Hi Maryam,
I have replied inline.
Regards,
Shibin
From: Maryam Tahhan <mtah...@redhat.com>
Sent: Thursday, November 30, 2023 12:33 PM
To: Koikkara Reeny, Shibin <shibin.koikkara.re...@intel.com>;
ferruh.yi...@amd.com; step...@networkplumber.org; lihuis...@huawei.com;
fengcheng...@huawei.com; liuyongl...@huawei.com
Cc: dev@dpdk.org
Subject: Re: [v1] net/af_xdp: enable a sock path alongside use_cni
Hi Shibin
Thanks for the review. Comments inline.
BR
Maryam
On 30/11/2023 12:14, Koikkara Reeny, Shibin wrote:
Hi Maryam,
I have added some suggestion below.
Regrads,
Shibin
[snip]
NOTICE);
#define UDS_MAX_CMD_LEN 64
#define UDS_MAX_CMD_RESP 128
#define UDS_XSK_MAP_FD_MSG "/xsk_map_fd"
-#define UDS_SOCK "/tmp/afxdp.sock"
#define UDS_CONNECT_MSG "/connect"
#define UDS_HOST_OK_MSG "/host_ok"
#define UDS_HOST_NAK_MSG "/host_nak"
@@ -171,6 +170,7 @@ struct pmd_internals {
bool custom_prog_configured;
bool force_copy;
bool use_cni;
+ char sock_path[PATH_MAX];
I would recommend using variable name as "uds_path".
No issues in renaming
struct bpf_map *map;
struct rte_ether_addr eth_addr;
@@ -191,6 +191,7 @@ struct pmd_process_private {
#define ETH_AF_XDP_BUDGET_ARG "busy_budget"
#define ETH_AF_XDP_FORCE_COPY_ARG "force_copy"
#define ETH_AF_XDP_USE_CNI_ARG "use_cni"
+#define ETH_AF_XDP_SOCK_ARG "sock"
To make it clear would recommend using "sock_path" and also
ETH_AF_XDP_CNI_UDS_PATH_ARG or ETH_AF_XDP_SOCK_PATH_ARG
No issues in renaming
.
static const char * const valid_arguments[] = {
ETH_AF_XDP_IFACE_ARG,
@@ -201,6 +202,7 @@ static const char * const valid_arguments[] = {
ETH_AF_XDP_BUDGET_ARG,
ETH_AF_XDP_FORCE_COPY_ARG,
ETH_AF_XDP_USE_CNI_ARG,
+ ETH_AF_XDP_SOCK_ARG,
NULL
};
@@ -1351,7 +1353,7 @@ configure_preferred_busy_poll(struct
pkt_rx_queue *rxq) }
static int
-init_uds_sock(struct sockaddr_un *server)
+init_uds_sock(struct sockaddr_un *server, const char *sock_path)
{
int sock;
@@ -1362,7 +1364,7 @@ init_uds_sock(struct sockaddr_un *server)
}
server->sun_family = AF_UNIX;
- strlcpy(server->sun_path, UDS_SOCK, sizeof(server->sun_path));
+ strlcpy(server->sun_path, sock_path, sizeof(server->sun_path));
if (connect(sock, (struct sockaddr *)server, sizeof(struct
sockaddr_un)) < 0) {
close(sock);
@@ -1382,7 +1384,7 @@ struct msg_internal { };
static int
-send_msg(int sock, char *request, int *fd)
+send_msg(int sock, char *request, int *fd, const char *sock_path)
{
int snd;
struct iovec iov;
@@ -1393,7 +1395,7 @@ send_msg(int sock, char *request, int *fd)
memset(&dst, 0, sizeof(dst));
dst.sun_family = AF_UNIX;
- strlcpy(dst.sun_path, UDS_SOCK, sizeof(dst.sun_path));
+ strlcpy(dst.sun_path, sock_path, sizeof(dst.sun_path));
/* Initialize message header structure */
memset(&msgh, 0, sizeof(msgh));
@@ -1471,7 +1473,7 @@ read_msg(int sock, char *response, struct
sockaddr_un *s, int *fd)
static int
make_request_cni(int sock, struct sockaddr_un *server, char *request,
- int *req_fd, char *response, int *out_fd)
+ int *req_fd, char *response, int *out_fd, const char
*sock_path)
{
int rval;
@@ -1483,7 +1485,7 @@ make_request_cni(int sock, struct sockaddr_un
*server, char *request,
if (req_fd == NULL)
rval = write(sock, request, strlen(request));
else
- rval = send_msg(sock, request, req_fd);
+ rval = send_msg(sock, request, req_fd, sock_path);
if (rval < 0) {
AF_XDP_LOG(ERR, "Write error %s\n", strerror(errno)); @@
-1507,7 +1509,7 @@ check_response(char *response, char *exp_resp, long
size) }
static int
-get_cni_fd(char *if_name)
+get_cni_fd(char *if_name, const char *sock_path)
{
char request[UDS_MAX_CMD_LEN],
