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Message-ID: <CAKH8qBsUOdRax0m5XM8guudSX_VYpJuMz_mzdMJegDsq4_ezwA@mail.gmail.com>
Date: Thu, 12 Jan 2023 11:10:24 -0800
From: Stanislav Fomichev <sdf@...gle.com>
To: Tariq Toukan <ttoukan.linux@...il.com>
Cc: bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org,
yhs@...com, john.fastabend@...il.com, kpsingh@...nel.org,
haoluo@...gle.com, jolsa@...nel.org,
Toke Høiland-Jørgensen <toke@...hat.com>,
Tariq Toukan <tariqt@...dia.com>,
Saeed Mahameed <saeedm@...dia.com>,
David Ahern <dsahern@...il.com>,
Jakub Kicinski <kuba@...nel.org>,
Willem de Bruijn <willemb@...gle.com>,
Jesper Dangaard Brouer <brouer@...hat.com>,
Anatoly Burakov <anatoly.burakov@...el.com>,
Alexander Lobakin <alexandr.lobakin@...el.com>,
Magnus Karlsson <magnus.karlsson@...il.com>,
Maryam Tahhan <mtahhan@...hat.com>, xdp-hints@...-project.net,
netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next v7 15/17] net/mlx5e: Introduce wrapper for xdp_buff
On Thu, Jan 12, 2023 at 12:07 AM Tariq Toukan <ttoukan.linux@...il.com> wrote:
>
>
>
> On 12/01/2023 2:32, Stanislav Fomichev wrote:
> > From: Toke Høiland-Jørgensen <toke@...hat.com>
> >
> > Preparation for implementing HW metadata kfuncs. No functional change.
> >
> > Cc: Tariq Toukan <tariqt@...dia.com>
> > Cc: Saeed Mahameed <saeedm@...dia.com>
> > Cc: John Fastabend <john.fastabend@...il.com>
> > Cc: David Ahern <dsahern@...il.com>
> > Cc: Martin KaFai Lau <martin.lau@...ux.dev>
> > Cc: Jakub Kicinski <kuba@...nel.org>
> > Cc: Willem de Bruijn <willemb@...gle.com>
> > Cc: Jesper Dangaard Brouer <brouer@...hat.com>
> > Cc: Anatoly Burakov <anatoly.burakov@...el.com>
> > Cc: Alexander Lobakin <alexandr.lobakin@...el.com>
> > Cc: Magnus Karlsson <magnus.karlsson@...il.com>
> > Cc: Maryam Tahhan <mtahhan@...hat.com>
> > Cc: xdp-hints@...-project.net
> > Cc: netdev@...r.kernel.org
> > Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
> > Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
> > ---
> > drivers/net/ethernet/mellanox/mlx5/core/en.h | 1 +
> > .../net/ethernet/mellanox/mlx5/core/en/xdp.c | 3 +-
> > .../net/ethernet/mellanox/mlx5/core/en/xdp.h | 6 +-
> > .../ethernet/mellanox/mlx5/core/en/xsk/rx.c | 25 ++++----
> > .../net/ethernet/mellanox/mlx5/core/en_rx.c | 58 +++++++++----------
> > 5 files changed, 50 insertions(+), 43 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
> > index 2d77fb8a8a01..af663978d1b4 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
> > @@ -469,6 +469,7 @@ struct mlx5e_txqsq {
> > union mlx5e_alloc_unit {
> > struct page *page;
> > struct xdp_buff *xsk;
> > + struct mlx5e_xdp_buff *mxbuf;
>
> In XSK files below you mix usage of both alloc_units[page_idx].mxbuf and
> alloc_units[page_idx].xsk, while both fields share the memory of a union.
>
> As struct mlx5e_xdp_buff wraps struct xdp_buff, I think that you just
> need to change the existing xsk field type from struct xdp_buff *xsk
> into struct mlx5e_xdp_buff *xsk and align the usage.
Hmmm, good point. I'm actually not sure how it works currently.
mlx5e_alloc_unit.mxbuf doesn't seem to be initialized anywhere? Toke,
am I missing something?
