X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Finterface_output.c;h=251ff34ac9a11402a2538db6740a2c3b917198ee;hb=6a7cff7ec234af8529ff72a530076e191cc8d759;hp=beeb62a2db4dbd392920147b9b10928b63dceea8;hpb=be30fea370ed7cfe6a4a1b154a944411ec3eabd0;p=vpp.git diff --git a/src/vnet/interface_output.c b/src/vnet/interface_output.c index beeb62a2db4..251ff34ac9a 100644 --- a/src/vnet/interface_output.c +++ b/src/vnet/interface_output.c @@ -47,7 +47,10 @@ typedef struct { u32 sw_if_index; - u8 data[128 - sizeof (u32)]; + u32 flags; + u16 gso_size; + u8 gso_l4_hdr_sz; + u8 data[128 - 3 * sizeof (u32)]; } interface_output_trace_t; @@ -69,24 +72,30 @@ format_vnet_interface_output_trace (u8 * s, va_list * va) (vnm->interface_main.sw_interfaces, t->sw_if_index)) { /* the interface may have been deleted by the time the trace is printed */ - s = format (s, "sw_if_index: %d\n%U%U", - t->sw_if_index, - format_white_space, indent, - node->format_buffer ? node-> - format_buffer : format_hex_bytes, t->data, - sizeof (t->data)); + s = format (s, "sw_if_index: %d ", t->sw_if_index); } else { si = vnet_get_sw_interface (vnm, t->sw_if_index); - - s = format (s, "%U\n%U%U", - format_vnet_sw_interface_name, vnm, si, - format_white_space, indent, - node->format_buffer ? node-> - format_buffer : format_hex_bytes, t->data, - sizeof (t->data)); + s = + format (s, "%U ", format_vnet_sw_interface_name, vnm, si, + t->flags); + } +#define _(bit, name, v, x) \ + if (v && (t->flags & VNET_BUFFER_F_##name)) \ + s = format (s, "%s ", v); + foreach_vnet_buffer_flag +#undef _ + if (t->flags & VNET_BUFFER_F_GSO) + { + s = format (s, "\n%Ugso_sz %d gso_l4_hdr_sz %d", + format_white_space, indent + 2, t->gso_size, + t->gso_l4_hdr_sz); } + s = + format (s, "\n%U%U", format_white_space, indent, + node->format_buffer ? node->format_buffer : format_hex_bytes, + t->data, sizeof (t->data)); } return s; } @@ -121,6 +130,9 @@ vnet_interface_output_trace (vlib_main_t * vm, { t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0])); t0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX]; + t0->flags = b0->flags; + t0->gso_size = vnet_buffer2 (b0)->gso_size; + t0->gso_l4_hdr_sz = vnet_buffer2 (b0)->gso_l4_hdr_sz; clib_memcpy_fast (t0->data, vlib_buffer_get_current (b0), sizeof (t0->data)); } @@ -128,6 +140,9 @@ vnet_interface_output_trace (vlib_main_t * vm, { t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0])); t1->sw_if_index = vnet_buffer (b1)->sw_if_index[VLIB_TX]; + t1->flags = b1->flags; + t1->gso_size = vnet_buffer2 (b1)->gso_size; + t1->gso_l4_hdr_sz = vnet_buffer2 (b1)->gso_l4_hdr_sz; clib_memcpy_fast (t1->data, vlib_buffer_get_current (b1), sizeof (t1->data)); } @@ -149,6 +164,9 @@ vnet_interface_output_trace (vlib_main_t * vm, { t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0])); t0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX]; + t0->flags = b0->flags; + t0->gso_size = vnet_buffer2 (b0)->gso_size; + t0->gso_l4_hdr_sz = vnet_buffer2 (b0)->gso_l4_hdr_sz; clib_memcpy_fast (t0->data, vlib_buffer_get_current (b0), sizeof (t0->data)); } @@ -192,9 +210,17 @@ calc_checksums (vlib_main_t * vm, vlib_buffer_t * b) { int bogus; if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM) - th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus); + { + th->checksum = 0; + th->checksum = + ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus); + } if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM) - uh->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus); + { + uh->checksum = 0; + uh->checksum = + ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus); + } } b->flags &= ~VNET_BUFFER_F_OFFLOAD_TCP_CKSUM; @@ -202,12 +228,245 @@ calc_checksums (vlib_main_t * vm, vlib_buffer_t * b) b->flags &= ~VNET_BUFFER_F_OFFLOAD_IP_CKSUM; } +static_always_inline u16 +tso_alloc_tx_bufs (vlib_main_t * vm, + vnet_interface_per_thread_data_t * ptd, + vlib_buffer_t * b0, u16 l4_hdr_sz) +{ + u32 n_bytes_b0 = vlib_buffer_length_in_chain (vm, b0); + u16 gso_size = vnet_buffer2 (b0)->gso_size; + u16 l234_sz = vnet_buffer (b0)->l4_hdr_offset + l4_hdr_sz; + /* rounded-up division */ + u16 n_bufs = (n_bytes_b0 - l234_sz + (gso_size - 1)) / gso_size; + u16 n_alloc; + + ASSERT (n_bufs > 0); + vec_validate (ptd->split_buffers, n_bufs - 1); + + n_alloc = vlib_buffer_alloc (vm, ptd->split_buffers, n_bufs); + if (n_alloc < n_bufs) + { + vlib_buffer_free (vm, ptd->split_buffers, n_alloc); + return 0; + } + return 1; +} + +static_always_inline void +tso_init_buf_from_template_base (vlib_buffer_t * nb0, vlib_buffer_t * b0, + u32 flags, u16 length) +{ + nb0->current_data = 0; + nb0->total_length_not_including_first_buffer = 0; + nb0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID | flags; + clib_memcpy_fast (&nb0->opaque, &b0->opaque, sizeof (nb0->opaque)); + clib_memcpy_fast (nb0->data, b0->data, length); + nb0->current_length = length; +} + +static_always_inline void +tso_init_buf_from_template (vlib_main_t * vm, vlib_buffer_t * nb0, + vlib_buffer_t * b0, u16 template_data_sz, + u16 gso_size, u8 ** p_dst_ptr, u16 * p_dst_left, + u32 next_tcp_seq, u32 flags) +{ + tso_init_buf_from_template_base (nb0, b0, flags, template_data_sz); + + *p_dst_left = + clib_min (gso_size, + vlib_buffer_get_default_data_size (vm) - template_data_sz); + *p_dst_ptr = nb0->data + template_data_sz; + + tcp_header_t *tcp = + (tcp_header_t *) (nb0->data + vnet_buffer (nb0)->l4_hdr_offset); + tcp->seq_number = clib_host_to_net_u32 (next_tcp_seq); +} + +static_always_inline void +tso_fixup_segmented_buf (vlib_buffer_t * b0, u8 tcp_flags, int is_ip6) +{ + u16 l3_hdr_offset = vnet_buffer (b0)->l3_hdr_offset; + u16 l4_hdr_offset = vnet_buffer (b0)->l4_hdr_offset; + ip4_header_t *ip4 = (ip4_header_t *) (b0->data + l3_hdr_offset); + ip6_header_t *ip6 = (ip6_header_t *) (b0->data + l3_hdr_offset); + tcp_header_t *tcp = (tcp_header_t *) (b0->data + l4_hdr_offset); + + tcp->flags = tcp_flags; + + if (is_ip6) + ip6->payload_length = + clib_host_to_net_u16 (b0->current_length - + vnet_buffer (b0)->l4_hdr_offset); + else + ip4->length = + clib_host_to_net_u16 (b0->current_length - + vnet_buffer (b0)->l3_hdr_offset); +} + +/** + * Allocate the necessary number of ptd->split_buffers, + * and segment the possibly chained buffer(s) from