--- /dev/null
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2018 6WIND S.A.
+ * Copyright 2018 Mellanox Technologies, Ltd
+ */
+
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <unistd.h>
+
+#include "mlx5.h"
+#include "mlx5_utils.h"
+
+/* Size of the buffer to receive kernel messages */
+#define MLX5_NL_BUF_SIZE (32 * 1024)
+/* Send buffer size for the Netlink socket */
+#define MLX5_SEND_BUF_SIZE 32768
+/* Receive buffer size for the Netlink socket */
+#define MLX5_RECV_BUF_SIZE 32768
+
+/*
+ * Define NDA_RTA as defined in iproute2 sources.
+ *
+ * see in iproute2 sources file include/libnetlink.h
+ */
+#ifndef MLX5_NDA_RTA
+#define MLX5_NDA_RTA(r) \
+ ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
+#endif
+
+/* Add/remove MAC address through Netlink */
+struct mlx5_nl_mac_addr {
+ struct ether_addr (*mac)[];
+ /**< MAC address handled by the device. */
+ int mac_n; /**< Number of addresses in the array. */
+};
+
+/**
+ * Opens a Netlink socket.
+ *
+ * @param nl_groups
+ * Netlink group value (e.g. RTMGRP_LINK).
+ *
+ * @return
+ * A file descriptor on success, a negative errno value otherwise and
+ * rte_errno is set.
+ */
+int
+mlx5_nl_init(uint32_t nl_groups)
+{
+ int fd;
+ int sndbuf_size = MLX5_SEND_BUF_SIZE;
+ int rcvbuf_size = MLX5_RECV_BUF_SIZE;
+ struct sockaddr_nl local = {
+ .nl_family = AF_NETLINK,
+ .nl_groups = nl_groups,
+ };
+ int ret;
+
+ fd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE);
+ if (fd == -1) {
+ rte_errno = errno;
+ return -rte_errno;
+ }
+ ret = setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &sndbuf_size, sizeof(int));
+ if (ret == -1) {
+ rte_errno = errno;
+ goto error;
+ }
+ ret = setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf_size, sizeof(int));
+ if (ret == -1) {
+ rte_errno = errno;
+ goto error;
+ }
+ ret = bind(fd, (struct sockaddr *)&local, sizeof(local));
+ if (ret == -1) {
+ rte_errno = errno;
+ goto error;
+ }
+ return fd;
+error:
+ close(fd);
+ return -rte_errno;
+}
+
+/**
+ * Send a request message to the kernel on the Netlink socket.
+ *
+ * @param[in] nlsk_fd
+ * Netlink socket file descriptor.
+ * @param[in] nh
+ * The Netlink message send to the kernel.
+ * @param[in] ssn
+ * Sequence number.
+ * @param[in] req
+ * Pointer to the request structure.
+ * @param[in] len
+ * Length of the request in bytes.
+ *
+ * @return
+ * The number of sent bytes on success, a negative errno value otherwise and
+ * rte_errno is set.
+ */
+static int
+mlx5_nl_request(int nlsk_fd, struct nlmsghdr *nh, uint32_t sn, void *req,
+ int len)
+{
+ struct sockaddr_nl sa = {
+ .nl_family = AF_NETLINK,
+ };
+ struct iovec iov[2] = {
+ { .iov_base = nh, .iov_len = sizeof(*nh), },
+ { .iov_base = req, .iov_len = len, },
+ };
+ struct msghdr msg = {
+ .msg_name = &sa,
+ .msg_namelen = sizeof(sa),
+ .msg_iov = iov,
+ .msg_iovlen = 2,
+ };
+ int send_bytes;
+
+ nh->nlmsg_pid = 0; /* communication with the kernel uses pid 0 */
+ nh->nlmsg_seq = sn;
+ send_bytes = sendmsg(nlsk_fd, &msg, 0);
+ if (send_bytes < 0) {
+ rte_errno = errno;
+ return -rte_errno;
+ }
+ return send_bytes;
+}
+
+/**
+ * Send a message to the kernel on the Netlink socket.
+ *
+ * @param[in] nlsk_fd
+ * The Netlink socket file descriptor used for communication.
+ * @param[in] nh
+ * The Netlink message send to the kernel.
+ * @param[in] sn
+ * Sequence number.
