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Miller" , Eric Dumazet , Jesper Dangaard Brouer , David Ahern , Mina Almasry , Stanislav Fomichev , Joe Damato , Pedro Tammela Subject: [PATCH net-next v9 12/20] io_uring/zcrx: grab a net device Date: Tue, 17 Dec 2024 16:37:38 -0800 Message-ID: <20241218003748.796939-13-dw@davidwei.uk> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20241218003748.796939-1-dw@davidwei.uk> References: <20241218003748.796939-1-dw@davidwei.uk> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Pavel Begunkov Zerocopy receive needs a net device to bind to its rx queue and dma map buffers. As a preparation to following patches, resolve a net device from the if_idx parameter with no functional changes otherwise. Signed-off-by: Pavel Begunkov Signed-off-by: David Wei --- io_uring/zcrx.c | 10 ++++++++++ io_uring/zcrx.h | 3 +++ 2 files changed, 13 insertions(+) diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c index 04883a3ae80c..e6cca6747148 100644 --- a/io_uring/zcrx.c +++ b/io_uring/zcrx.c @@ -3,6 +3,8 @@ #include #include #include +#include +#include #include @@ -136,6 +138,8 @@ static void io_zcrx_ifq_free(struct io_zcrx_ifq *ifq) if (ifq->area) io_zcrx_free_area(ifq->area); + if (ifq->dev) + netdev_put(ifq->dev, &ifq->netdev_tracker); io_free_rbuf_ring(ifq); kfree(ifq); } @@ -195,6 +199,12 @@ int io_register_zcrx_ifq(struct io_ring_ctx *ctx, ifq->rq_entries = reg.rq_entries; ifq->if_rxq = reg.if_rxq; + ret = -ENODEV; + ifq->dev = netdev_get_by_index(current->nsproxy->net_ns, reg.if_idx, + &ifq->netdev_tracker, GFP_KERNEL); + if (!ifq->dev) + goto err; + reg.offsets.rqes = sizeof(struct io_uring); reg.offsets.head = offsetof(struct io_uring, head); reg.offsets.tail = offsetof(struct io_uring, tail); diff --git a/io_uring/zcrx.h b/io_uring/zcrx.h index 53fd94b65b38..46988a1dbd54 100644 --- a/io_uring/zcrx.h +++ b/io_uring/zcrx.h @@ -4,6 +4,7 @@ #include #include +#include struct io_zcrx_area { struct net_iov_area nia; @@ -27,6 +28,8 @@ struct io_zcrx_ifq { u32 rq_entries; u32 if_rxq; + struct net_device *dev; + netdevice_tracker netdev_tracker; }; #if defined(CONFIG_IO_URING_ZCRX)