b0 into + * there. + * + * Return the cumulative number of bytes sent or zero + * if allocation failed. + */ + +static_always_inline u32 +tso_segment_buffer (vlib_main_t * vm, vnet_interface_per_thread_data_t * ptd, + int do_tx_offloads, u32 sbi0, vlib_buffer_t * sb0, + u32 n_bytes_b0) +{ + u32 n_tx_bytes = 0; + int is_ip4 = sb0->flags & VNET_BUFFER_F_IS_IP4; + int is_ip6 = sb0->flags & VNET_BUFFER_F_IS_IP6; + ASSERT (is_ip4 || is_ip6); + ASSERT (sb0->flags & VNET_BUFFER_F_L2_HDR_OFFSET_VALID); + ASSERT (sb0->flags & VNET_BUFFER_F_L3_HDR_OFFSET_VALID); + ASSERT (sb0->flags & VNET_BUFFER_F_L4_HDR_OFFSET_VALID); + u16 gso_size = vnet_buffer2 (sb0)->gso_size; + + int l4_hdr_sz = vnet_buffer2 (sb0)->gso_l4_hdr_sz; + u8 save_tcp_flags = 0; + u8 tcp_flags_no_fin_psh = 0; + u32 next_tcp_seq = 0; + + tcp_header_t *tcp = + (tcp_header_t *) (sb0->data + vnet_buffer (sb0)->l4_hdr_offset); + next_tcp_seq = clib_net_to_host_u32 (tcp->seq_number); + /* store original flags for last packet and reset FIN and PSH */ + save_tcp_flags = tcp->flags; + tcp_flags_no_fin_psh = tcp->flags & ~(TCP_FLAG_FIN | TCP_FLAG_PSH); + tcp->checksum = 0; + + u32 default_bflags = + sb0->flags & ~(VNET_BUFFER_F_GSO | VLIB_BUFFER_NEXT_PRESENT); + u16 l234_sz = vnet_buffer (sb0)->l4_hdr_offset + l4_hdr_sz; + int first_data_size = clib_min (gso_size, sb0->current_length - l234_sz); + next_tcp_seq += first_data_size; + + if (PREDICT_FALSE (!tso_alloc_tx_bufs (vm, ptd, sb0, l4_hdr_sz))) + return 0; + + vlib_buffer_t *b0 = vlib_get_buffer (vm, ptd->split_buffers[0]); + tso_init_buf_from_template_base (b0, sb0, default_bflags, + l4_hdr_sz + first_data_size); + + u32 total_src_left = n_bytes_b0 - l234_sz - first_data_size; + if (total_src_left) + { + /* Need to copy more segments */ + u8 *src_ptr, *dst_ptr; + u16 src_left, dst_left; + /* current source buffer */ + vlib_buffer_t *csb0 = sb0; + u32 csbi0 = sbi0; + /* current dest buffer */ + vlib_buffer_t *cdb0; + u16 dbi = 1; /* the buffer [0] is b0 */ + + src_ptr = sb0->data + l234_sz + first_data_size; + src_left = sb0->current_length - l234_sz - first_data_size; + b0->current_length = l234_sz + first_data_size; + + tso_fixup_segmented_buf (b0, tcp_flags_no_fin_psh, is_ip6); + if (do_tx_offloads) + calc_checksums (vm, b0); + + /* grab a second buffer and prepare the loop */ + ASSERT (dbi < vec_len (ptd->split_buffers)); + cdb0 = vlib_get_buffer (vm, ptd->split_buffers[dbi++]); + tso_init_buf_from_template (vm, cdb0, b0, l234_sz, gso_size, &dst_ptr, + &dst_left, next_tcp_seq, default_bflags); + + /* an arbitrary large number to catch the runaway loops */ + int nloops = 2000; + while (total_src_left) + { + ASSERT (nloops-- > 0); + u16 bytes_to_copy = clib_min (src_left, dst_left); + + clib_memcpy_fast (dst_ptr, src_ptr, bytes_to_copy); + + src_left -= bytes_to_copy; + src_ptr += bytes_to_copy; + total_src_left -= bytes_to_copy; + dst_left -= bytes_to_copy; + dst_ptr += bytes_to_copy; + next_tcp_seq += bytes_to_copy; + cdb0->current_length += bytes_to_copy; + + if (0 == src_left) + { + int has_next = (csb0->flags & VLIB_BUFFER_NEXT_PRESENT); + u32 next_bi = csb0->next_buffer; + + /* init