Re: [dpdk-dev] [PATCH 05/40] net/virtio: move PCI device init in dedicated file
From: David Marchand <hidden>
Date: 2021-01-05 21:19:26
On Sun, Dec 20, 2020 at 10:14 PM Maxime Coquelin [off-list ref] wrote:
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diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c index 99a5a1bb88..ca21a019e5 100644 --- a/drivers/net/virtio/virtio_ethdev.c +++ b/drivers/net/virtio/virtio_ethdev.c
[...]
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@@ -2135,52 +2078,7 @@ virtio_dev_devargs_parse(struct rte_devargs *devargs, int *vdpa, return ret; } -static int eth_virtio_pci_probe(struct rte_pci_driver *pci_drv __rte_unused, - struct rte_pci_device *pci_dev) -{ - int vdpa = 0; - int ret = 0; - - ret = virtio_dev_devargs_parse(pci_dev->device.devargs, &vdpa, NULL, - NULL); - if (ret < 0) { - PMD_INIT_LOG(ERR, "devargs parsing is failed"); - return ret; - } - /* virtio pmd skips probe if device needs to work in vdpa mode */ - if (vdpa == 1) - return 1; - - return rte_eth_dev_pci_generic_probe(pci_dev, sizeof(struct virtio_pci_dev), - eth_virtio_dev_init); -} - -static int eth_virtio_pci_remove(struct rte_pci_device *pci_dev) -{ - int ret; - - ret = rte_eth_dev_pci_generic_remove(pci_dev, eth_virtio_dev_uninit); - /* Port has already been released by close. */ - if (ret == -ENODEV) - ret = 0; - return ret; -} - -static struct rte_pci_driver rte_virtio_pmd = { - .driver = { - .name = "net_virtio", - }, - .id_table = pci_id_virtio_map, - .drv_flags = 0, - .probe = eth_virtio_pci_probe, - .remove = eth_virtio_pci_remove, -}; -RTE_INIT(rte_virtio_pmd_init) -{ - rte_eal_iopl_init(); - rte_pci_register(&rte_virtio_pmd); -}
Leaving three empty lines if I count correctly.
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static bool rx_offload_enabled(struct virtio_hw *hw)@@ -2521,7 +2419,7 @@ static void virtio_dev_free_mbufs(struct rte_eth_dev *dev) /* * Stop device: disable interrupt and mark link down */ -static int +int virtio_dev_stop(struct rte_eth_dev *dev) { struct virtio_hw *hw = dev->data->dev_private;@@ -2673,7 +2571,5 @@ __rte_unused uint8_t is_rx) } RTE_PMD_EXPORT_NAME(net_virtio, __COUNTER__);
This belongs with the rest of the pci driver declarations. $ ./usertools/dpdk-pmdinfo.py $HOME/builds/build-gcc-shared/drivers/librte_net_virtio.so PMD NAME: net_virtio_user PMD PARAMETERS: path=<path> mac=<mac addr> cq=<int> queue_size=<int> queues=<int> iface=<string> server=<0|1> mrg_rxbuf=<0|1> in_order=<0|1> packed_vq=<0|1> speed=<int> vectorized=<0|1> PMD NAME: net_virtio ^^^ Here, I would expect the pci table and the kmod dependencies. This makes me realise that the net_virtio_user driver is not exported (but it seems to work without it.. interesting).
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-RTE_PMD_REGISTER_PCI_TABLE(net_virtio, pci_id_virtio_map); -RTE_PMD_REGISTER_KMOD_DEP(net_virtio, "* igb_uio | uio_pci_generic | vfio-pci"); RTE_LOG_REGISTER(virtio_logtype_init, pmd.net.virtio.init, NOTICE); RTE_LOG_REGISTER(virtio_logtype_driver, pmd.net.virtio.driver, NOTICE);diff --git a/drivers/net/virtio/virtio_ethdev.h b/drivers/net/virtio/virtio_ethdev.h index b7d52d497f..13395937c8 100644 --- a/drivers/net/virtio/virtio_ethdev.h +++ b/drivers/net/virtio/virtio_ethdev.h@@ -117,6 +117,8 @@ void virtio_interrupt_handler(void *param); int virtio_dev_pause(struct rte_eth_dev *dev); void virtio_dev_resume(struct rte_eth_dev *dev); +int virtio_dev_stop(struct rte_eth_dev *dev); +int virtio_dev_close(struct rte_eth_dev *dev); int virtio_inject_pkts(struct rte_eth_dev *dev, struct rte_mbuf **tx_pkts, int nb_pkts);diff --git a/drivers/net/virtio/virtio_pci_ethdev.c