I'm thinking about something like this:
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h
b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index af663978d1b4..2d77fb8a8a01 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -469,7 +469,6 @@ struct mlx5e_txqsq {
union mlx5e_alloc_unit {
struct page *page;
struct xdp_buff *xsk;
- struct mlx5e_xdp_buff *mxbuf;
};
/* XDP packets can be transmitted in different ways. On completion, we need to
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c
b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c
index 9cff82d764e3..fd0805df34b7 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c
@@ -234,7 +234,8 @@ struct sk_buff
*mlx5e_xsk_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq,
u32 head_offset,
u32 page_idx)
{
- struct mlx5e_xdp_buff *mxbuf = wi->alloc_units[page_idx].mxbuf;
+ struct mlx5e_xdp_buff *mxbuf =
container_of(wi->alloc_units[page_idx].xsk,
+ struct mlx5e_xdp_buff, xdp);
struct bpf_prog *prog;
/* Check packet size. Note LRO doesn't use linear SKB */
@@ -286,7 +287,8 @@ struct sk_buff
*mlx5e_xsk_skb_from_cqe_linear(struct mlx5e_rq *rq,
struct mlx5e_wqe_frag_info *wi,
u32 cqe_bcnt)
{
- struct mlx5e_xdp_buff *mxbuf = wi->au->mxbuf;
+ struct mlx5e_xdp_buff *mxbuf = container_of(wi->au->xsk,
+ struct mlx5e_xdp_buff, xdp);
struct bpf_prog *prog;
/* wi->offset is not used in this function, because xdp->data and the
Does it look sensible?
> > };
> >
> > /* XDP packets can be transmitted in different ways. On completion, we need to
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
> > index 20507ef2f956..31bb6806bf5d 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
> > @@ -158,8 +158,9 @@ mlx5e_xmit_xdp_buff(struct mlx5e_xdpsq *sq, struct mlx5e_rq *rq,
> >
> > /* returns true if packet was consumed by xdp */
> > bool mlx5e_xdp_handle(struct mlx5e_rq *rq, struct page *page,
> > - struct bpf_prog *prog, struct xdp_buff *xdp)
> > + struct bpf_prog *prog, struct mlx5e_xdp_buff *mxbuf)
> > {
> > + struct xdp_buff *xdp = &mxbuf->xdp;
> > u32 act;
> > int err;
> >
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h
> > index bc2d9034af5b..389818bf6833 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h
> > @@ -44,10 +44,14 @@
> > (MLX5E_XDP_INLINE_WQE_MAX_DS_CNT * MLX5_SEND_WQE_DS - \
> > sizeof(struct mlx5_wqe_inline_seg))
> >
> > +struct mlx5e_xdp_buff {
> > + struct xdp_buff xdp;
> > +};
> > +
> > struct mlx5e_xsk_param;
> > int mlx5e_xdp_max_mtu(struct mlx5e_params *params, struct mlx5e_xsk_param *xsk);
> > bool mlx5e_xdp_handle(struct mlx5e_rq *rq, struct page *page,
> > - struct bpf_prog *prog, struct xdp_buff *xdp);
> > + struct bpf_prog *prog, struct mlx5e_xdp_buff *mlctx);
> > void mlx5e_xdp_mpwqe_complete(struct mlx5e_xdpsq *sq);
> > bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq);
> > void mlx5e_free_xdpsq_descs(struct mlx5e_xdpsq *sq);
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c
> > index c91b54d9ff27..9cff82d764e3 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c
> > @@ -22,6 +22,7 @@ int mlx5e_xsk_alloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix)