src to the next buffer in chain */ + if (has_next) + { + csbi0 = next_bi; + csb0 = vlib_get_buffer (vm, csbi0); + src_left = csb0->current_length; + src_ptr = csb0->data; + } + else + { + ASSERT (total_src_left == 0); + break; + } + } + if (0 == dst_left && total_src_left) + { + if (do_tx_offloads) + calc_checksums (vm, cdb0); + n_tx_bytes += cdb0->current_length; + ASSERT (dbi < vec_len (ptd->split_buffers)); + cdb0 = vlib_get_buffer (vm, ptd->split_buffers[dbi++]); + tso_init_buf_from_template (vm, cdb0, b0, l234_sz, + gso_size, &dst_ptr, &dst_left, + next_tcp_seq, default_bflags); + } + } + + tso_fixup_segmented_buf (cdb0, save_tcp_flags, is_ip6); + if (do_tx_offloads) + calc_checksums (vm, cdb0); + + n_tx_bytes += cdb0->current_length; + } + n_tx_bytes += b0->current_length; + return n_tx_bytes; +} + +static_always_inline void +drop_one_buffer_and_count (vlib_main_t * vm, vnet_main_t * vnm, + vlib_node_runtime_t * node, u32 * pbi0, + u32 drop_error_code) +{ + u32 thread_index = vm->thread_index; + vnet_interface_output_runtime_t *rt = (void *) node->runtime_data; + + vlib_simple_counter_main_t *cm; + cm = + vec_elt_at_index (vnm->interface_main.sw_if_counters, + VNET_INTERFACE_COUNTER_TX_ERROR); + vlib_increment_simple_counter (cm, thread_index, rt->sw_if_index, 1); + + vlib_error_drop_buffers (vm, node, pbi0, + /* buffer stride */ 1, + /* n_buffers */ 1, + VNET_INTERFACE_OUTPUT_NEXT_DROP, + node->node_index, drop_error_code); +} + static_always_inline uword -vnet_interface_output_node_inline (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame, vnet_main_t * vnm, - vnet_hw_interface_t * hi, - int do_tx_offloads) +vnet_interface_output_node_inline_gso (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame, + vnet_main_t * vnm, + vnet_hw_interface_t * hi, + int do_tx_offloads, + int do_segmentation) { vnet_interface_output_runtime_t *rt = (void *) node->runtime_data; vnet_sw_interface_t *si; @@ -219,6 +478,8 @@ vnet_interface_output_node_inline (vlib_main_t * vm, u32 next_index = VNET_INTERFACE_OUTPUT_NEXT_TX; u32 current_config_index = ~0; u8 arc = im->output_feature_arc_index; + vnet_interface_per_thread_data_t *ptd = + vec_elt_at_index (im->per_thread_data, thread_index); n_buffers = frame->n_vectors; @@ -300,15 +561,30 @@ vnet_interface_output_node_inline (vlib_main_t * vm, to_tx[1] = bi1; to_tx[2] = bi2; to_tx[3] = bi3; - from += 4; - to_tx += 4; - n_left_to_tx -= 4; + if (!do_segmentation) + { + from += 4; + to_tx += 4; + n_left_to_tx -= 4; + } b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); b2 = vlib_get_buffer (vm, bi2); b3 = vlib_get_buffer (vm, bi3); + if (do_segmentation) + { + or_flags = b0->flags | b1->flags | b2->flags | b3->flags; + + /* go to single loop if we need TSO segmentation */ + if (PREDICT_FALSE (or_flags & VNET_BUFFER_F_GSO)) + break; + from += 4; + to_tx += 4; + n_left_to_tx -= 4; + } + /* Be grumpy about zero length buffers for benefit of driver tx function. */ ASSERT (b0->current_length > 0); @@ -376,7 +652,8 @@ vnet_interface_output_node_inline (vlib_main_t * vm, n_bytes_b3); } - or_flags = b0->flags | b1->flags | b2->flags | b3->flags; + if (!do_segmentation) + or_flags = b0->flags | b1->flags | b2->flags | b3->flags; if (do_tx_offloads) { @@ -422,6 +699,85 @@ vnet_interface_output_node_inline (vlib_main_t * vm, b0->current_config_index = current_config_index; } + if (do_segmentation) + { + if (PREDICT_FALSE (b0->flags & VNET_BUFFER_F_GSO)) + { + /* + * Undo the enqueue of the b0 - it is not going anywhere, + * and will be freed either after it's segmented or + * when dropped, if there is no buffers to segment into. + */ + to_tx -= 1; + n_left_to_tx += 1; + /* undo the counting. */ + n_bytes -= n_bytes_b0; + n_packets -= 1; + + u32 n_tx_bytes = 0; + + n_tx_bytes = + tso_segment_buffer (vm, ptd, do_tx_offloads, bi0, b0, + n_bytes_b0); + + if (PREDICT_FALSE (n_tx_bytes == 0)) + { + drop_one_buffer_and_count (vm, vnm, node, from - 1, + VNET_INTERFACE_OUTPUT_ERROR_NO_BUFFERS_FOR_GSO); + continue; + } + + u16 n_tx_bufs = vec_len (ptd->split_buffers); + u32 *from_tx_seg = ptd->split_buffers; + + while (n_tx_bufs > 0) + { + if (n_tx_bufs >= n_left_to_tx) + { + while (n_left_to_tx > 0) + { + to_tx[0] = from_tx_seg[0]; + to_tx += 1; + from_tx_seg += 1; + n_left_to_tx -= 1; + n_tx_bufs -= 1; + n_packets += 1; + } + vlib_put_next_frame (vm, node, next_index, + n_left_to_tx); + vlib_get_new_next_frame (vm, node, next_index, + to_tx, n_left_to_tx); + } + else + { + while (n_tx_bufs > 0) + { + to_tx[0] = from_tx_seg[0]; + to_tx += 1; + from_tx_seg += 1; + n_left_to_tx -= 1; + n_tx_bufs -= 1; + n_packets += 1; + } + } + } + n_bytes += n_tx_bytes; + if (PREDICT_FALSE (tx_swif0 != rt->sw_if_index)) + { + + vlib_increment_combined_counter + (im->combined_sw_if_counters + + VNET_INTERFACE_COUNTER_TX, thread_index, tx_swif0, + _vec_len (ptd->split_buffers), n_tx_bytes); + } + /* The buffers were enqueued. Reset the length */ + _vec_len (ptd->split_buffers) = 0; + /* Free the now segmented buffer */ + vlib_buffer_free_one (vm, bi0); + continue; + } + } + if (PREDICT_FALSE (tx_swif0 != rt->sw_if_index)) { @@ -446,6 +802,33 @@ vnet_interface_output_node_inline (vlib_main_t * vm, return n_buffers; } +static_always_inline uword +vnet_interface_output_node_inline (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame, vnet_main_t * vnm, + vnet_hw_interface_t * hi, + int do_tx_offloads) +{ + /* + * The 3-headed "if" is here because we want to err on the side + * of not impacting the non-GSO performance - so for the more + * common case of no GSO interfaces we want to prevent the + * segmentation codepath from being there altogether. + */ + if (PREDICT_TRUE (vnm->interface_main.gso_interface_count == 0)) + return vnet_interface_output_node_inline_gso (vm, node, frame, vnm, hi, + do_tx_offloads, + /* do_segmentation */ 0); + else if (hi->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) + return vnet_interface_output_node_inline_gso (vm, node, frame, vnm, hi, + do_tx_offloads, + /* do_segmentation */ 0); + else + return vnet_interface_output_node_inline_gso (vm, node, frame, vnm, hi, + do_tx_offloads, + /* do_segmentation */ 1); +} + uword vnet_interface_output_node (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)