+ *
+ * @return
+ * The number of sent bytes on success, a negative errno value otherwise and
+ * rte_errno is set.
+ */
+static int
+mlx5_nl_send(int nlsk_fd, struct nlmsghdr *nh, uint32_t sn)
+{
+ struct sockaddr_nl sa = {
+ .nl_family = AF_NETLINK,
+ };
+ struct iovec iov = {
+ .iov_base = nh,
+ .iov_len = nh->nlmsg_len,
+ };
+ struct msghdr msg = {
+ .msg_name = &sa,
+ .msg_namelen = sizeof(sa),
+ .msg_iov = &iov,
+ .msg_iovlen = 1,
+ };
+ int send_bytes;
+
+ nh->nlmsg_pid = 0; /* communication with the kernel uses pid 0 */
+ nh->nlmsg_seq = sn;
+ send_bytes = sendmsg(nlsk_fd, &msg, 0);
+ if (send_bytes < 0) {
+ rte_errno = errno;
+ return -rte_errno;
+ }
+ return send_bytes;
+}
+
+/**
+ * Receive a message from the kernel on the Netlink socket, following
+ * mlx5_nl_send().
+ *
+ * @param[in] nlsk_fd
+ * The Netlink socket file descriptor used for communication.
+ * @param[in] sn
+ * Sequence number.
+ * @param[in] cb
+ * The callback function to call for each Netlink message received.
+ * @param[in, out] arg
+ * Custom arguments for the callback.
+ *
+ * @return
+ * 0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+static int
+mlx5_nl_recv(int nlsk_fd, uint32_t sn, int (*cb)(struct nlmsghdr *, void *arg),
+ void *arg)
+{
+ struct sockaddr_nl sa;
+ char buf[MLX5_RECV_BUF_SIZE];
+ struct iovec iov = {
+ .iov_base = buf,
+ .iov_len = sizeof(buf),
+ };
+ struct msghdr msg = {
+ .msg_name = &sa,
+ .msg_namelen = sizeof(sa),
+ .msg_iov = &iov,
+ /* One message at a time */
+ .msg_iovlen = 1,
+ };
+ int multipart = 0;
+ int ret = 0;
+
+ do {
+ struct nlmsghdr *nh;
+ int recv_bytes = 0;
+
+ do {
+ recv_bytes = recvmsg(nlsk_fd, &msg, 0);
+ if (recv_bytes == -1) {
+ rte_errno = errno;
+ return -rte_errno;
+ }
+ nh = (struct nlmsghdr *)buf;
+ } while (nh->nlmsg_seq != sn);
+ for (;
+ NLMSG_OK(nh, (unsigned int)recv_bytes);
+ nh = NLMSG_NEXT(nh, recv_bytes)) {
+ if (nh->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr *err_data = NLMSG_DATA(nh);
+
+ if (err_data->error < 0) {
+ rte_errno = -err_data->error;
+ return -rte_errno;
+ }
+ /* Ack message. */
+ return 0;
+ }
+ /* Multi-part msgs and their trailing DONE message. */
+ if (nh->nlmsg_flags & NLM_F_MULTI) {
+ if (nh->nlmsg_type == NLMSG_DONE)
+ return 0;
+ multipart = 1;
+ }
+ if (cb) {
+ ret = cb(nh, arg);
+ if (ret < 0)
+ return ret;
+ }
+ }
+ } while (multipart);
+ return ret;
+}
+
+/**
+ * Parse Netlink message to retrieve the bridge MAC address.
+ *
+ * @param nh
+ * Pointer to Netlink Message Header.
+ * @param arg
+ * PMD data register with this callback.
