netdev - [PATCH bpf-next 0/2] load-acquire/store-release semantics for AF

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Message-Id: <20210301104318.263262-1-bjorn.topel@gmail.com>
Date:   Mon,  1 Mar 2021 11:43:16 +0100
From:   Björn Töpel <bjorn.topel@...il.com>
To:     ast@...nel.org, daniel@...earbox.net, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     Björn Töpel <bjorn.topel@...il.com>,
        bjorn.topel@...el.com, magnus.karlsson@...el.com,
        jonathan.lemon@...il.com, maximmi@...dia.com, andrii@...nel.org
Subject: [PATCH bpf-next 0/2] load-acquire/store-release semantics for AF_XDP rings

This two-patch series introduces load-acquire/store-release semantics
for the AF_XDP rings.

For most contemporary architectures, this is more effective than a
SPSC ring based on smp_{r,w,}mb() barriers. More importantly,
load-acquire/store-release semantics make the ring code easier to
follow.

This is effectively the change done in commit 6c43c091bdc5
("documentation: Update circular buffer for
load-acquire/store-release"), but for the AF_XDP rings.

Both libbpf and the kernel-side are updated.

More details in each commit.

Thanks,
Björn

Björn Töpel (2):
  xsk: update rings for load-acquire/store-release semantics
  libbpf, xsk: add libbpf_smp_store_release libbpf_smp_load_acquire

 net/xdp/xsk_queue.h         | 27 ++++++--------
 tools/lib/bpf/libbpf_util.h | 72 +++++++++++++++++++++++++------------
 tools/lib/bpf/xsk.h         | 17 +++------
 3 files changed, 66 insertions(+), 50 deletions(-)

base-commit: 85e142cb42a1e7b33971bf035dae432d8670c46b
-- 
2.27.0