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Date: Tue, 18 Dec 2018 15:52:51 +0100
From: Björn Töpel <bjorn.topel@...il.com>
To: Jan Sokolowski <jan.sokolowski@...el.com>
Cc: intel-wired-lan <intel-wired-lan@...ts.osuosl.org>,
Netdev <netdev@...r.kernel.org>, William Tu <u9012063@...il.com>
Subject: Re: [Intel-wired-lan] [PATCH 2/2] i40e: Remove umem from VSI
Den tis 18 dec. 2018 kl 14:48 skrev Jan Sokolowski <jan.sokolowski@...el.com>:
>
> As current implementation of netdev already contains and provides
> umems for us, we no longer have the need to contain these
> structures in i40e_vsi.
>
> Refactor the code to operate on netdev-provided umems.
>
> Signed-off-by: Jan Sokolowski <jan.sokolowski@...el.com>
> ---
> drivers/net/ethernet/intel/i40e/i40e.h | 10 +-
> drivers/net/ethernet/intel/i40e/i40e_xsk.c | 110 ++++-----------------
> 2 files changed, 21 insertions(+), 99 deletions(-)
>
Nice cleanup! Also adding netdev and William (veth RFC) to Cc:.
Acked-by: Björn Töpel <bjorn.topel@...el.com>
> diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
> index 876cac317e79..c24163ac41da 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e.h
> +++ b/drivers/net/ethernet/intel/i40e/i40e.h
> @@ -34,6 +34,7 @@
> #include <net/pkt_cls.h>
> #include <net/tc_act/tc_gact.h>
> #include <net/tc_act/tc_mirred.h>
> +#include <net/xdp_sock.h>
> #include "i40e_type.h"
> #include "i40e_prototype.h"
> #include "i40e_client.h"
> @@ -786,11 +787,6 @@ struct i40e_vsi {
>
> /* VSI specific handlers */
> irqreturn_t (*irq_handler)(int irq, void *data);
> -
> - /* AF_XDP zero-copy */
> - struct xdp_umem **xsk_umems;
> - u16 num_xsk_umems_used;
> - u16 num_xsk_umems;
> } ____cacheline_internodealigned_in_smp;
>
> struct i40e_netdev_priv {
> @@ -1103,10 +1099,10 @@ static inline struct xdp_umem *i40e_xsk_umem(struct i40e_ring *ring)
> if (ring_is_xdp(ring))
> qid -= ring->vsi->alloc_queue_pairs;
>
> - if (!ring->vsi->xsk_umems || !ring->vsi->xsk_umems[qid] || !xdp_on)
> + if (!xdp_on)
> return NULL;
>
> - return ring->vsi->xsk_umems[qid];
> + return xdp_get_umem_from_qid(ring->vsi->netdev, qid);
> }
>
> int i40e_create_queue_channel(struct i40e_vsi *vsi, struct i40e_channel *ch);
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
> index 433c8e688c78..2980997e74b5 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
> @@ -9,69 +9,6 @@
> #include "i40e_txrx_common.h"
> #include "i40e_xsk.h"
>
> -/**
> - * i40e_alloc_xsk_umems - Allocate an array to store per ring UMEMs
> - * @vsi: Current VSI
> - *
> - * Returns 0 on success, <0 on failure
> - **/
> -static int i40e_alloc_xsk_umems(struct i40e_vsi *vsi)
> -{
> - if (vsi->xsk_umems)
> - return 0;
> -
> - vsi->num_xsk_umems_used = 0;
> - vsi->num_xsk_umems = vsi->alloc_queue_pairs;
> - vsi->xsk_umems = kcalloc(vsi->num_xsk_umems, sizeof(*vsi->xsk_umems),
> - GFP_KERNEL);
> - if (!vsi->xsk_umems) {
> - vsi->num_xsk_umems = 0;
> - return -ENOMEM;
> - }
> -
> - return 0;
> -}
> -
> -/**
> - * i40e_add_xsk_umem - Store a UMEM for a certain ring/qid
> - * @vsi: Current VSI
> - * @umem: UMEM to store
> - * @qid: Ring/qid to associate with the UMEM
> - *
> - * Returns 0 on success, <0 on failure
> - **/
> -static int i40e_add_xsk_umem(struct i40e_vsi *vsi, struct xdp_umem *umem,
> - u16 qid)
> -{
> - int err;
> -
> - err = i40e_alloc_xsk_umems(vsi);
> - if (err)
> - return err;
> -
> - vsi->xsk_umems[qid] = umem;
> - vsi->num_xsk_umems_used++;
> -
> - return 0;
> -}
> -
> -/**
> - * i40e_remove_xsk_umem - Remove a UMEM for a certain ring/qid
> - * @vsi: Current VSI
> - * @qid: Ring/qid associated with the UMEM
