Re: [PATCH net-next v2 10/14] sfc: implement filters for receiving traffic

From: Jason Wang
Date: Fri Mar 10 2023 - 00:07:11 EST

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On Tue, Mar 7, 2023 at 7:38 PM Gautam Dawar <gautam.dawar@xxxxxxx> wrote:
>
> Implement unicast, broadcast and unknown multicast
> filters for receiving different types of traffic.
>
> Signed-off-by: Gautam Dawar <gautam.dawar@xxxxxxx>
> ---
> drivers/net/ethernet/sfc/ef100_vdpa.c | 157 ++++++++++++++++++++++
> drivers/net/ethernet/sfc/ef100_vdpa.h | 36 ++++-
> drivers/net/ethernet/sfc/ef100_vdpa_ops.c | 17 ++-
> 3 files changed, 207 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/ethernet/sfc/ef100_vdpa.c b/drivers/net/ethernet/sfc/ef100_vdpa.c
> index 4ba57827a6cd..5c9f29f881a6 100644
> --- a/drivers/net/ethernet/sfc/ef100_vdpa.c
> +++ b/drivers/net/ethernet/sfc/ef100_vdpa.c
> @@ -16,12 +16,166 @@
> #include "mcdi_filters.h"
> #include "mcdi_functions.h"
> #include "ef100_netdev.h"
> +#include "filter.h"
> +#include "efx.h"
>
> +#define EFX_INVALID_FILTER_ID -1
> +
> +/* vDPA queues starts from 2nd VI or qid 1 */
> +#define EF100_VDPA_BASE_RX_QID 1
> +
> +static const char * const filter_names[] = { "bcast", "ucast", "mcast" };
> static struct virtio_device_id ef100_vdpa_id_table[] = {
> { .device = VIRTIO_ID_NET, .vendor = PCI_VENDOR_ID_REDHAT_QUMRANET },
> { 0 },
> };
>
> +static int ef100_vdpa_set_mac_filter(struct efx_nic *efx,
> + struct efx_filter_spec *spec,
> + u32 qid, u8 *mac_addr)
> +{
> + int rc;
> +
> + efx_filter_init_rx(spec, EFX_FILTER_PRI_AUTO, 0, qid);
> +
> + if (mac_addr) {
> + rc = efx_filter_set_eth_local(spec, EFX_FILTER_VID_UNSPEC,
> + mac_addr);
> + if (rc)
> + pci_err(efx->pci_dev,
> + "Filter set eth local failed, err: %d\n", rc);
> + } else {
> + efx_filter_set_mc_def(spec);
> + }
> +
> + rc = efx_filter_insert_filter(efx, spec, true);
> + if (rc < 0)
> + pci_err(efx->pci_dev,
> + "Filter insert failed, err: %d\n", rc);
> +
> + return rc;
> +}
> +
> +static int ef100_vdpa_delete_filter(struct ef100_vdpa_nic *vdpa_nic,
> + enum ef100_vdpa_mac_filter_type type)
> +{
> + struct vdpa_device *vdev = &vdpa_nic->vdpa_dev;
> + int rc;
> +
> + if (vdpa_nic->filters[type].filter_id == EFX_INVALID_FILTER_ID)
> + return rc;
> +
> + rc = efx_filter_remove_id_safe(vdpa_nic->efx,
> + EFX_FILTER_PRI_AUTO,
> + vdpa_nic->filters[type].filter_id);
> + if (rc) {
> + dev_err(&vdev->dev, "%s filter id: %d remove failed, err: %d\n",
> + filter_names[type], vdpa_nic->filters[type].filter_id,
> + rc);
> + } else {
> + vdpa_nic->filters[type].filter_id = EFX_INVALID_FILTER_ID;