response[UDS_MAX_CMD_RESP];
char hostname[MAX_LONG_OPT_SZ],
exp_resp[UDS_MAX_CMD_RESP]; @@ -1520,14 +1522,14 @@
get_cni_fd(char *if_name)
return -1;
memset(&server, 0, sizeof(server));
- sock = init_uds_sock(&server);
+ sock = init_uds_sock(&server, sock_path);
if (sock < 0)
return -1;
/* Initiates handshake to CNI send: /connect,hostname */
snprintf(request, sizeof(request), "%s,%s", UDS_CONNECT_MSG,
hostname);
memset(response, 0, sizeof(response));
- if (make_request_cni(sock, &server, request, NULL, response,
&out_fd) < 0) {
+ if (make_request_cni(sock, &server, request, NULL, response,
&out_fd,
+sock_path) < 0) {
Why do we need to pass "sock_path" here as we have already connected the sock
with sock_path in init_uds_sock()?
it's used in the send_msg() function inside make_request_cni(). In the original
implementation of send_msg used a #defined value which is why it wasn't needed
before. so as far as I can tell send_msg still needs that path. but I'm open to
suggestions.
Sorry my mistake. You will need to pass the argument.
AF_XDP_LOG(ERR, "Error in processing cmd [%s]\n",
request);
goto err_close;
}
@@ -1541,7 +1543,7 @@ get_cni_fd(char *if_name)
/* Request for "/version" */
strlcpy(request, UDS_VERSION_MSG, UDS_MAX_CMD_LEN);
memset(response, 0, sizeof(response));
- if (make_request_cni(sock, &server, request, NULL, response,
&out_fd) < 0) {
+ if (make_request_cni(sock, &server, request, NULL, response,
&out_fd,
+sock_path) < 0) {
Same question as above.
Please see previous ans
AF_XDP_LOG(ERR, "Error in processing cmd [%s]\n",
request);
goto err_close;
}
@@ -1549,7 +1551,7 @@ get_cni_fd(char *if_name)
/* Request for file descriptor for netdev name*/
snprintf(request, sizeof(request), "%s,%s",
UDS_XSK_MAP_FD_MSG, if_name);
memset(response, 0, sizeof(response));
- if (make_request_cni(sock, &server, request, NULL, response,
&out_fd) < 0) {
+ if (make_request_cni(sock, &server, request, NULL, response,
&out_fd,
+sock_path) < 0) {
Same question as above.
Please see previous ans
AF_XDP_LOG(ERR, "Error in processing cmd [%s]\n",
request);
goto err_close;
}
@@ -1571,7 +1573,7 @@ get_cni_fd(char *if_name)
/* Initiate close connection */
strlcpy(request, UDS_FIN_MSG, UDS_MAX_CMD_LEN);
memset(response, 0, sizeof(response));
- if (make_request_cni(sock, &server, request, NULL, response,
&out_fd) < 0) {
+ if (make_request_cni(sock, &server, request, NULL, response,
&out_fd,
+sock_path) < 0) {
Same question as above.
Please see previous ans
AF_XDP_LOG(ERR, "Error in processing cmd [%s]\n",
request);
goto err_close;
}
@@ -1698,7 +1700,7 @@ xsk_configure(struct pmd_internals *internals,
struct pkt_rx_queue *rxq,
int err, fd, map_fd;
/* get socket fd from CNI plugin */
- map_fd = get_cni_fd(internals->if_name);
+ map_fd = get_cni_fd(internals->if_name, internals-
sock_path);
if (map_fd < 0) {
AF_XDP_LOG(ERR, "Failed to receive CNI plugin
fd\n");
goto out_xsk;
@@ -2023,7 +2025,8 @@ xdp_get_channels_info(const char *if_name, int
*max_queues, static int parse_parameters(struct rte_kvargs *kvlist, char
*if_name, int *start_queue,
int *queue_cnt, int *shared_umem, char *prog_path,
- int *busy_budget, int *force_copy, int *use_cni)
+ int *busy_budget, int *force_copy, int *use_cni,
+ char *sock_path)
{
int ret;
@@ -2069,6 +2072,11 @@ parse_parameters(struct rte_kvargs *kvlist, char
*if_name, int *start_queue,
if (ret < 0)
goto free_kvlist;
+ ret = rte_kvargs_process(kvlist, ETH_AF_XDP_SOCK_ARG,
+ &parse_prog_arg, sock_path);
Parse_prog_arg does 2 things copy the sock_arg value and also check the access
to the socket.
