From patchwork Mon Jan 14 00:02:39 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Samuel Thibault X-Patchwork-Id: 10761485 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2F0D16C2 for ; Mon, 14 Jan 2019 00:20:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1E8E228989 for ; Mon, 14 Jan 2019 00:20:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 123D828992; Mon, 14 Jan 2019 00:20:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id A784E28989 for ; Mon, 14 Jan 2019 00:20:50 +0000 (UTC) Received: from localhost ([127.0.0.1]:41418 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gipzl-0006ly-Qr for patchwork-qemu-devel@patchwork.kernel.org; Sun, 13 Jan 2019 19:20:49 -0500 Received: from eggs.gnu.org ([209.51.188.92]:51233) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gipk6-0002yV-VZ for qemu-devel@nongnu.org; Sun, 13 Jan 2019 19:04:41 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gipk4-0006PR-37 for qemu-devel@nongnu.org; Sun, 13 Jan 2019 19:04:38 -0500 Received: from hera.aquilenet.fr ([2a0c:e300::1]:57278) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gipk3-0006LL-GZ for qemu-devel@nongnu.org; Sun, 13 Jan 2019 19:04:35 -0500 Received: from localhost (localhost [127.0.0.1]) by hera.aquilenet.fr (Postfix) with ESMTP id 1B4E31B9B; Mon, 14 Jan 2019 01:04:22 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at aquilenet.fr Received: from hera.aquilenet.fr ([127.0.0.1]) by localhost (hera.aquilenet.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Tf5ywttFFcIe; Mon, 14 Jan 2019 01:04:21 +0100 (CET) Received: from function.home (lfbn-1-11161-124.w86-213.abo.wanadoo.fr [86.213.235.124]) by hera.aquilenet.fr (Postfix) with ESMTPSA id 46C141B9F; Mon, 14 Jan 2019 01:04:08 +0100 (CET) Received: from samy by function.home with local (Exim 4.92-RC4) (envelope-from ) id 1gipjZ-0007nj-AQ; Mon, 14 Jan 2019 01:04:05 +0100 From: Samuel Thibault To: qemu-devel@nongnu.org Date: Mon, 14 Jan 2019 01:02:39 +0100 Message-Id: <20190114000326.29847-19-samuel.thibault@ens-lyon.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190114000326.29847-1-samuel.thibault@ens-lyon.org> References: <20190114000326.29847-1-samuel.thibault@ens-lyon.org> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2a0c:e300::1 Subject: [Qemu-devel] [PULL 18/65] slirp: remove the disabled readv()/writev() code path X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Samuel Thibault , stefanha@redhat.com, jan.kiszka@siemens.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Marc-André Lureau The soread() function may be used on datagram sockets, and would provide different behaviour if HAVE_READV was set, on empty datagrams. This looks like a minor optimization, that never has been a strong goal for slirp. Signed-off-by: Marc-André Lureau Reviewed-by: Daniel P. Berrangé Signed-off-by: Samuel Thibault --- slirp/slirp_config.h | 3 --- slirp/socket.c | 15 --------------- 2 files changed, 18 deletions(-) diff --git a/slirp/slirp_config.h b/slirp/slirp_config.h index f0cc1c781b..3ce64e088e 100644 --- a/slirp/slirp_config.h +++ b/slirp/slirp_config.h @@ -29,9 +29,6 @@ /* Define if the machine is big endian */ //#undef HOST_WORDS_BIGENDIAN -/* Define if you have readv */ -#undef HAVE_READV - /* Define if iovec needs to be declared */ #undef DECLARE_IOVEC #ifdef _WIN32 diff --git a/slirp/socket.c b/slirp/socket.c index 041ec5061a..7012c7c07d 100644 --- a/slirp/socket.c +++ b/slirp/socket.c @@ -187,12 +187,7 @@ soread(struct socket *so) */ sopreprbuf(so, iov, &n); -#ifdef HAVE_READV - nn = readv(so->s, (struct iovec *)iov, n); - DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn)); -#else nn = qemu_recv(so->s, iov[0].iov_base, iov[0].iov_len,0); -#endif if (nn <= 0) { if (nn < 0 && (errno == EINTR || errno == EAGAIN)) return 0; @@ -226,7 +221,6 @@ soread(struct socket *so) } } -#ifndef HAVE_READV /* * If there was no error, try and read the second time round * We read again if n = 2 (ie, there's another part of the buffer) @@ -244,7 +238,6 @@ soread(struct socket *so) } DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn)); -#endif /* Update fields */ sb->sb_cc += nn; @@ -452,13 +445,7 @@ sowrite(struct socket *so) } /* Check if there's urgent data to send, and if so, send it */ -#ifdef HAVE_READV - nn = writev(so->s, (const struct iovec *)iov, n); - - DEBUG_MISC((dfd, " ... wrote nn = %d bytes\n", nn)); -#else nn = slirp_send(so, iov[0].iov_base, iov[0].iov_len,0); -#endif /* This should never happen, but people tell me it does *shrug* */ if (nn < 0 && (errno == EAGAIN || errno == EINTR)) return 0; @@ -467,7 +454,6 @@ sowrite(struct socket *so) goto err_disconnected; } -#ifndef HAVE_READV if (n == 2 && nn == iov[0].iov_len) { int ret; ret = slirp_send(so, iov[1].iov_base, iov[1].iov_len,0); @@ -475,7 +461,6 @@ sowrite(struct socket *so) nn += ret; } DEBUG_MISC((dfd, " ... wrote nn = %d bytes\n", nn)); -#endif /* Update sbuf */ sb->sb_cc -= nn;