> + vdpa_nic->filter_cnt--;
> + }
> + return rc;
> +}
> +
> +int ef100_vdpa_add_filter(struct ef100_vdpa_nic *vdpa_nic,
> + enum ef100_vdpa_mac_filter_type type)
> +{
> + struct vdpa_device *vdev = &vdpa_nic->vdpa_dev;
> + struct efx_nic *efx = vdpa_nic->efx;
> + /* Configure filter on base Rx queue only */
> + u32 qid = EF100_VDPA_BASE_RX_QID;
> + struct efx_filter_spec *spec;
> + u8 baddr[ETH_ALEN];
> + int rc;
> +
> + /* remove existing filter */
> + rc = ef100_vdpa_delete_filter(vdpa_nic, type);
> + if (rc < 0) {
> + dev_err(&vdev->dev, "%s MAC filter deletion failed, err: %d",
> + filter_names[type], rc);
> + return rc;
> + }
> +
> + /* Configure MAC Filter */
> + spec = &vdpa_nic->filters[type].spec;
> + if (type == EF100_VDPA_BCAST_MAC_FILTER) {
> + eth_broadcast_addr(baddr);
> + rc = ef100_vdpa_set_mac_filter(efx, spec, qid, baddr);
> + } else if (type == EF100_VDPA_UNKNOWN_MCAST_MAC_FILTER) {
> + rc = ef100_vdpa_set_mac_filter(efx, spec, qid, NULL);
> + } else {
> + /* Ensure we have a valid mac address */
> + if (!vdpa_nic->mac_configured ||
> + !is_valid_ether_addr(vdpa_nic->mac_address))
> + return -EINVAL;
> +
> + rc = ef100_vdpa_set_mac_filter(efx, spec, qid,
> + vdpa_nic->mac_address);
> + }
> +
> + if (rc >= 0) {
> + vdpa_nic->filters[type].filter_id = rc;
> + vdpa_nic->filter_cnt++;
> +
> + return 0;
> + }
> +
> + dev_err(&vdev->dev, "%s MAC filter insert failed, err: %d\n",
> + filter_names[type], rc);
> +
> + if (type != EF100_VDPA_UNKNOWN_MCAST_MAC_FILTER) {
> + ef100_vdpa_filter_remove(vdpa_nic);
> + return rc;
> + }
> +
> + return 0;
> +}
> +
> +int ef100_vdpa_filter_remove(struct ef100_vdpa_nic *vdpa_nic)
> +{
> + enum ef100_vdpa_mac_filter_type filter;
> + int err = 0;
> + int rc;
> +
> + for (filter = EF100_VDPA_BCAST_MAC_FILTER;
> + filter <= EF100_VDPA_UNKNOWN_MCAST_MAC_FILTER; filter++) {
> + rc = ef100_vdpa_delete_filter(vdpa_nic, filter);
> + if (rc < 0)
> + /* store status of last failed filter remove */
> + err = rc;
> + }
> + return err;
> +}
> +
> +int ef100_vdpa_filter_configure(struct ef100_vdpa_nic *vdpa_nic)
> +{
> + struct vdpa_device *vdev = &vdpa_nic->vdpa_dev;
> + enum ef100_vdpa_mac_filter_type filter;
> + int rc;
> +
> + /* remove existing filters, if any */
> + rc = ef100_vdpa_filter_remove(vdpa_nic);
> + if (rc < 0) {
> + dev_err(&vdev->dev,
> + "MAC filter deletion failed, err: %d", rc);
> + goto fail;
> + }
> +
> + for (filter = EF100_VDPA_BCAST_MAC_FILTER;
> + filter <= EF100_VDPA_UNKNOWN_MCAST_MAC_FILTER; filter++) {
> + if (filter == EF100_VDPA_UCAST_MAC_FILTER &&
> + !vdpa_nic->mac_configured)
> + continue;