b/drivers/net/virtio/virtio_pci_ethdev.c new file mode 100644 index 0000000000..9c0935068e --- /dev/null +++ b/drivers/net/virtio/virtio_pci_ethdev.c@@ -0,0 +1,148 @@ +/* SPDX-License-Identifier: BSD-3-Clause + * Copyright(c) 2010-2016 Intel Corporation + */ + +#include <stdint.h> +#include <string.h> +#include <stdio.h> +#include <errno.h> +#include <unistd.h> + +#include <rte_ethdev_driver.h> +#include <rte_ethdev_pci.h> +#include <rte_pci.h> +#include <rte_bus_pci.h> +#include <rte_errno.h> + +#include <rte_memory.h> +#include <rte_eal.h> +#include <rte_dev.h> +#include <rte_kvargs.h> + +#include "virtio_ethdev.h" +#include "virtio_pci.h" +#include "virtio_logs.h" + +/* + * The set of PCI devices this driver supports + */ +static const struct rte_pci_id pci_id_virtio_map[] = { + { RTE_PCI_DEVICE(VIRTIO_PCI_VENDORID, VIRTIO_PCI_LEGACY_DEVICEID_NET) }, + { RTE_PCI_DEVICE(VIRTIO_PCI_VENDORID, VIRTIO_PCI_MODERN_DEVICEID_NET) }, + { .vendor_id = 0, /* sentinel */ }, +}; + +static int +eth_virtio_pci_init(struct rte_eth_dev *eth_dev) +{ + return eth_virtio_dev_init(eth_dev); +} + +static int +eth_virtio_pci_uninit(struct rte_eth_dev *eth_dev) +{ + int ret; + PMD_INIT_FUNC_TRACE(); + + if (rte_eal_process_type() == RTE_PROC_SECONDARY) + return 0; + + ret = virtio_dev_stop(eth_dev); + virtio_dev_close(eth_dev); + + PMD_INIT_LOG(DEBUG, "dev_uninit completed"); + + return ret; +} + +static int vdpa_check_handler(__rte_unused const char *key, + const char *value, void *ret_val) +{ + if (strcmp(value, "1") == 0) + *(int *)ret_val = 1; + else + *(int *)ret_val = 0; + + return 0; +} + +#define VIRTIO_ARG_VDPA "vdpa" + +static int +virtio_pci_devargs_parse(struct rte_devargs *devargs, int *vdpa) +{ + struct rte_kvargs *kvlist; + int ret = 0; + + if (devargs == NULL) + return 0; + + kvlist = rte_kvargs_parse(devargs->args, NULL); + if (kvlist == NULL) { + PMD_INIT_LOG(ERR, "error when parsing param"); + return 0; + } + + if (vdpa && rte_kvargs_count(kvlist, VIRTIO_ARG_VDPA) == 1) {
I would remove this check on vdpa pointer being NULL, as it gets passed on the stack by a single caller in this file.
+ /* vdpa mode selected when there's a key-value pair:
+ * vdpa=1
+ */
+ ret = rte_kvargs_process(kvlist, VIRTIO_ARG_VDPA,
+ vdpa_check_handler, vdpa);
+ if (ret < 0)
+ PMD_INIT_LOG(ERR, "Failed to parse %s", VIRTIO_ARG_VDPA);
+ }
+
+ rte_kvargs_free(kvlist);
+
+ return ret;
+}
+
+static int eth_virtio_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
+ struct rte_pci_device *pci_dev)
+{
+ int vdpa = 0;
+ int ret = 0;
+
+ ret = virtio_pci_devargs_parse(pci_dev->device.devargs, &vdpa);
+ if (ret < 0) {
+ PMD_INIT_LOG(ERR, "devargs parsing is failed");
+ return ret;
+ }
+ /* virtio pmd skips probe if device needs to work in vdpa mode */
+ if (vdpa == 1)
+ return 1;
+
+ return rte_eth_dev_pci_generic_probe(pci_dev, sizeof(struct virtio_pci_dev),
+ eth_virtio_pci_init);
+}
+
+static int eth_virtio_pci_remove(struct rte_pci_device *pci_dev)
+{
+ int ret;
+
+ ret = rte_eth_dev_pci_generic_remove(pci_dev, eth_virtio_pci_uninit);
+ /* Port has already been released by close. */
+ if (ret == -ENODEV)
+ ret = 0;
+ return ret;
+}
+
+static struct rte_pci_driver rte_virtio_pmd = {This seems too generic. virtio_pci_pmd ?
+ .driver = {
+ .name = "net_virtio",
+ },
+ .id_table = pci_id_virtio_map,
+ .drv_flags = 0,
+ .probe = eth_virtio_pci_probe,
+ .remove = eth_virtio_pci_remove,
+};
+
+RTE_INIT(rte_virtio_pmd_init)virtio_pci_pmd_init ?
+{
+ rte_eal_iopl_init();
+ rte_pci_register(&rte_virtio_pmd);
+}
+
+RTE_PMD_REGISTER_PCI_TABLE(net_virtio, pci_id_virtio_map);
+RTE_PMD_REGISTER_KMOD_DEP(net_virtio, "* igb_uio | uio_pci_generic | vfio-pci");-- David Marchand