burakov <anatoly.bura...@intel.com>
---

Notes:
    This is in DPDK coding style guide:
    
    http://dpdk.org/doc/guides/contributing/coding_style.html
    
    However, i should note that situation with this is a mess
    in DPDK, and in a lot of cases, rte_errno is set to -errno.

 lib/librte_eal/common/eal_common_proc.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/lib/librte_eal/common/eal_common_proc.c 
b/lib/librte_eal/common/eal_common_proc.c
index b974837..caa8774 100644
--- a/lib/librte_eal/common/eal_common_proc.c
+++ b/lib/librte_eal/common/eal_common_proc.c
@@ -131,16 +131,16 @@ validate_action_name(const char *name)
 {
        if (name == NULL) {
                RTE_LOG(ERR, EAL, "Action name cannot be NULL\n");
-               rte_errno = -EINVAL;
+               rte_errno = EINVAL;
                return -1;
        }
        if (strnlen(name, RTE_MP_MAX_NAME_LEN) == 0) {
                RTE_LOG(ERR, EAL, "Length of action name is zero\n");
-               rte_errno = -EINVAL;
+               rte_errno = EINVAL;
                return -1;
        }
        if (strnlen(name, RTE_MP_MAX_NAME_LEN) == RTE_MP_MAX_NAME_LEN) {
-               rte_errno = -E2BIG;
+               rte_errno = E2BIG;
                return -1;
        }
        return 0;
@@ -156,7 +156,7 @@ rte_mp_action_register(const char *name, rte_mp_t action)
 
        entry = malloc(sizeof(struct action_entry));
        if (entry == NULL) {
-               rte_errno = -ENOMEM;
+               rte_errno = ENOMEM;
                return -1;
        }
        strcpy(entry->action_name, name);
@@ -165,7 +165,7 @@ rte_mp_action_register(const char *name, rte_mp_t action)
        pthread_mutex_lock(&mp_mutex_action);
        if (find_action_entry_by_name(name) != NULL) {
                pthread_mutex_unlock(&mp_mutex_action);
-               rte_errno = -EEXIST;
+               rte_errno = EEXIST;
                free(entry);
                return -1;
        }
@@ -505,7 +505,7 @@ check_input(const struct rte_mp_msg *msg)
 {
        if (msg == NULL) {
                RTE_LOG(ERR, EAL, "Msg cannot be NULL\n");
-               rte_errno = -EINVAL;
+               rte_errno = EINVAL;
                return false;
        }
 
@@ -514,14 +514,14 @@ check_input(const struct rte_mp_msg *msg)
 
        if (msg->len_param > RTE_MP_MAX_PARAM_LEN) {
                RTE_LOG(ERR, EAL, "Message data is too long\n");
-               rte_errno = -E2BIG;
+               rte_errno = E2BIG;
                return false;
        }
 
        if (msg->num_fds > RTE_MP_MAX_FD_NUM) {
                RTE_LOG(ERR, EAL, "Cannot send more than %d FDs\n",
                        RTE_MP_MAX_FD_NUM);
-               rte_errno = -E2BIG;
+               rte_errno = E2BIG;
                return false;
        }
 
@@ -560,7 +560,7 @@ mp_request_one(const char *dst, struct rte_mp_msg *req,
        pthread_mutex_unlock(&sync_requests.lock);
        if (exist) {
                RTE_LOG(ERR, EAL, "A pending request %s:%s\n", dst, req->name);
-               rte_errno = -EEXIST;
+               rte_errno = EEXIST;
                return -1;
        }
 
@@ -596,7 +596,7 @@ mp_request_one(const char *dst, struct rte_mp_msg *req,
        if (sync_req.reply_received == 0) {
                RTE_LOG(ERR, EAL, "Fail to recv reply for request %s:%s\n",
                        dst, req->name);
-               rte_errno = -ETIMEDOUT;
+               rte_errno = ETIMEDOUT;
                return -1;
        }
 
@@ -604,7 +604,7 @@ mp_request_one(const char *dst, struct rte_mp_msg *req,
        if (!tmp) {
                RTE_LOG(ERR, EAL, "Fail to alloc reply for request %s:%s\n",
                        dst, req->name);
-               rte_errno = -ENOMEM;
+               rte_errno = ENOMEM;
                return -1;
        }
        memcpy(&tmp[reply->nb_received], &msg, sizeof(msg));
@@ -676,7 +676,7 @@ rte_mp_reply(struct rte_mp_msg *msg, const char *peer)
 
        if (peer == NULL) {
                RTE_LOG(ERR, EAL, "peer is not specified\n");
-               rte_errno = -EINVAL;
+               rte_errno = EINVAL;
                return -1;
        }
 
-- 
2.7.4