> > goto err;
> >
> > BUILD_BUG_ON(sizeof(wi->alloc_units[0]) != sizeof(wi->alloc_units[0].xsk));
> > + XSK_CHECK_PRIV_TYPE(struct mlx5e_xdp_buff);
> > batch = xsk_buff_alloc_batch(rq->xsk_pool, (struct xdp_buff **)wi->alloc_units,
> > rq->mpwqe.pages_per_wqe);
> >
> > @@ -233,7 +234,7 @@ struct sk_buff *mlx5e_xsk_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq,
> > u32 head_offset,
> > u32 page_idx)
> > {
> > - struct xdp_buff *xdp = wi->alloc_units[page_idx].xsk;
> > + struct mlx5e_xdp_buff *mxbuf = wi->alloc_units[page_idx].mxbuf;
> > struct bpf_prog *prog;
> >
> > /* Check packet size. Note LRO doesn't use linear SKB */
> > @@ -249,9 +250,9 @@ struct sk_buff *mlx5e_xsk_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq,
> > */
> > WARN_ON_ONCE(head_offset);
> >
> > - xsk_buff_set_size(xdp, cqe_bcnt);
> > - xsk_buff_dma_sync_for_cpu(xdp, rq->xsk_pool);
> > - net_prefetch(xdp->data);
> > + xsk_buff_set_size(&mxbuf->xdp, cqe_bcnt);
> > + xsk_buff_dma_sync_for_cpu(&mxbuf->xdp, rq->xsk_pool);
> > + net_prefetch(mxbuf->xdp.data);
> >
> > /* Possible flows:
> > * - XDP_REDIRECT to XSKMAP:
> > @@ -269,7 +270,7 @@ struct sk_buff *mlx5e_xsk_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq,
> > */
> >
> > prog = rcu_dereference(rq->xdp_prog);
> > - if (likely(prog && mlx5e_xdp_handle(rq, NULL, prog, xdp))) {
> > + if (likely(prog && mlx5e_xdp_handle(rq, NULL, prog, mxbuf))) {
> > if (likely(__test_and_clear_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags)))
> > __set_bit(page_idx, wi->xdp_xmit_bitmap); /* non-atomic */
> > return NULL; /* page/packet was consumed by XDP */
> > @@ -278,14 +279,14 @@ struct sk_buff *mlx5e_xsk_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq,
> > /* XDP_PASS: copy the data from the UMEM to a new SKB and reuse the
> > * frame. On SKB allocation failure, NULL is returned.
> > */
> > - return mlx5e_xsk_construct_skb(rq, xdp);
> > + return mlx5e_xsk_construct_skb(rq, &mxbuf->xdp);
> > }
> >
> > struct sk_buff *mlx5e_xsk_skb_from_cqe_linear(struct mlx5e_rq *rq,
> > struct mlx5e_wqe_frag_info *wi,
> > u32 cqe_bcnt)
> > {
> > - struct xdp_buff *xdp = wi->au->xsk;
> > + struct mlx5e_xdp_buff *mxbuf = wi->au->mxbuf;
> > struct bpf_prog *prog;
> >
> > /* wi->offset is not used in this function, because xdp->data and the
> > @@ -295,17 +296,17 @@ struct sk_buff *mlx5e_xsk_skb_from_cqe_linear(struct mlx5e_rq *rq,
> > */
> > WARN_ON_ONCE(wi->offset);
> >
> > - xsk_buff_set_size(xdp, cqe_bcnt);
> > - xsk_buff_dma_sync_for_cpu(xdp, rq->xsk_pool);
> > - net_prefetch(xdp->data);
> > + xsk_buff_set_size(&mxbuf->xdp, cqe_bcnt);
> > + xsk_buff_dma_sync_for_cpu(&mxbuf->xdp, rq->xsk_pool);
> > + net_prefetch(mxbuf->xdp.data);
> >
> > prog = rcu_dereference(rq->xdp_prog);
> > - if (likely(prog && mlx5e_xdp_handle(rq, NULL, prog, xdp)))
> > + if (likely(prog && mlx5e_xdp_handle(rq, NULL, prog, mxbuf)))
> > return NULL; /* page/packet was consumed by XDP */
> >
> > /* XDP_PASS: copy the data from the UMEM to a new SKB. The frame reuse
> > * will be handled by mlx5e_free_rx_wqe.
> > * On SKB allocation failure, NULL is returned.