Nit: is this better to move this inside ef100_vdpa_add_filter()?

> + rc = ef100_vdpa_add_filter(vdpa_nic, filter);
> + if (rc < 0)
> + goto fail;
> + }
> +fail:
> + return rc;
> +}
> +
> int ef100_vdpa_init(struct efx_probe_data *probe_data)
> {
> struct efx_nic *efx = &probe_data->efx;
> @@ -185,6 +339,9 @@ static struct ef100_vdpa_nic *ef100_vdpa_create(struct efx_nic *efx,
> goto err_put_device;
> }
>
> + for (i = 0; i < EF100_VDPA_MAC_FILTER_NTYPES; i++)
> + vdpa_nic->filters[i].filter_id = EFX_INVALID_FILTER_ID;
> +
> rc = get_net_config(vdpa_nic);
> if (rc)
> goto err_put_device;
> diff --git a/drivers/net/ethernet/sfc/ef100_vdpa.h b/drivers/net/ethernet/sfc/ef100_vdpa.h
> index 58791402e454..49fb6be04eb3 100644
> --- a/drivers/net/ethernet/sfc/ef100_vdpa.h
> +++ b/drivers/net/ethernet/sfc/ef100_vdpa.h
> @@ -72,6 +72,22 @@ enum ef100_vdpa_vq_type {
> EF100_VDPA_VQ_NTYPES
> };
>
> +/**
> + * enum ef100_vdpa_mac_filter_type - vdpa filter types
> + *
> + * @EF100_VDPA_BCAST_MAC_FILTER: Broadcast MAC filter
> + * @EF100_VDPA_UCAST_MAC_FILTER: Unicast MAC filter
> + * @EF100_VDPA_UNKNOWN_MCAST_MAC_FILTER: Unknown multicast MAC filter to allow
> + * IPv6 Neighbor Solicitation Message
> + * @EF100_VDPA_MAC_FILTER_NTYPES: Number of vDPA filter types
> + */
> +enum ef100_vdpa_mac_filter_type {
> + EF100_VDPA_BCAST_MAC_FILTER,
> + EF100_VDPA_UCAST_MAC_FILTER,
> + EF100_VDPA_UNKNOWN_MCAST_MAC_FILTER,
> + EF100_VDPA_MAC_FILTER_NTYPES,
> +};
> +
> /**
> * struct ef100_vdpa_vring_info - vDPA vring data structure
> *
> @@ -107,6 +123,17 @@ struct ef100_vdpa_vring_info {
> struct vdpa_callback cb;
> };
>
> +/**
> + * struct ef100_vdpa_filter - vDPA filter data structure
> + *
> + * @filter_id: filter id of this filter
> + * @efx_filter_spec: hardware filter specs for this vdpa device
> + */
> +struct ef100_vdpa_filter {
> + s32 filter_id;
> + struct efx_filter_spec spec;
> +};
> +
> /**
> * struct ef100_vdpa_nic - vDPA NIC data structure
> *
> @@ -116,6 +143,7 @@ struct ef100_vdpa_vring_info {
> * @lock: Managing access to vdpa config operations
> * @pf_index: PF index of the vDPA VF
> * @vf_index: VF index of the vDPA VF
> + * @filter_cnt: total number of filters created on this vdpa device
> * @status: device status as per VIRTIO spec
> * @features: negotiated feature bits
> * @max_queue_pairs: maximum number of queue pairs supported
> @@ -123,6 +151,7 @@ struct ef100_vdpa_vring_info {
> * @vring: vring information of the vDPA device.
> * @mac_address: mac address of interface associated with this vdpa device
> * @mac_configured: true after MAC address is configured
> + * @filters: details of all filters created on this vdpa device
> * @cfg_cb: callback for config change
> */
> struct ef100_vdpa_nic {
> @@ -133,6 +162,7 @@ struct ef100_vdpa_nic {
> struct mutex lock;
> u32 pf_index;
> u32 vf_index;
> + u32 filter_cnt;
> u8 status;
> u64 features;
> u32 max_queue_pairs;
> @@ -140,6 +170,7 @@ struct ef100_vdpa_nic {
> struct ef100_vdpa_vring_info vring[EF100_VDPA_MAX_QUEUES_PAIRS * 2];
> u8 *mac_address;
> bool mac_configured;
> + struct ef100_vdpa_filter filters[EF100_VDPA_MAC_FILTER_NTYPES];
> struct vdpa_callback cfg_cb;
> };
>
> @@ -147,7 +178,10 @@ int ef100_vdpa_init(struct efx_probe_data *probe_data);
> void ef100_vdpa_fini(struct efx_probe_data *probe_data);
> int ef100_vdpa_register_mgmtdev(struct efx_nic *efx);
> void ef100_vdpa_unregister_mgmtdev(struct efx_nic *efx);
> -void ef100_vdpa_irq_vectors_free(void *data);
> +int ef100_vdpa_filter_configure(struct ef100_vdpa_nic *vdpa_nic);
> +int ef100_vdpa_filter_remove(struct ef100_vdpa_nic *vdpa_nic);
> +int ef100_vdpa_add_filter(struct ef100_vdpa_nic *vdpa_nic,
> + enum ef100_vdpa_mac_filter_type type);
> int ef100_vdpa_init_vring(struct ef100_vdpa_nic *vdpa_nic, u16 idx);
> void ef100_vdpa_irq_vectors_free(void *data);
> int ef100_vdpa_reset(struct vdpa_device *vdev);
> diff --git a/drivers/net/ethernet/sfc/ef100_vdpa_ops.c b/drivers/net/ethernet/sfc/ef100_vdpa_ops.c
> index 95a2177f85a2..db86c2693950 100644
> --- a/drivers/net/ethernet/sfc/ef100_vdpa_ops.c
> +++ b/drivers/net/ethernet/sfc/ef100_vdpa_ops.c
> @@ -261,6 +261,7 @@ static void ef100_reset_vdpa_device(struct ef100_vdpa_nic *vdpa_nic)
> vdpa_nic->vdpa_state = EF100_VDPA_STATE_INITIALIZED;
> vdpa_nic->status = 0;
> vdpa_nic->features = 0;
> + ef100_vdpa_filter_remove(vdpa_nic);
> for (i = 0; i < (vdpa_nic->max_queue_pairs * 2); i++)
> reset_vring(vdpa_nic, i);
> ef100_vdpa_irq_vectors_free(vdpa_nic->efx->pci_dev);
> @@ -295,7 +296,7 @@ static int start_vdpa_device(struct ef100_vdpa_nic *vdpa_nic)
> rc = ef100_vdpa_irq_vectors_alloc(efx->pci_dev,
> vdpa_nic->max_queue_pairs * 2);
> if (rc < 0) {
> - pci_err(efx->pci_dev,
> + dev_err(&vdpa_nic->vdpa_dev.dev,

