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[87.212.117.46]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b90e250f74csm103652666b.16.2026.02.24.08.33.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Feb 2026 08:33:52 -0800 (PST) From: Valerie Aurora To: rpdfs-devel@lists.linux.dev Cc: Valerie Aurora Subject: [PATCH 2/3] Workaround for short read from io_uring on aarch64 Date: Tue, 24 Feb 2026 17:33:25 +0100 Message-ID: <20260224163327.2441-3-val@versity.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20260224163327.2441-1-val@versity.com> References: <20260224163327.2441-1-val@versity.com> Precedence: bulk X-Mailing-List: rpdfs-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit For some reason, io_uring returns a short read even with MSG_WAITALL - but on aarch64 and not x86_64. Work around that with an outer loop --- utask/net.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/utask/net.c b/utask/net.c index 7f21e4c..35919fd 100644 --- a/utask/net.c +++ b/utask/net.c @@ -265,11 +265,19 @@ static ssize_t recv_waiter(int fd, void *buf, size_t size, int flags) { struct utask_cqe_waiter waiter; struct io_uring_sqe *sqe; + size_t len = 0; int ret; - sqe = utask_get_sqe_waiter(&waiter); - io_uring_prep_recv(sqe, fd, buf, size, flags | MSG_WAITALL); - ret = utask_wait_event_task(waiter.completed); + /* TODO: Figure out why io_uring returns a short read on aarch64 */ + while (len < size) { + sqe = utask_get_sqe_waiter(&waiter); + io_uring_prep_recv(sqe, fd, buf + len, size - len, flags | MSG_WAITALL); + ret = utask_wait_event_task(waiter.completed); + + if (waiter.res < 0) + break; + len += waiter.res; + } /* == 0 when fd is shutdown/disconnected */ BUG_ON(ret == 0 && waiter.res > 0 && waiter.res != size); -- 2.49.0