Checking access here has a chance of causing raise condition so I would
recommend to skip this check here as this will be taken care in the
init_uds_sock().
If there's an issue here processing is abandoned. Is it not better to catch any
issue early on? I'm not sure I understand the race condition?
Race condition if af_xdp application pod start by a bit of out of sync before
the USD server thread start. So we can wait till the initialization process. It
is a suggestion.
+ if (ret < 0)
+ goto free_kvlist;
+
free_kvlist:
rte_kvargs_free(kvlist);
return ret;
@@ -2108,7 +2116,7 @@ static struct rte_eth_dev * init_internals(struct
rte_vdev_device *dev, const char *if_name,
int start_queue_idx, int queue_cnt, int shared_umem,
const char *prog_path, int busy_budget, int force_copy,
- int use_cni)
+ int use_cni, const char *sock_path)
{
const char *name = rte_vdev_device_name(dev);
const unsigned int numa_node = dev->device.numa_node; @@ -
2138,6 +2146,7 @@ init_internals(struct rte_vdev_device *dev, const char
*if_name,
internals->shared_umem = shared_umem;
internals->force_copy = force_copy;
internals->use_cni = use_cni;
+ strlcpy(internals->sock_path, sock_path, PATH_MAX);
if (xdp_get_channels_info(if_name, &internals->max_queue_cnt,
&internals->combined_queue_cnt)) { @@ -
2328,6 +2337,7 @@ rte_pmd_af_xdp_probe(struct rte_vdev_device *dev)
int busy_budget = -1, ret;
int force_copy = 0;
int use_cni = 0;
+ char sock_path[PATH_MAX] = {'\0'};
struct rte_eth_dev *eth_dev = NULL;
const char *name = rte_vdev_device_name(dev);
@@ -2370,7 +2380,7 @@ rte_pmd_af_xdp_probe(struct rte_vdev_device
*dev)
if (parse_parameters(kvlist, if_name, &xsk_start_queue_idx,
&xsk_queue_cnt, &shared_umem, prog_path,
- &busy_budget, &force_copy, &use_cni) < 0) {
+ &busy_budget, &force_copy, &use_cni,
sock_path) < 0) {
AF_XDP_LOG(ERR, "Invalid kvargs value\n");
return -EINVAL;
}
@@ -2387,6 +2397,13 @@ rte_pmd_af_xdp_probe(struct rte_vdev_device
*dev)
return -EINVAL;
}
+ if (use_cni && !strnlen(sock_path, PATH_MAX)) {
+ AF_XDP_LOG(ERR, "When '%s' parameter is used, '%s' must
also be provided\n",
+ ETH_AF_XDP_USE_CNI_ARG,
ETH_AF_XDP_SOCK_ARG);
+ return -EINVAL;
+ }
+
+
if (strlen(if_name) == 0) {
AF_XDP_LOG(ERR, "Network interface must be
specified\n");
return -EINVAL;
@@ -2410,7 +2427,7 @@ rte_pmd_af_xdp_probe(struct rte_vdev_device
*dev)
eth_dev = init_internals(dev, if_name, xsk_start_queue_idx,
xsk_queue_cnt, shared_umem, prog_path,
- busy_budget, force_copy, use_cni);
+ busy_budget, force_copy, use_cni,
sock_path);
if (eth_dev == NULL) {
AF_XDP_LOG(ERR, "Failed to init internals\n");
return -1;
@@ -2471,4 +2488,5 @@
RTE_PMD_REGISTER_PARAM_STRING(net_af_xdp,
"xdp_prog=<string> "
"busy_budget=<int> "
"force_copy=<int> "
- "use_cni=<int> ");
+ "use_cni=<int> "
+ "sock=<string> ");
--
2.41.0