This should be done in the previous patch.

Thanks

> "vDPA IRQ alloc failed for vf: %u err:%d\n",
> nic_data->vf_index, rc);
> return rc;
> @@ -309,9 +310,19 @@ static int start_vdpa_device(struct ef100_vdpa_nic *vdpa_nic)
> }
> }
>
> + rc = ef100_vdpa_filter_configure(vdpa_nic);
> + if (rc < 0) {
> + dev_err(&vdpa_nic->vdpa_dev.dev,
> + "%s: vdpa configure filter failed, err: %d\n",
> + __func__, rc);
> + goto err_filter_configure;
> + }
> +
> vdpa_nic->vdpa_state = EF100_VDPA_STATE_STARTED;
> return 0;
>
> +err_filter_configure:
> + ef100_vdpa_filter_remove(vdpa_nic);
> clear_vring:
> for (j = 0; j < i; j++)
> delete_vring(vdpa_nic, j);
> @@ -680,8 +691,10 @@ static void ef100_vdpa_set_config(struct vdpa_device *vdev, unsigned int offset,
> }
>
> memcpy((u8 *)&vdpa_nic->net_config + offset, buf, len);
> - if (is_valid_ether_addr(vdpa_nic->mac_address))
> + if (is_valid_ether_addr(vdpa_nic->mac_address)) {
> vdpa_nic->mac_configured = true;
> + ef100_vdpa_add_filter(vdpa_nic, EF100_VDPA_UCAST_MAC_FILTER);
> + }
> }
>
> static int ef100_vdpa_suspend(struct vdpa_device *vdev)
> --
> 2.30.1
>

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