selftests/bpf: Implement set_hw_ring_size function to configure interface ring size

Introduce a new function called set_hw_ring_size that allows for the
dynamic configuration of the ring size within the interface.

Signed-off-by: Tushar Vyavahare <tushar.vyavahare@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20240402114529.545475-5-tushar.vyavahare@intel.com

diff --git a/tools/testing/selftests/bpf/network_helpers.c b/tools/testing/selftests/bpf/network_helpers.c
index 1cab200..04175e1 100644 (file)
--- a/tools/testing/selftests/bpf/network_helpers.c
+++ b/tools/testing/selftests/bpf/network_helpers.c
@@ -521,3 +521,27 @@ int get_hw_ring_size(char *ifname, struct ethtool_ringparam *ring_param)
        close(sockfd);
        return 0;
 }
+
+int set_hw_ring_size(char *ifname, struct ethtool_ringparam *ring_param)
+{
+       struct ifreq ifr = {0};
+       int sockfd, err;
+
+       sockfd = socket(AF_INET, SOCK_DGRAM, 0);
+       if (sockfd < 0)
+               return -errno;
+
+       memcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+
+       ring_param->cmd = ETHTOOL_SRINGPARAM;
+       ifr.ifr_data = (char *)ring_param;
+
+       if (ioctl(sockfd, SIOCETHTOOL, &ifr) < 0) {
+               err = errno;
+               close(sockfd);
+               return -err;
+       }
+
+       close(sockfd);
+       return 0;
+}

diff --git a/tools/testing/selftests/bpf/network_helpers.h b/tools/testing/selftests/bpf/network_helpers.h
index de4d27d..6457445 100644 (file)
--- a/tools/testing/selftests/bpf/network_helpers.h
+++ b/tools/testing/selftests/bpf/network_helpers.h
@@ -65,6 +65,7 @@ int make_sockaddr(int family, const char *addr_str, __u16 port,
 char *ping_command(int family);
 int get_socket_local_port(int sock_fd);
 int get_hw_ring_size(char *ifname, struct ethtool_ringparam *ring_param);
+int set_hw_ring_size(char *ifname, struct ethtool_ringparam *ring_param);
 
 struct nstoken;
 /**