> - **/
> -static void i40e_remove_xsk_umem(struct i40e_vsi *vsi, u16 qid)
> -{
> - vsi->xsk_umems[qid] = NULL;
> - vsi->num_xsk_umems_used--;
> -
> - if (vsi->num_xsk_umems == 0) {
> - kfree(vsi->xsk_umems);
> - vsi->xsk_umems = NULL;
> - vsi->num_xsk_umems = 0;
> - }
> -}
> -
> /**
> * i40e_xsk_umem_dma_map - DMA maps all UMEM memory for the netdev
> * @vsi: Current VSI
> @@ -140,6 +77,7 @@ static void i40e_xsk_umem_dma_unmap(struct i40e_vsi *vsi, struct xdp_umem *umem)
> static int i40e_xsk_umem_enable(struct i40e_vsi *vsi, struct xdp_umem *umem,
> u16 qid)
> {
> + struct net_device *netdev = vsi->netdev;
> struct xdp_umem_fq_reuse *reuseq;
> bool if_running;
> int err;
> @@ -150,12 +88,9 @@ static int i40e_xsk_umem_enable(struct i40e_vsi *vsi, struct xdp_umem *umem,
> if (qid >= vsi->num_queue_pairs)
> return -EINVAL;
>
> - if (vsi->xsk_umems) {
> - if (qid >= vsi->num_xsk_umems)
> - return -EINVAL;
> - if (vsi->xsk_umems[qid])
> - return -EBUSY;
> - }
> + if (qid >= netdev->real_num_rx_queues ||
> + qid >= netdev->real_num_tx_queues)
> + return -EINVAL;
>
> reuseq = xsk_reuseq_prepare(vsi->rx_rings[0]->count);
> if (!reuseq)
> @@ -173,13 +108,7 @@ static int i40e_xsk_umem_enable(struct i40e_vsi *vsi, struct xdp_umem *umem,
> err = i40e_queue_pair_disable(vsi, qid);
> if (err)
> return err;
> - }
> -
> - err = i40e_add_xsk_umem(vsi, umem, qid);
> - if (err)
> - return err;
>
> - if (if_running) {
> err = i40e_queue_pair_enable(vsi, qid);
> if (err)
> return err;
> @@ -197,11 +126,13 @@ static int i40e_xsk_umem_enable(struct i40e_vsi *vsi, struct xdp_umem *umem,
> **/
> static int i40e_xsk_umem_disable(struct i40e_vsi *vsi, u16 qid)
> {
> + struct net_device *netdev = vsi->netdev;
> + struct xdp_umem *umem;
> bool if_running;
> int err;
>
> - if (!vsi->xsk_umems || qid >= vsi->num_xsk_umems ||
> - !vsi->xsk_umems[qid])
> + umem = xdp_get_umem_from_qid(netdev, qid);
> + if (!umem)
> return -EINVAL;
>
> if_running = netif_running(vsi->netdev) && i40e_enabled_xdp_vsi(vsi);
> @@ -212,8 +143,7 @@ static int i40e_xsk_umem_disable(struct i40e_vsi *vsi, u16 qid)
> return err;
> }
>
> - i40e_xsk_umem_dma_unmap(vsi, vsi->xsk_umems[qid]);
> - i40e_remove_xsk_umem(vsi, qid);
> + i40e_xsk_umem_dma_unmap(vsi, umem);
>
> if (if_running) {
> err = i40e_queue_pair_enable(vsi, qid);
> @@ -237,20 +167,18 @@ static int i40e_xsk_umem_disable(struct i40e_vsi *vsi, u16 qid)
> int i40e_xsk_umem_query(struct i40e_vsi *vsi, struct xdp_umem **umem,
> u16 qid)
> {
> + struct net_device *netdev = vsi->netdev;
> + struct xdp_umem *queried_umem;
> +
> if (vsi->type != I40E_VSI_MAIN)
> return -EINVAL;
>
> - if (qid >= vsi->num_queue_pairs)
> - return -EINVAL;
> + queried_umem = xdp_get_umem_from_qid(netdev, qid);
>
> - if (vsi->xsk_umems) {
> - if (qid >= vsi->num_xsk_umems)
> - return -EINVAL;
> - *umem = vsi->xsk_umems[qid];
> - return 0;
> - }
> + if (!queried_umem)
> + return -EINVAL;
>
> - *umem = NULL;
> + *umem = queried_umem;
> return 0;
> }
>
> @@ -953,13 +881,11 @@ void i40e_xsk_clean_tx_ring(struct i40e_ring *tx_ring)
> **/
> bool i40e_xsk_any_rx_ring_enabled(struct i40e_vsi *vsi)
> {
> + struct net_device *netdev = vsi->netdev;
> int i;
>
> - if (!vsi->xsk_umems)
> - return false;
> -
> for (i = 0; i < vsi->num_queue_pairs; i++) {
> - if (vsi->xsk_umems[i])
> + if (xdp_get_umem_from_qid(netdev, i))
> return true;
> }
>
> --
> 2.18.1
>
> _______________________________________________
> Intel-wired-lan mailing list
> Intel-wired-lan@...osl.org
> https://lists.osuosl.org/mailman/listinfo/intel-wired-lan
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