From: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
To: Shay Agroskin <shayagr@amazon.com>
Cc: Lorenzo Bianconi <lorenzo@kernel.org>,
bpf@vger.kernel.org, netdev@vger.kernel.org, davem@davemloft.net,
kuba@kernel.org, ast@kernel.org, daniel@iogearbox.net,
john.fastabend@gmail.com, dsahern@kernel.org, brouer@redhat.com,
echaudro@redhat.com, jasowang@redhat.com,
alexander.duyck@gmail.com, saeed@kernel.org,
maciej.fijalkowski@intel.com, magnus.karlsson@intel.com,
tirthendu.sarkar@intel.com, toke@redhat.com
Subject: Re: [PATCH v14 bpf-next 03/18] net: mvneta: update mb bit before passing the xdp buffer to eBPF layer
Date: Mon, 20 Sep 2021 10:37:20 +0200 [thread overview]
Message-ID: <YUhIQEIJxLRPpaRP@lore-desk> (raw)
In-Reply-To: <pj41zlh7ef8xgt.fsf@u570694869fb251.ant.amazon.com>
[-- Attachment #1: Type: text/plain, Size: 1827 bytes --]
>
> Lorenzo Bianconi <lorenzo@kernel.org> writes:
>
> > ...
> > diff --git a/drivers/net/ethernet/marvell/mvneta.c
> > b/drivers/net/ethernet/marvell/mvneta.c
> > index 9d460a270601..0c7b84ca6efc 100644
> > --- a/drivers/net/ethernet/marvell/mvneta.c
> > +++ b/drivers/net/ethernet/marvell/mvneta.c
> > ...
> > @@ -2320,8 +2325,12 @@ mvneta_swbm_build_skb(struct mvneta_port *pp,
> > struct page_pool *pool,
> > struct xdp_buff *xdp, u32 desc_status)
> > {
> > struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
> > - int i, num_frags = sinfo->nr_frags;
> > struct sk_buff *skb;
> > + u8 num_frags;
> > + int i;
> > +
> > + if (unlikely(xdp_buff_is_mb(xdp)))
> > + num_frags = sinfo->nr_frags;
>
> Hi,
> nit, it seems that the num_frags assignment can be moved after the other
> 'if' condition you added (right before the 'for' for num_frags), or even be
> eliminated completely so that sinfo->nr_frags is used directly.
> Either way it looks like you can remove one 'if'.
>
> Shay
Hi Shay,
we can't move nr_frags assignement after build_skb() since this field will be
overwritten by that call.
Regards,
Lorenzo
>
> > skb = build_skb(xdp->data_hard_start, PAGE_SIZE);
> > if (!skb)
> > @@ -2333,6 +2342,9 @@ mvneta_swbm_build_skb(struct mvneta_port *pp,
> > struct page_pool *pool,
> > skb_put(skb, xdp->data_end - xdp->data);
> > skb->ip_summed = mvneta_rx_csum(pp, desc_status);
> > + if (likely(!xdp_buff_is_mb(xdp)))
> > + goto out;
> > +
> > for (i = 0; i < num_frags; i++) {
> > skb_frag_t *frag = &sinfo->frags[i];
> > @@ -2341,6 +2353,7 @@ mvneta_swbm_build_skb(struct mvneta_port *pp,
> > struct page_pool *pool,
> > skb_frag_size(frag), PAGE_SIZE);
> > }
> > +out:
> > return skb;
> > }
>
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 228 bytes --]
next prev parent reply other threads:[~2021-09-20 8:38 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-10 16:14 [PATCH v14 bpf-next 00/18] mvneta: introduce XDP multi-buffer support Lorenzo Bianconi
2021-09-10 16:14 ` [PATCH v14 bpf-next 01/18] net: skbuff: add size metadata to skb_shared_info for xdp Lorenzo Bianconi
2021-09-10 16:18 ` Jesper Dangaard Brouer
2021-09-10 16:14 ` [PATCH v14 bpf-next 02/18] xdp: introduce flags field in xdp_buff/xdp_frame Lorenzo Bianconi
2021-09-10 16:19 ` Jesper Dangaard Brouer
2021-09-10 16:14 ` [PATCH v14 bpf-next 03/18] net: mvneta: update mb bit before passing the xdp buffer to eBPF layer Lorenzo Bianconi
2021-09-20 8:25 ` Shay Agroskin
2021-09-20 8:37 ` Lorenzo Bianconi [this message]
2021-09-20 8:45 ` Shay Agroskin
2021-09-20 9:00 ` Lorenzo Bianconi
2021-09-10 16:14 ` [PATCH v14 bpf-next 04/18] net: mvneta: simplify mvneta_swbm_add_rx_fragment management Lorenzo Bianconi
