Thursday, June 14, 2018 11:35 AM, Adrien Mazarguil:
> Subject: [PATCH v2 3/7] net/mlx5: split PCI from generic probing code
>
> All the generic probing code needs is an IB device. While this device is
> currently supplied by a PCI lookup, other methods will be added soon.
>
> This patch divides the original function, which has become huge over time, as
> follows:
>
> 1. PCI-specific (mlx5_pci_probe()).
> 2. All ports of a Verbs device (mlx5_dev_spawn()).
> 3. A given port of a Verbs device (mlx5_dev_spawn_one()).
>
> (Patch based on prior work from Yuanhan Liu)
>
> Signed-off-by: Adrien Mazarguil <adrien.mazarg...@6wind.com>
> --
> v2 changes:
>
> - Fixed device naming. A port suffix is now appended only if several IB
> ports happen to be detected.
> - Added separate message to distinguish missing kernel drivers from other
> initialization errors, as it was confusing.
[...]
> +/**
> + * DPDK callback to register a PCI device.
> + *
> + * This function creates an Ethernet device for each port of a given
> + * PCI device.
> + *
> + * @param[in] pci_drv
> + * PCI driver structure (mlx5_driver).
> + * @param[in] pci_dev
> + * PCI device information.
> + *
> + * @return
> + * 0 on success, a negative errno value otherwise and rte_errno is set.
> + */
> +static int
> +mlx5_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
> + struct rte_pci_device *pci_dev) {
> + struct ibv_device **ibv_list;
> + struct rte_eth_dev **eth_list = NULL;
> + int vf;
> + int ret;
> +
> + assert(pci_drv == &mlx5_driver);
> + switch (pci_dev->id.device_id) {
> + case PCI_DEVICE_ID_MELLANOX_CONNECTX4VF:
> + case PCI_DEVICE_ID_MELLANOX_CONNECTX4LXVF:
> + case PCI_DEVICE_ID_MELLANOX_CONNECTX5VF:
> + case PCI_DEVICE_ID_MELLANOX_CONNECTX5EXVF:
> + vf = 1;
> + break;
> + default:
> + vf = 0;
> + }
Even though I couldn't find any functional bug, I think it is logically more
correct to determine if pci device is vf after we know this is Mellanox device.
Meaning the above block should be ...
> + errno = 0;
> + ibv_list = mlx5_glue->get_device_list(&ret);
> + if (!ibv_list) {
> + rte_errno = errno ? errno : ENOSYS;
> + DRV_LOG(ERR, "cannot list devices, is ib_uverbs loaded?");
> return -rte_errno;
> }
> - return 0;
> + while (ret-- > 0) {
> + struct rte_pci_addr pci_addr;
> +
> + DRV_LOG(DEBUG, "checking device \"%s\"", ibv_list[ret]-
> >name);
> + if (mlx5_ibv_device_to_pci_addr(ibv_list[ret], &pci_addr))
> + continue;
> + if (pci_dev->addr.domain != pci_addr.domain ||
> + pci_dev->addr.bus != pci_addr.bus ||
> + pci_dev->addr.devid != pci_addr.devid ||
> + pci_dev->addr.function != pci_addr.function)
> + continue;
> + DRV_LOG(INFO, "PCI information matches, using device
> \"%s\"",
> + ibv_list[ret]->name);
> + break;
> + }
Here.
> + if (ret >= 0)
> + eth_list = mlx5_dev_spawn(&pci_dev->device, ibv_list[ret],
> vf);
> + mlx5_glue->free_device_list(ibv_list);
> + if (!ret) {
> + DRV_LOG(WARNING,
> + "no Verbs device matches PCI device " PCI_PRI_FMT
> ","
> + " are kernel drivers loaded?",
> + pci_dev->addr.domain, pci_dev->addr.bus,
> + pci_dev->addr.devid, pci_dev->addr.function);
> + rte_errno = ENOENT;
> + ret = -rte_errno;
> + } else if (!eth_list || !*eth_list) {
> + DRV_LOG(ERR,
> + "probe of PCI device " PCI_PRI_FMT " aborted after"
> + " encountering an error: %s",
> + pci_dev->addr.domain, pci_dev->addr.bus,
> + pci_dev->addr.devid, pci_dev->addr.function,
> + strerror(rte_errno));
> + ret = -rte_errno;
> + } else {
> + for (ret = 0; eth_list[ret]; ++ret) {
> + rte_eth_copy_pci_info(eth_list[ret], pci_dev);
> + rte_eth_dev_probing_finish(eth_list[ret]);
> + }
> + ret = 0;
> + }
> + free(eth_list);
> + return ret;
> }
>
> static const struct rte_pci_id mlx5_pci_id_map[] = {
> --
> 2.11.0