+ *
+ * @return
+ * 0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+static int
+mlx5_nl_mac_addr_cb(struct nlmsghdr *nh, void *arg)
+{
+ struct mlx5_nl_mac_addr *data = arg;
+ struct ndmsg *r = NLMSG_DATA(nh);
+ struct rtattr *attribute;
+ int len;
+
+ len = nh->nlmsg_len - NLMSG_LENGTH(sizeof(*r));
+ for (attribute = MLX5_NDA_RTA(r);
+ RTA_OK(attribute, len);
+ attribute = RTA_NEXT(attribute, len)) {
+ if (attribute->rta_type == NDA_LLADDR) {
+ if (data->mac_n == MLX5_MAX_MAC_ADDRESSES) {
+ DRV_LOG(WARNING,
+ "not enough room to finalize the"
+ " request");
+ rte_errno = ENOMEM;
+ return -rte_errno;
+ }
+#ifndef NDEBUG
+ char m[18];
+
+ ether_format_addr(m, 18, RTA_DATA(attribute));
+ DRV_LOG(DEBUG, "bridge MAC address %s", m);
+#endif
+ memcpy(&(*data->mac)[data->mac_n++],
+ RTA_DATA(attribute), ETHER_ADDR_LEN);
+ }
+ }
+ return 0;
+}
+
+/**
+ * Get bridge MAC addresses.
+ *
+ * @param dev
+ * Pointer to Ethernet device.
+ * @param mac[out]
+ * Pointer to the array table of MAC addresses to fill.
+ * Its size should be of MLX5_MAX_MAC_ADDRESSES.
+ * @param mac_n[out]
+ * Number of entries filled in MAC array.
+ *
+ * @return
+ * 0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+static int
+mlx5_nl_mac_addr_list(struct rte_eth_dev *dev, struct ether_addr (*mac)[],
+ int *mac_n)
+{
+ struct priv *priv = dev->data->dev_private;
+ int iface_idx = mlx5_ifindex(dev);
+ struct {
+ struct nlmsghdr hdr;
+ struct ifinfomsg ifm;
+ } req = {
+ .hdr = {
+ .nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
+ .nlmsg_type = RTM_GETNEIGH,
+ .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ },
+ .ifm = {
+ .ifi_family = PF_BRIDGE,
+ .ifi_index = iface_idx,
+ },
+ };
+ struct mlx5_nl_mac_addr data = {
+ .mac = mac,
+ .mac_n = 0,
+ };
+ int fd;
+ int ret;
+ uint32_t sn = priv->nl_sn++;
+
+ if (priv->nl_socket == -1)
+ return 0;
+ fd = priv->nl_socket;
+ ret = mlx5_nl_request(fd, &req.hdr, sn, &req.ifm,
+ sizeof(struct ifinfomsg));
+ if (ret < 0)
+ goto error;
+ ret = mlx5_nl_recv(fd, sn, mlx5_nl_mac_addr_cb, &data);
+ if (ret < 0)
+ goto error;
+ *mac_n = data.mac_n;
+ return 0;
+error:
+ DRV_LOG(DEBUG, "port %u cannot retrieve MAC address list %s",
+ dev->data->port_id, strerror(rte_errno));
+ return -rte_errno;
+}
+
+/**
+ * Modify the MAC address neighbour table with Netlink.
+ *
+ * @param dev
+ * Pointer to Ethernet device.
+ * @param mac
+ * MAC address to consider.
+ * @param add
+ * 1 to add the MAC address, 0 to remove the MAC address.
+ *
+ * @return
+ * 0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+static int
+mlx5_nl_mac_addr_modify(struct rte_eth_dev *dev, struct ether_addr *mac,
+ int add)
+{
+ struct priv *priv = dev->data->dev_private;
+ int iface_idx = mlx5_ifindex(dev);
+ struct {
+ struct nlmsghdr hdr;
+ struct ndmsg ndm;
+ struct rtattr rta;
+ uint8_t buffer[ETHER_ADDR_LEN];
+ } req = {
+ .hdr = {
+ .nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),
+ .nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE |
+ NLM_F_EXCL | NLM_F_ACK,
+ .nlmsg_type = add ? RTM_NEWNEIGH : RTM_DELNEIGH,
+ },
+ .ndm = {
+ .ndm_family = PF_BRIDGE,
+ .ndm_state = NUD_NOARP | NUD_PERMANENT,
+ .ndm_ifindex = iface_idx,
+ .ndm_flags = NTF_SELF,
+ },
+ .rta = {
+ .rta_type = NDA_LLADDR,
+ .rta_len = RTA_LENGTH(ETHER_ADDR_LEN),
+ },
+ };
+ int fd;
+ int ret;
+ uint32_t sn = priv->nl_sn++;
+
+ if (priv->nl_socket == -1)
+ return 0;
+ fd = priv->nl_socket;
+ memcpy(RTA_DATA(&req.rta), mac, ETHER_ADDR_LEN);
+ req.hdr.nlmsg_len = NLMSG_ALIGN(req.hdr.nlmsg_len) +
+ RTA_ALIGN(req.rta.rta_len);
+ ret = mlx5_nl_send(fd, &req.hdr, sn);
+ if (ret < 0)
+ goto error;
+ ret = mlx5_nl_recv(fd, sn, NULL, NULL);
+ if (ret < 0)
+ goto error;
+ return 0;
+error:
+ DRV_LOG(DEBUG,
+ "port %u cannot %s MAC address %02X:%02X:%02X:%02X:%02X:%02X"
+ " %s",
+ dev->data->port_id,
+ add ? "add" : "remove",
+ mac->addr_bytes[0], mac->addr_bytes[1],
+ mac->addr_bytes[2], mac->addr_bytes[3],
+ mac->addr_bytes[4], mac->addr_bytes[5],
+ strerror(rte_errno));
+ return -rte_errno;
+}
+
+/**
+ * Add a MAC address.
