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[73.93.5.123]) by smtp.gmail.com with ESMTPSA id b15sm20073923pgg.85.2021.03.02.09.20.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Mar 2021 09:20:35 -0800 (PST) From: Joe Stringer To: bpf@vger.kernel.org Cc: daniel@iogearbox.net, ast@kernel.org, linux-doc@vger.kernel.org, linux-man@vger.kernel.org, =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= , Quentin Monnet Subject: [PATCHv2 bpf-next 03/15] bpf: Document BPF_F_LOCK in syscall commands Date: Tue, 2 Mar 2021 09:19:35 -0800 Message-Id: <20210302171947.2268128-4-joe@cilium.io> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210302171947.2268128-1-joe@cilium.io> References: <20210302171947.2268128-1-joe@cilium.io> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Document the meaning of the BPF_F_LOCK flag for the map lookup/update descriptions. Based on commit 96049f3afd50 ("bpf: introduce BPF_F_LOCK flag"). Acked-by: Toke Høiland-Jørgensen Reviewed-by: Quentin Monnet Signed-off-by: Joe Stringer Acked-by: Yonghong Song --- CC: Alexei Starovoitov --- include/uapi/linux/bpf.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 052bbfe65f77..eb9f059f0569 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -123,6 +123,14 @@ union bpf_iter_link_info { * Look up an element with a given *key* in the map referred to * by the file descriptor *map_fd*. * + * The *flags* argument may be specified as one of the + * following: + * + * **BPF_F_LOCK** + * Look up the value of a spin-locked map without + * returning the lock. This must be specified if the + * elements contain a spinlock. + * * Return * Returns zero on success. On error, -1 is returned and *errno* * is set appropriately. @@ -140,6 +148,8 @@ union bpf_iter_link_info { * Create a new element only if it did not exist. * **BPF_EXIST** * Update an existing element. + * **BPF_F_LOCK** + * Update a spin_lock-ed map element. * * Return * Returns zero on success. On error, -1 is returned and *errno*