[dpdk-dev] [PATCH v3] net/memif: multi-process support
Burakov, Anatoly
anatoly.burakov at intel.com
Tue Jun 25 12:26:23 CEST 2019
On 25-Jun-19 11:05 AM, Jakub Grajciar wrote:
> Multi-process support for memif PMD.
> Primary process handles connection establishment.
> Secondary process queries for memory regions.
>
> Signed-off-by: Jakub Grajciar <jgrajcia at cisco.com>
> ---
<snip>
> +/* Message header to synchronize regions */
> +struct mp_region_msg {
> + char port_name[RTE_DEV_NAME_MAX_LEN];
> + memif_region_index_t idx;
> + memif_region_size_t size;
> +};
> +
> +static int
> +memif_mp_send_region(const struct rte_mp_msg *msg, const void *peer)
> +{
> + struct rte_eth_dev *dev;
> + struct pmd_process_private *proc_private;
> + const struct mp_region_msg *msg_param = (const struct mp_region_msg *)msg->param;
> + struct rte_mp_msg reply;
> + struct mp_region_msg *reply_param = (struct mp_region_msg *)reply.param;
> + uint16_t port_id;
> + int ret;
> +
> + /* Get requested port */
> + ret = rte_eth_dev_get_port_by_name(msg_param->port_name, &port_id);
> + if (ret) {
> + MIF_LOG(ERR, "Failed to get port id for %s",
> + msg_param->port_name);
> + return -1;
> + }
> + dev = &rte_eth_devices[port_id];
> + proc_private = dev->process_private;
> +
> + memset(&reply, 0, sizeof(reply));
> + strlcpy(reply.name, msg->name, sizeof(reply.name));
> + reply_param->idx = msg_param->idx;
> + if (proc_private->regions[msg_param->idx] != NULL) {
> + reply_param->size = proc_private->regions[msg_param->idx]->region_size;
> + reply.fds[0] = proc_private->regions[msg_param->idx]->fd;
> + reply.num_fds = 1;
> + }
> + reply.len_param = sizeof(*reply_param);
> + if (rte_mp_reply(&reply, peer) < 0) {
> + MIF_LOG(ERR, "Failed to reply to an add region request");
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * Request regions
> + * Called by secondary process, when ports link status goes up.
> + */
> +static int
> +memif_mp_request_regions(struct rte_eth_dev *dev)
> +{
> + int ret, i;
> + struct timespec timeout = {.tv_sec = 5, .tv_nsec = 0};
> + struct rte_mp_msg msg, *reply;
> + struct rte_mp_reply replies;
> + struct mp_region_msg *msg_param = (struct mp_region_msg *)msg.param;
> + struct mp_region_msg *reply_param;
> + struct memif_region *r;
> + struct pmd_process_private *proc_private = dev->process_private;
> +
> + MIF_LOG(DEBUG, "Requesting memory regions");
> +
> + for (i = 0; i < ETH_MEMIF_MAX_REGION_NUM; i++) {
> + /* Prepare the message */
> + memset(&msg, 0, sizeof(msg));
> + strlcpy(msg.name, MEMIF_MP_SEND_REGION, sizeof(msg.name));
> + strlcpy(msg_param->port_name, dev->data->name,
> + sizeof(msg_param->port_name));
> + msg_param->idx = i;
> + msg.len_param = sizeof(*msg_param);
> +
> + /* Send message */
> + ret = rte_mp_request_sync(&msg, &replies, &timeout);
> + if (ret < 0 || replies.nb_received != 1) {
> + MIF_LOG(ERR, "Failed to send mp msg: %d",
> + rte_errno);
> + return -1;
> + }
> +
> + reply = &replies.msgs[0];
> + reply_param = (struct mp_region_msg *)reply->param;
> +
> + if (reply_param->size > 0) {
> + r = rte_zmalloc("region", sizeof(struct memif_region), 0);
> + if (r == NULL) {
> + MIF_LOG(ERR, "Failed to alloc memif region.");
> + free(reply);
> + return -ENOMEM;
> + }
> + r->region_size = reply_param->size;
> + if (reply->num_fds < 1) {
> + MIF_LOG(ERR, "Missing file descriptor.");
> + free(reply);
> + return -1;
> + }
> + r->fd = reply->fds[0];
> + r->addr = NULL;
> +
> + proc_private->regions[reply_param->idx] = r;
> + proc_private->regions_num++;
> + }
> + free(reply);
> + }
> +
> + return memif_connect(dev);
> +}
> +
On the multiprocess/IPC part,
Acked-by: Anatoly Burakov <anatoly.burakov at intel.com>
Please bear in mind that i did not look at other sections of the code.
--
Thanks,
Anatoly
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