+ *
+ * @param dev
+ * Pointer to Ethernet device.
+ * @param mac
+ * MAC address to register.
+ * @param index
+ * MAC address index.
+ *
+ * @return
+ * 0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+int
+mlx5_nl_mac_addr_add(struct rte_eth_dev *dev, struct ether_addr *mac,
+ uint32_t index)
+{
+ struct priv *priv = dev->data->dev_private;
+ int ret;
+
+ ret = mlx5_nl_mac_addr_modify(dev, mac, 1);
+ if (!ret)
+ BITFIELD_SET(priv->mac_own, index);
+ if (ret == -EEXIST)
+ return 0;
+ return ret;
+}
+
+/**
+ * Remove a MAC address.
+ *
+ * @param dev
+ * Pointer to Ethernet device.
+ * @param mac
+ * MAC address to remove.
+ * @param index
+ * MAC address index.
+ *
+ * @return
+ * 0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+int
+mlx5_nl_mac_addr_remove(struct rte_eth_dev *dev, struct ether_addr *mac,
+ uint32_t index)
+{
+ struct priv *priv = dev->data->dev_private;
+
+ BITFIELD_RESET(priv->mac_own, index);
+ return mlx5_nl_mac_addr_modify(dev, mac, 0);
+}
+
+/**
+ * Synchronize Netlink bridge table to the internal table.
+ *
+ * @param dev
+ * Pointer to Ethernet device.
+ */
+void
+mlx5_nl_mac_addr_sync(struct rte_eth_dev *dev)
+{
+ struct ether_addr macs[MLX5_MAX_MAC_ADDRESSES];
+ int macs_n = 0;
+ int i;
+ int ret;
+
+ ret = mlx5_nl_mac_addr_list(dev, &macs, &macs_n);
+ if (ret)
+ return;
+ for (i = 0; i != macs_n; ++i) {
+ int j;
+
+ /* Verify the address is not in the array yet. */
+ for (j = 0; j != MLX5_MAX_MAC_ADDRESSES; ++j)
+ if (is_same_ether_addr(&macs[i],
+ &dev->data->mac_addrs[j]))
+ break;
+ if (j != MLX5_MAX_MAC_ADDRESSES)
+ continue;
+ /* Find the first entry available. */
+ for (j = 0; j != MLX5_MAX_MAC_ADDRESSES; ++j) {
+ if (is_zero_ether_addr(&dev->data->mac_addrs[j])) {
+ dev->data->mac_addrs[j] = macs[i];
+ break;
+ }
+ }
+ }
+}
+
+/**
+ * Flush all added MAC addresses.
+ *
+ * @param dev
+ * Pointer to Ethernet device.
+ */
+void
+mlx5_nl_mac_addr_flush(struct rte_eth_dev *dev)
+{
+ struct priv *priv = dev->data->dev_private;
+ int i;
+
+ for (i = MLX5_MAX_MAC_ADDRESSES - 1; i >= 0; --i) {
+ struct ether_addr *m = &dev->data->mac_addrs[i];
+
+ if (BITFIELD_ISSET(priv->mac_own, i))
+ mlx5_nl_mac_addr_remove(dev, m, i);
+ }
+}
git.droids-corp.org / dpdk.git / commitdiff