From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:50093) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1S9CSB-0006iQ-Mb for qemu-devel@nongnu.org; Sun, 18 Mar 2012 05:31:09 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1S9CS9-0001CJ-Nv for qemu-devel@nongnu.org; Sun, 18 Mar 2012 05:31:07 -0400 Received: from na3sys010aog113.obsmtp.com ([74.125.245.94]:37580) by eggs.gnu.org with smtp (Exim 4.71) (envelope-from ) id 1S9CS9-0001C4-GE for qemu-devel@nongnu.org; Sun, 18 Mar 2012 05:31:05 -0400 Received: by mail-wi0-f178.google.com with SMTP id hq7so2065367wib.13 for ; Sun, 18 Mar 2012 02:31:03 -0700 (PDT) From: Dmitry Fleytman Date: Sun, 18 Mar 2012 11:26:58 +0200 Message-Id: <1332062822-14342-4-git-send-email-dmitry.fleytman@ravellosystems.com> In-Reply-To: <1332062822-14342-1-git-send-email-dmitry.fleytman@ravellosystems.com> References: <1332062822-14342-1-git-send-email-dmitry.fleytman@ravellosystems.com> Subject: [Qemu-devel] [PATCH 3/7 v5] Adding utility function iov_net_csum_add() for iovec checksum calculation List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Anthony Liguori , Alex Fishman , "Michael S. Tsirkin" , Tamir Shomer , yvugenfi@redhat.com, Izik Eidus , Dmitry Fleytman , Yan Vugenfirer , Dmitry Fleytman Signed-off-by: Dmitry Fleytman Signed-off-by: Yan Vugenfirer --- iov.c | 29 +++++++++++++++++++++++++++++ iov.h | 3 +++ 2 files changed, 32 insertions(+), 0 deletions(-) diff --git a/iov.c b/iov.c index 0f96493..5d4f94c 100644 --- a/iov.c +++ b/iov.c @@ -16,6 +16,7 @@ */ #include "iov.h" +#include "net/checksum.h" size_t iov_from_buf(struct iovec *iov, unsigned int iov_cnt, const void *buf, size_t iov_off, size_t size) @@ -130,3 +131,31 @@ void iov_hexdump(const struct iovec *iov, const unsigned int iov_cnt, fprintf(fp, "\n"); } } + +uint32_t +iov_net_csum_add(const struct iovec *iov, const unsigned int iov_cnt, + size_t iov_off, size_t size) +{ + size_t iovec_off, buf_off; + unsigned int i; + uint32_t res = 0; + uint32_t seq = 0; + + iovec_off = 0; + buf_off = 0; + for (i = 0; i < iov_cnt && size; i++) { + if (iov_off < (iovec_off + iov[i].iov_len)) { + size_t len = MIN((iovec_off + iov[i].iov_len) - iov_off , size); + void *chunk_buf = iov[i].iov_base + (iov_off - iovec_off); + + res += net_checksum_add_cont(len, chunk_buf, seq); + seq += len; + + buf_off += len; + iov_off += len; + size -= len; + } + iovec_off += iov[i].iov_len; + } + return res; +} diff --git a/iov.h b/iov.h index 94d2f78..ba385f5 100644 --- a/iov.h +++ b/iov.h @@ -21,3 +21,6 @@ size_t iov_clear(const struct iovec *iov, const unsigned int iov_cnt, size_t iov_off, size_t size); void iov_hexdump(const struct iovec *iov, const unsigned int iov_cnt, FILE *fp, const char *prefix, size_t limit); +uint32_t +iov_net_csum_add(const struct iovec *iov, const unsigned int iov_cnt, + size_t iov_off, size_t size); -- 1.7.7.6