From: 'Christoph Hellwig' <hch@lst.de> To: David Laight <David.Laight@ACULAB.COM> Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>, Eric Dumazet <edumazet@google.com>, "linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>, "linux-sctp@vger.kernel.org" <linux-sctp@vger.kernel.org>, "target-devel@vger.kernel.org" <target-devel@vger.kernel.org>, "linux-afs@lists.infradead.org" <linux-afs@lists.infradead.org>, "drbd-dev@lists.linbit.com" <drbd-dev@lists.linbit.com>, "linux-cifs@vger.kernel.org" <linux-cifs@vger.kernel.org>, "rds-devel@oss.oracle.com" <rds-devel@oss.oracle.com>, "linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>, 'Christoph Hellwig' <hch@lst.de>, "cluster-devel@redhat.com" <cluster-devel@redhat.com>, Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>, Jakub Kicinski <kuba@kernel.org>, "ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>, "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>, Neil Horman <nhorman@tuxdriver.com>, Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>, "netdev@vger.kernel.org" <netdev@vger.kernel.org>, Vlad Yasevich <vyasevich@gmail.com>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, Jon Maloy <jmaloy@redhat.com>, Ying Xue <ying.xue@windriver.com>, "David S. Miller" <davem@davemloft.net>, "ocfs2-devel@oss.oracle.com" <ocfs2-devel@oss.oracle.com> Subject: Re: remove kernel_setsockopt and kernel_getsockopt v2 Date: Thu, 21 May 2020 11:11:50 +0200 Message-ID: <20200521091150.GA8401@lst.de> (raw) In-Reply-To: <138a17dfff244c089b95f129e4ea2f66@AcuMS.aculab.com> On Thu, May 21, 2020 at 08:01:33AM +0000, David Laight wrote: > How much does this increase the kernel code by? 44 files changed, 660 insertions(+), 843 deletions(-) > You are also replicating a lot of code making it more > difficult to maintain. No, I specifically don't. > I don't think the performance of an socket option code > really matters - it is usually done once when a socket > is initialised and the other costs of establishing a > connection will dominate. > > Pulling the user copies outside the [gs]etsocksopt switch > statement not only reduces the code size (source and object) > and trivially allows kernel_[sg]sockopt() to me added to > the list of socket calls. > > It probably isn't possible to pull the usercopies right > out into the syscall wrapper because of some broken > requests. Please read through the previous discussion of the rationale and the options. We've been there before. > I worried about whether getsockopt() should read the entire > user buffer first. SCTP needs the some of it often (including a > sockaddr_storage in one case), TCP needs it once. > However the cost of reading a few words is small, and a big > buffer probably needs setting to avoid leaking kernel > memory if the structure has holes or fields that don't get set. > Reading from userspace solves both issues. As mention in the thread on the last series: That was my first idea, but we have way to many sockopts, especially in obscure protocols that just hard code the size. The chance of breaking userspace in a way that can't be fixed without going back to passing user pointers to get/setsockopt is way to high to commit to such a change unfortunately. _______________________________________________ linux-nvme mailing list linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme
next prev parent reply index Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-05-20 19:54 Christoph Hellwig 2020-05-20 19:54 ` [PATCH 01/33] dlm: use the tcp version of accept_from_sock for sctp as well Christoph Hellwig 2020-05-20 19:54 ` [PATCH 02/33] net: remove kernel_getsockopt Christoph Hellwig 2020-05-20 19:54 ` [PATCH 03/33] net: add sock_set_reuseaddr Christoph Hellwig 2020-05-20 19:54 ` [PATCH 04/33] net: add sock_no_linger Christoph Hellwig 2020-05-20 19:54 ` [PATCH 05/33] net: add sock_set_priority Christoph Hellwig 2020-05-20 19:54 ` [PATCH 06/33] net: add sock_set_sndtimeo Christoph Hellwig 2020-05-20 19:54 ` [PATCH 07/33] net: add sock_bindtoindex Christoph Hellwig 2020-05-20 19:54 ` [PATCH 08/33] net: add sock_enable_timestamps Christoph Hellwig 2020-05-20 19:54 ` [PATCH 09/33] net: add sock_set_keepalive Christoph Hellwig 2020-05-20 19:54 ` [PATCH 10/33] net: add sock_set_rcvbuf Christoph Hellwig 2020-05-20 19:54 ` [PATCH 11/33] net: add sock_set_reuseport Christoph Hellwig 2020-05-20 19:54 ` [PATCH 12/33] tcp: add tcp_sock_set_cork Christoph Hellwig 2020-05-20 19:54 ` [PATCH 13/33] tcp: add tcp_sock_set_nodelay Christoph Hellwig 2020-05-20 19:54 ` [PATCH 14/33] tcp: add tcp_sock_set_quickack Christoph Hellwig 2020-05-20 19:54 ` [PATCH 15/33] tcp: add tcp_sock_set_syncnt Christoph Hellwig 2020-05-20 19:54 ` [PATCH 16/33] tcp: add tcp_sock_set_user_timeout Christoph Hellwig 2020-05-20 19:54 ` [PATCH 17/33] tcp: add tcp_sock_set_keepidle Christoph Hellwig 2020-05-20 19:54 ` [PATCH 18/33] tcp: add tcp_sock_set_keepintvl Christoph Hellwig 2020-05-20 19:54 ` [PATCH 19/33] tcp: add tcp_sock_set_keepcnt Christoph Hellwig 2020-05-20 19:54 ` [PATCH 20/33] ipv4: add ip_sock_set_tos Christoph Hellwig 2020-05-20 19:54 ` [PATCH 21/33] ipv4: add ip_sock_set_freebind Christoph Hellwig 2020-05-20 19:54 ` [PATCH 22/33] ipv4: add ip_sock_set_recverr Christoph Hellwig 2020-05-20 19:54 ` [PATCH 23/33] ipv4: add ip_sock_set_mtu_discover Christoph Hellwig 2020-05-20 19:55 ` [PATCH 24/33] ipv4: add ip_sock_set_pktinfo Christoph Hellwig 2020-05-20 19:55 ` [PATCH 25/33] ipv6: add ip6_sock_set_v6only Christoph Hellwig 2020-05-20 19:55 ` [PATCH 26/33] ipv6: add ip6_sock_set_recverr Christoph Hellwig 2020-05-20 19:55 ` [PATCH 27/33] ipv6: add ip6_sock_set_addr_preferences Christoph Hellwig 2020-05-20 19:55 ` [PATCH 28/33] ipv6: add ip6_sock_set_recvpktinfo Christoph Hellwig 2020-05-20 19:55 ` [PATCH 29/33] rxrpc: add rxrpc_sock_set_min_security_level Christoph Hellwig 2020-05-20 19:55 ` [PATCH 30/33] tipc: call tsk_set_importance from tipc_topsrv_create_listener Christoph Hellwig 2020-05-20 19:55 ` [PATCH 31/33] sctp: add sctp_sock_set_nodelay Christoph Hellwig 2020-05-20 23:10 ` Marcelo Ricardo Leitner 2020-05-20 23:23 ` David Miller 2020-05-20 23:39 ` Marcelo Ricardo Leitner 2020-05-21 8:34 ` Christoph Hellwig 2020-05-21 9:06 ` David Laight 2020-05-21 9:08 ` 'Christoph Hellwig' 2020-05-21 13:33 ` Marcelo Ricardo Leitner 2020-05-21 13:57 ` Christoph Hellwig 2020-05-20 19:55 ` [PATCH 32/33] net: add a new bind_add method Christoph Hellwig 2020-05-20 23:00 ` Marcelo Ricardo Leitner 2020-05-21 8:42 ` Christoph Hellwig 2020-05-21 13:54 ` Marcelo Ricardo Leitner 2020-05-20 19:55 ` [PATCH 33/33] net: remove kernel_setsockopt Christoph Hellwig 2020-05-21 7:44 ` [PATCH 29/33] rxrpc: add rxrpc_sock_set_min_security_level David Howells 2020-05-21 8:01 ` remove kernel_setsockopt and kernel_getsockopt v2 David Laight 2020-05-21 9:11 ` 'Christoph Hellwig' [this message] 2020-05-21 10:46 ` David Laight 2020-05-23 7:23 ` Christoph Hellwig
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