Re: [PATCH net-next v2] bnxt_en: Allow to set switchdev mode without existing VFs

Venkat Duvvuru
2023-04-11T17:48:25Z

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> Remove an inability of bnxt_en driver to set eswitch to switchdev
> mode without existing VFs by:
>
> 1. Allow to set switchdev mode in bnxt_dl_eswitch_mode_set() so
> representors are created only when num_vfs > 0 otherwise just
> set bp->eswitch_mode
> 2. Do not automatically change bp->eswitch_mode during
> bnxt_vf_reps_create() and bnxt_vf_reps_destroy() calls so
> the eswitch mode is managed only by an user by devlink.
> Just set temporarily bp->eswitch_mode to legacy to avoid
> re-opening of representors during destroy.
> 3. Create representors in bnxt_sriov_enable() if current eswitch
> mode is switchdev one
>
> Tested by this sequence:
> 1. Set PF interface up
> 2. Set PF's eswitch mode to switchdev
> 3. Created N VFs
> 4. Checked that N representors were created
> 5. Set eswitch mode to legacy
> 6. Checked that representors were deleted
> 7. Set eswitch mode back to switchdev
> 8. Checked that representors exist again for VFs
> 9. Deleted all VFs
> 10. Checked that all representors were deleted as well
> 11. Checked that current eswitch mode is still switchdev
>
> Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Acked-by: Venkat Duvvuru <venkatkumar.duvvuru@broadcom.com>
> ---
> .../net/ethernet/broadcom/bnxt/bnxt_sriov.c | 16 ++++++++++
> drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c | 29 ++++++++++++-------
> drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.h | 6 ++++
> 3 files changed, 41 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
> b/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
> index 3ed3a2b3b3a9..dde327f2c57e 100644
> --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
> +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
> @@ -825,8 +825,24 @@ static int bnxt_sriov_enable(struct bnxt *bp, int *num_vfs)
> if (rc)
> goto err_out2;
>
> + if (bp->eswitch_mode != DEVLINK_ESWITCH_MODE_SWITCHDEV)
> + return 0;
> +
> + /* Create representors for VFs in switchdev mode */
> + devl_lock(bp->dl);
> + rc = bnxt_vf_reps_create(bp);
> + devl_unlock(bp->dl);
> + if (rc) {
> + netdev_info(bp->dev, "Cannot enable VFS as
> representors cannot be created\n");
> + goto err_out3;
> + }
> +
> return 0;
>
> +err_out3:
> + /* Disable SR-IOV */
> + pci_disable_sriov(bp->pdev);
> +
> err_out2:
> /* Free the resources reserved for various VF's */
> bnxt_hwrm_func_vf_resource_free(bp, *num_vfs);
> diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c
> b/drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c
> index fcc65890820a..2f1a1f2d2157 100644
> --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c
> +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c
> @@ -356,10 +356,15 @@ void bnxt_vf_reps_destroy(struct bnxt *bp)
> /* un-publish cfa_code_map so that RX path can't see it anymore */
> kfree(bp->cfa_code_map);
> bp->cfa_code_map = NULL;
> - bp->eswitch_mode = DEVLINK_ESWITCH_MODE_LEGACY;
>
> - if (closed)
> + if (closed) {
> + /* Temporarily set legacy mode to avoid re-opening
> + * representors and restore switchdev mode after that.
> + */
> + bp->eswitch_mode = DEVLINK_ESWITCH_MODE_LEGACY;
> bnxt_open_nic(bp, false, false);
> + bp->eswitch_mode = DEVLINK_ESWITCH_MODE_SWITCHDEV;
> + }
> rtnl_unlock();
>
> /* Need to call vf_reps_destroy() outside of rntl_lock
> @@ -482,7 +487,7 @@ static void bnxt_vf_rep_netdev_init(struct bnxt
> *bp, struct bnxt_vf_rep *vf_rep,
> dev->min_mtu = ETH_ZLEN;
> }
>
> -static int bnxt_vf_reps_create(struct bnxt *bp)
> +int bnxt_vf_reps_create(struct bnxt *bp)
> {
> u16 *cfa_code_map = NULL, num_vfs = pci_num_vf(bp->pdev);
> struct bnxt_vf_rep *vf_rep;
> @@ -535,7 +540,6 @@ static int bnxt_vf_reps_create(struct bnxt *bp)
>
> /* publish cfa_code_map only after all VF-reps have been initialized */
> bp->cfa_code_map = cfa_code_map;
> - bp->eswitch_mode = DEVLINK_ESWITCH_MODE_SWITCHDEV;
> netif_keep_dst(bp->dev);
> return 0;
>
> @@ -559,6 +563,7 @@ int bnxt_dl_eswitch_mode_set(struct devlink
> *devlink, u16 mode,
> struct netlink_ext_ack *extack)
> {
> struct bnxt *bp = bnxt_get_bp_from_dl(devlink);
> + int ret = 0;
>
> if (bp->eswitch_mode == mode) {
> netdev_info(bp->dev, "already in %s eswitch mode\n",
> @@ -570,7 +575,7 @@ int bnxt_dl_eswitch_mode_set(struct devlink
> *devlink, u16 mode,
> switch (mode) {
> case DEVLINK_ESWITCH_MODE_LEGACY:
> bnxt_vf_reps_destroy(bp);
> - return 0;
> + break;
>
> case DEVLINK_ESWITCH_MODE_SWITCHDEV:
> if (bp->hwrm_spec_code < 0x10803) {
> @@ -578,15 +583,19 @@ int bnxt_dl_eswitch_mode_set(struct devlink
> *devlink, u16 mode,
> return -ENOTSUPP;
> }
>
> - if (pci_num_vf(bp->pdev) == 0) {
> - netdev_info(bp->dev, "Enable VFs before
> setting switchdev mode\n");
> - return -EPERM;
> - }
> - return bnxt_vf_reps_create(bp);
> + /* Create representors for existing VFs */
> + if (pci_num_vf(bp->pdev) > 0)
> + ret = bnxt_vf_reps_create(bp);
> + break;
>
> default:
> return -EINVAL;
> }
> +
> + if (!ret)
> + bp->eswitch_mode = mode;
> +
> + return ret;
> }
>
> #endif
> diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.h
> b/drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.h
> index 5637a84884d7..33a965631d0b 100644
> --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.h
> +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.h
> @@ -14,6 +14,7 @@
>
> #define MAX_CFA_CODE 65536
>
> +int bnxt_vf_reps_create(struct bnxt *bp);
> void bnxt_vf_reps_destroy(struct bnxt *bp);
> void bnxt_vf_reps_close(struct bnxt *bp);
> void bnxt_vf_reps_open(struct bnxt *bp);
> @@ -37,6 +38,11 @@ int bnxt_dl_eswitch_mode_set(struct devlink
> *devlink, u16 mode,
>
> #else
>
> +static inline int bnxt_vf_reps_create(struct bnxt *bp)
> +{
> + return 0;
> +}
> +
> static inline void bnxt_vf_reps_close(struct bnxt *bp)
> {
> }
> --
> 2.39.2

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