On Wed, May 29, 2019 at 1:58 AM Matteo Croce <mcr...@redhat.com> wrote:
>
> Commit 283c16a2dfd3 ("indirect call wrappers: helpers to speed-up
> indirect calls of builtin") introduces some macros to avoid doing
> indirect calls.
>
> Use these helpers to remove two indirect calls in the L4 checksum
> calculation for devices which don't have hardware support for it.
>
> As a test I generate packets with pktgen out to a dummy interface
> with HW checksumming disabled, to have the checksum calculated in
> every sent packet.
> The packet rate measured with an i7-6700K CPU and a single pktgen
> thread raised from 6143 to 6608 Kpps, an increase by 7.5%
>
> Suggested-by: Davide Caratti <dcara...@redhat.com>
> Signed-off-by: Matteo Croce <mcr...@redhat.com>I found a build error with CONFIG_LIBCRC32C=m: ld: net/core/skbuff.o: in function `sctp_csum_update': skbuff.c:(.text+0x2640): undefined reference to `crc32c' ld: net/core/skbuff.o: in function `__skb_checksum': (.text+0x2aba): undefined reference to `crc32c' ld: (.text+0x2cf9): undefined reference to `crc32c' I have two possible solutions for this: - use INDIRECT_CALL_1 and leave the SCTP callback called by an indirect pointer - use IS_BUILTIN(CONFIG_LIBCRC32C) around the sctp_csum_combine usage I'm more toward the first one, which will also avoid the net/sctp/checksum.h inclusion. -- Matteo Croce per aspera ad upstream