2021-09-10 16:14 ` [PATCH v14 bpf-next 05/18] net: xdp: add xdp_update_skb_shared_info utility routine Lorenzo Bianconi
2021-09-10 16:14 ` [PATCH v14 bpf-next 06/18] net: marvell: rely on " Lorenzo Bianconi
2021-09-10 16:14 ` [PATCH v14 bpf-next 07/18] xdp: add multi-buff support to xdp_return_{buff/frame} Lorenzo Bianconi
2021-09-10 16:14 ` [PATCH v14 bpf-next 08/18] net: mvneta: add multi buffer support to XDP_TX Lorenzo Bianconi
2021-09-10 16:14 ` [PATCH v14 bpf-next 09/18] net: mvneta: enable jumbo frames for XDP Lorenzo Bianconi
2021-09-10 16:14 ` [PATCH v14 bpf-next 10/18] bpf: add multi-buff support to the bpf_xdp_adjust_tail() API Lorenzo Bianconi
2021-09-16 16:55 ` Jakub Kicinski
2021-09-17 10:02 ` Lorenzo Bianconi
2021-09-17 13:03 ` Jakub Kicinski
2021-09-10 16:14 ` [PATCH v14 bpf-next 11/18] bpf: introduce bpf_xdp_get_buff_len helper Lorenzo Bianconi
2021-09-10 16:14 ` [PATCH v14 bpf-next 12/18] bpf: add multi-buffer support to xdp copy helpers Lorenzo Bianconi
2021-09-10 16:14 ` [PATCH v14 bpf-next 13/18] bpf: move user_size out of bpf_test_init Lorenzo Bianconi
2021-09-10 16:14 ` [PATCH v14 bpf-next 14/18] bpf: introduce multibuff support to bpf_prog_test_run_xdp() Lorenzo Bianconi
2021-09-10 16:14 ` [PATCH v14 bpf-next 15/18] bpf: test_run: add xdp_shared_info pointer in bpf_test_finish signature Lorenzo Bianconi
2021-09-10 16:14 ` [PATCH v14 bpf-next 16/18] bpf: update xdp_adjust_tail selftest to include multi-buffer Lorenzo Bianconi
2021-09-10 16:14 ` [PATCH v14 bpf-next 17/18] net: xdp: introduce bpf_xdp_adjust_data helper Lorenzo Bianconi
2021-09-10 16:14 ` [PATCH v14 bpf-next 18/18] bpf: add bpf_xdp_adjust_data selftest Lorenzo Bianconi
2021-09-16 16:55 ` [PATCH v14 bpf-next 00/18] mvneta: introduce XDP multi-buffer support Jakub Kicinski
2021-09-17 14:51 ` Lorenzo Bianconi
2021-09-17 18:33 ` Jakub Kicinski
2021-09-17 18:43 ` Alexei Starovoitov
2021-09-17 19:00 ` Jakub Kicinski
2021-09-17 19:10 ` Alexei Starovoitov
2021-09-17 22:07 ` John Fastabend
2021-09-18 11:53 ` Toke Høiland-Jørgensen
2021-09-20 18:02 ` Jakub Kicinski
2021-09-20 21:01 ` Toke Høiland-Jørgensen
2021-09-20 21:25 ` Jakub Kicinski
2021-09-20 22:44 ` Toke Høiland-Jørgensen
2021-09-21 10:03 ` Eelco Chaudron
2021-09-28 11:48 ` Magnus Karlsson
2021-09-29 10:36 ` Lorenz Bauer
2021-09-29 12:25 ` Toke Høiland-Jørgensen
2021-09-29 12:32 ` Lorenz Bauer
2021-09-29 17:48 ` Jakub Kicinski
2021-09-29 17:46 ` Jakub Kicinski
2021-09-29 10:41 ` Lorenz Bauer
2021-09-29 12:10 ` Toke Høiland-Jørgensen
2021-09-29 12:38 ` Lorenz Bauer
2021-09-29 18:54 ` Alexei Starovoitov
2021-09-29 19:22 ` Jakub Kicinski
2021-09-29 20:39 ` Toke Høiland-Jørgensen
2021-10-01 9:03 ` Lorenzo Bianconi
2021-10-01 18:35 ` Jakub Kicinski
2021-10-06 9:32 ` Lorenzo Bianconi
2021-10-06 10:08 ` Eelco Chaudron
2021-10-06 12:15 ` Lorenzo Bianconi
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=YUhIQEIJxLRPpaRP@lore-desk \
--to=lorenzo.bianconi@redhat.com \
--cc=alexander.duyck@gmail.com \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=brouer@redhat.com \
--cc=daniel@iogearbox.net \
--cc=davem@davemloft.net \
--cc=dsahern@kernel.org \
--cc=echaudro@redhat.com \
--cc=jasowang@redhat.com \
--cc=john.fastabend@gmail.com \
--cc=kuba@kernel.org \
--cc=lorenzo@kernel.org \
--cc=maciej.fijalkowski@intel.com \
--cc=magnus.karlsson@intel.com \
--cc=netdev@vger.kernel.org \
--cc=saeed@kernel.org \
--cc=shayagr@amazon.com \
--cc=tirthendu.sarkar@intel.com \
--cc=toke@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).