> > */
> > - return mlx5e_xsk_construct_skb(rq, xdp);
> > + return mlx5e_xsk_construct_skb(rq, &mxbuf->xdp);
> > }
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
> > index c8820ab22169..6affdddf5bcf 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
> > @@ -1575,11 +1575,11 @@ struct sk_buff *mlx5e_build_linear_skb(struct mlx5e_rq *rq, void *va,
> > return skb;
> > }
> >
> > -static void mlx5e_fill_xdp_buff(struct mlx5e_rq *rq, void *va, u16 headroom,
> > - u32 len, struct xdp_buff *xdp)
> > +static void mlx5e_fill_mxbuf(struct mlx5e_rq *rq, void *va, u16 headroom,
> > + u32 len, struct mlx5e_xdp_buff *mxbuf)
> > {
> > - xdp_init_buff(xdp, rq->buff.frame0_sz, &rq->xdp_rxq);
> > - xdp_prepare_buff(xdp, va, headroom, len, true);
> > + xdp_init_buff(&mxbuf->xdp, rq->buff.frame0_sz, &rq->xdp_rxq);
> > + xdp_prepare_buff(&mxbuf->xdp, va, headroom, len, true);
> > }
> >
> > static struct sk_buff *
> > @@ -1606,16 +1606,16 @@ mlx5e_skb_from_cqe_linear(struct mlx5e_rq *rq, struct mlx5e_wqe_frag_info *wi,
> >
> > prog = rcu_dereference(rq->xdp_prog);
> > if (prog) {
> > - struct xdp_buff xdp;
> > + struct mlx5e_xdp_buff mxbuf;
> >
> > net_prefetchw(va); /* xdp_frame data area */
> > - mlx5e_fill_xdp_buff(rq, va, rx_headroom, cqe_bcnt, &xdp);
> > - if (mlx5e_xdp_handle(rq, au->page, prog, &xdp))
> > + mlx5e_fill_mxbuf(rq, cqe, va, rx_headroom, cqe_bcnt, &mxbuf);
> > + if (mlx5e_xdp_handle(rq, au->page, prog, &mxbuf))
> > return NULL; /* page/packet was consumed by XDP */
> >
> > - rx_headroom = xdp.data - xdp.data_hard_start;
> > - metasize = xdp.data - xdp.data_meta;
> > - cqe_bcnt = xdp.data_end - xdp.data;
> > + rx_headroom = mxbuf.xdp.data - mxbuf.xdp.data_hard_start;
> > + metasize = mxbuf.xdp.data - mxbuf.xdp.data_meta;
> > + cqe_bcnt = mxbuf.xdp.data_end - mxbuf.xdp.data;
> > }
> > frag_size = MLX5_SKB_FRAG_SZ(rx_headroom + cqe_bcnt);
> > skb = mlx5e_build_linear_skb(rq, va, frag_size, rx_headroom, cqe_bcnt, metasize);
> > @@ -1637,9 +1637,9 @@ mlx5e_skb_from_cqe_nonlinear(struct mlx5e_rq *rq, struct mlx5e_wqe_frag_info *wi
> > union mlx5e_alloc_unit *au = wi->au;
> > u16 rx_headroom = rq->buff.headroom;
> > struct skb_shared_info *sinfo;
> > + struct mlx5e_xdp_buff mxbuf;
> > u32 frag_consumed_bytes;
> > struct bpf_prog *prog;
> > - struct xdp_buff xdp;
> > struct sk_buff *skb;
> > dma_addr_t addr;
> > u32 truesize;
> > @@ -1654,8 +1654,8 @@ mlx5e_skb_from_cqe_nonlinear(struct mlx5e_rq *rq, struct mlx5e_wqe_frag_info *wi
> > net_prefetchw(va); /* xdp_frame data area */
> > net_prefetch(va + rx_headroom);
> >
> > - mlx5e_fill_xdp_buff(rq, va, rx_headroom, frag_consumed_bytes, &xdp);
> > - sinfo = xdp_get_shared_info_from_buff(&xdp);
> > + mlx5e_fill_mxbuf(rq, va, rx_headroom, frag_consumed_bytes, &mxbuf);
> > + sinfo = xdp_get_shared_info_from_buff(&mxbuf.xdp);
> > truesize = 0;
> >
> > cqe_bcnt -= frag_consumed_bytes;
> > @@ -1673,13 +1673,13 @@ mlx5e_skb_from_cqe_nonlinear(struct mlx5e_rq *rq, struct mlx5e_wqe_frag_info *wi
> > dma_sync_single_for_cpu(rq->pdev, addr + wi->offset,
> > frag_consumed_bytes, rq->buff.map_dir);
> >
> > - if (!xdp_buff_has_frags(&xdp)) {
> > + if (!xdp_buff_has_frags(&mxbuf.xdp)) {
> > /* Init on the first fragment to avoid cold cache access
> > * when possible.
