From 3642782a2748503f5b5ccf89d1575c1d489948ef Mon Sep 17 00:00:00 2001 From: Srikanth A Date: Wed, 2 Oct 2019 17:48:58 -0700 Subject: tcp: custom checksum calculations for Ipv4/Ipv6 Type: feature Based on the configuration, we can disable checksum offload capability and calculate checksum while pushing the TCP & IP header. This saves some cycles when VPP stack is used in legacy hardware devices. Signed-off-by: Srikanth A Change-Id: Ic1b3fcf3040917e47ee65263694ebf7437ac5668 --- src/vnet/ip/ip6_forward.c | 69 +++++++++-------------------------------------- 1 file changed, 13 insertions(+), 56 deletions(-) (limited to 'src/vnet/ip/ip6_forward.c') diff --git a/src/vnet/ip/ip6_forward.c b/src/vnet/ip/ip6_forward.c index eb6c89b39d7..a7a41eea419 100644 --- a/src/vnet/ip/ip6_forward.c +++ b/src/vnet/ip/ip6_forward.c @@ -1014,11 +1014,10 @@ ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0, ip6_header_t * ip0, int *bogus_lengthp) { ip_csum_t sum0; - u16 sum16, payload_length_host_byte_order; - u32 i, n_this_buffer, n_bytes_left; + u16 payload_length_host_byte_order; + u32 i; u32 headers_size = sizeof (ip0[0]); u8 *data_this_buffer; - u8 length_odd; ASSERT (bogus_lengthp); *bogus_lengthp = 0; @@ -1030,14 +1029,10 @@ ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0, for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++) { - sum0 = ip_csum_with_carry (sum0, - clib_mem_unaligned (&ip0-> - src_address.as_uword[i], - uword)); - sum0 = - ip_csum_with_carry (sum0, - clib_mem_unaligned (&ip0->dst_address.as_uword[i], - uword)); + sum0 = ip_csum_with_carry + (sum0, clib_mem_unaligned (&ip0->src_address.as_uword[i], uword)); + sum0 = ip_csum_with_carry + (sum0, clib_mem_unaligned (&ip0->dst_address.as_uword[i], uword)); } /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) @@ -1059,52 +1054,14 @@ ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0, headers_size += skip_bytes; } - n_bytes_left = n_this_buffer = payload_length_host_byte_order; - if (p0) - { - u32 n_ip_bytes_this_buffer = - p0->current_length - (((u8 *) ip0 - p0->data) - p0->current_data); - if (n_this_buffer + headers_size > n_ip_bytes_this_buffer) - { - n_this_buffer = p0->current_length > headers_size ? - n_ip_bytes_this_buffer - headers_size : 0; - } - } - - while (1) - { - sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer); - n_bytes_left -= n_this_buffer; - if (n_bytes_left == 0) - break; - - ASSERT (p0->flags & VLIB_BUFFER_NEXT_PRESENT); - if (!(p0->flags & VLIB_BUFFER_NEXT_PRESENT)) - { - *bogus_lengthp = 1; - return 0xfefe; - } - - length_odd = (n_this_buffer & 1); - - p0 = vlib_get_buffer (vm, p0->next_buffer); - data_this_buffer = vlib_buffer_get_current (p0); - n_this_buffer = clib_min (p0->current_length, n_bytes_left); - - if (PREDICT_FALSE (length_odd)) - { - /* Prepend a 0 or the resulting checksum will be incorrect. */ - data_this_buffer--; - n_this_buffer++; - n_bytes_left++; - data_this_buffer[0] = 0; - } - } - - sum16 = ~ip_csum_fold (sum0); - - return sum16; + return ip_calculate_l4_checksum (vm, p0, sum0, + payload_length_host_byte_order, + (u8 *) ip0, headers_size, NULL); + else + return ip_calculate_l4_checksum (vm, 0, sum0, + payload_length_host_byte_order, NULL, 0, + data_this_buffer); } u32 -- cgit 1.2.3-korg