> > */
> > sinfo->nr_frags = 0;
> > sinfo->xdp_frags_size = 0;
> > - xdp_buff_set_frags_flag(&xdp);
> > + xdp_buff_set_frags_flag(&mxbuf.xdp);
> > }
> >
> > frag = &sinfo->frags[sinfo->nr_frags++];
> > @@ -1688,7 +1688,7 @@ mlx5e_skb_from_cqe_nonlinear(struct mlx5e_rq *rq, struct mlx5e_wqe_frag_info *wi
> > skb_frag_size_set(frag, frag_consumed_bytes);
> >
> > if (page_is_pfmemalloc(au->page))
> > - xdp_buff_set_frag_pfmemalloc(&xdp);
> > + xdp_buff_set_frag_pfmemalloc(&mxbuf.xdp);
> >
> > sinfo->xdp_frags_size += frag_consumed_bytes;
> > truesize += frag_info->frag_stride;
> > @@ -1701,7 +1701,7 @@ mlx5e_skb_from_cqe_nonlinear(struct mlx5e_rq *rq, struct mlx5e_wqe_frag_info *wi
> > au = head_wi->au;
> >
> > prog = rcu_dereference(rq->xdp_prog);
> > - if (prog && mlx5e_xdp_handle(rq, au->page, prog, &xdp)) {
> > + if (prog && mlx5e_xdp_handle(rq, au->page, prog, &mxbuf)) {
> > if (test_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags)) {
> > int i;
> >
> > @@ -1711,22 +1711,22 @@ mlx5e_skb_from_cqe_nonlinear(struct mlx5e_rq *rq, struct mlx5e_wqe_frag_info *wi
> > return NULL; /* page/packet was consumed by XDP */
> > }
> >
> > - skb = mlx5e_build_linear_skb(rq, xdp.data_hard_start, rq->buff.frame0_sz,
> > - xdp.data - xdp.data_hard_start,
> > - xdp.data_end - xdp.data,
> > - xdp.data - xdp.data_meta);
> > + skb = mlx5e_build_linear_skb(rq, mxbuf.xdp.data_hard_start, rq->buff.frame0_sz,
> > + mxbuf.xdp.data - mxbuf.xdp.data_hard_start,
> > + mxbuf.xdp.data_end - mxbuf.xdp.data,
> > + mxbuf.xdp.data - mxbuf.xdp.data_meta);
> > if (unlikely(!skb))
> > return NULL;
> >
> > page_ref_inc(au->page);
> >
> > - if (unlikely(xdp_buff_has_frags(&xdp))) {
> > + if (unlikely(xdp_buff_has_frags(&mxbuf.xdp))) {
> > int i;
> >
> > /* sinfo->nr_frags is reset by build_skb, calculate again. */
> > xdp_update_skb_shared_info(skb, wi - head_wi - 1,
> > sinfo->xdp_frags_size, truesize,
> > - xdp_buff_is_frag_pfmemalloc(&xdp));
> > + xdp_buff_is_frag_pfmemalloc(&mxbuf.xdp));
> >
> > for (i = 0; i < sinfo->nr_frags; i++) {
> > skb_frag_t *frag = &sinfo->frags[i];
> > @@ -2007,19 +2007,19 @@ mlx5e_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq, struct mlx5e_mpw_info *wi,
> >
> > prog = rcu_dereference(rq->xdp_prog);
> > if (prog) {
> > - struct xdp_buff xdp;
> > + struct mlx5e_xdp_buff mxbuf;
> >
> > net_prefetchw(va); /* xdp_frame data area */
> > - mlx5e_fill_xdp_buff(rq, va, rx_headroom, cqe_bcnt, &xdp);
> > - if (mlx5e_xdp_handle(rq, au->page, prog, &xdp)) {
> > + mlx5e_fill_mxbuf(rq, va, rx_headroom, cqe_bcnt, &mxbuf);
> > + if (mlx5e_xdp_handle(rq, au->page, prog, &mxbuf)) {
> > if (__test_and_clear_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags))
> > __set_bit(page_idx, wi->xdp_xmit_bitmap); /* non-atomic */
> > return NULL; /* page/packet was consumed by XDP */
> > }
> >
> > - rx_headroom = xdp.data - xdp.data_hard_start;
> > - metasize = xdp.data - xdp.data_meta;
> > - cqe_bcnt = xdp.data_end - xdp.data;
> > + rx_headroom = mxbuf.xdp.data - mxbuf.xdp.data_hard_start;
> > + metasize = mxbuf.xdp.data - mxbuf.xdp.data_meta;
> > + cqe_bcnt = mxbuf.xdp.data_end - mxbuf.xdp.data;
> > }
> > frag_size = MLX5_SKB_FRAG_SZ(rx_headroom + cqe_bcnt);
> > skb = mlx5e_build_linear_skb(rq, va, frag_size, rx_headroom, cqe_bcnt, metasize);
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