X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvlib%2Fbuffer_funcs.h;h=e65a80bfad8c20ffa90bfbc6cad866f308825b03;hb=7444fd2a0d177796cacb7c040323cdc327afa97a;hp=2ba9f1cb894903291668e341c30d2e387b52485a;hpb=b6e8b1a7c8bf9f9fbd05cdc3c90111d9e7a6897b;p=vpp.git diff --git a/src/vlib/buffer_funcs.h b/src/vlib/buffer_funcs.h index 2ba9f1cb894..e65a80bfad8 100644 --- a/src/vlib/buffer_funcs.h +++ b/src/vlib/buffer_funcs.h @@ -42,6 +42,7 @@ #include #include +#include #include #include #include @@ -51,6 +52,46 @@ vlib buffer access methods. */ +typedef void (vlib_buffer_enqueue_to_next_fn_t) (vlib_main_t *vm, + vlib_node_runtime_t *node, + u32 *buffers, u16 *nexts, + uword count); +typedef void (vlib_buffer_enqueue_to_next_with_aux_fn_t) ( + vlib_main_t *vm, vlib_node_runtime_t *node, u32 *buffers, u32 *aux_data, + u16 *nexts, uword count); +typedef void (vlib_buffer_enqueue_to_single_next_fn_t) ( + vlib_main_t *vm, vlib_node_runtime_t *node, u32 *ers, u16 next_index, + u32 count); + +typedef void (vlib_buffer_enqueue_to_single_next_with_aux_fn_t) ( + vlib_main_t *vm, vlib_node_runtime_t *node, u32 *ers, u32 *aux_data, + u16 next_index, u32 count); + +typedef u32 (vlib_buffer_enqueue_to_thread_fn_t) ( + vlib_main_t *vm, vlib_node_runtime_t *node, u32 frame_queue_index, + u32 *buffer_indices, u16 *thread_indices, u32 n_packets, + int drop_on_congestion); + +typedef u32 (vlib_buffer_enqueue_to_thread_with_aux_fn_t) ( + vlib_main_t *vm, vlib_node_runtime_t *node, u32 frame_queue_index, + u32 *buffer_indices, u32 *aux, u16 *thread_indices, u32 n_packets, + int drop_on_congestion); + +typedef struct +{ + vlib_buffer_enqueue_to_next_fn_t *buffer_enqueue_to_next_fn; + vlib_buffer_enqueue_to_next_with_aux_fn_t + *buffer_enqueue_to_next_with_aux_fn; + vlib_buffer_enqueue_to_single_next_fn_t *buffer_enqueue_to_single_next_fn; + vlib_buffer_enqueue_to_single_next_with_aux_fn_t + *buffer_enqueue_to_single_next_with_aux_fn; + vlib_buffer_enqueue_to_thread_fn_t *buffer_enqueue_to_thread_fn; + vlib_buffer_enqueue_to_thread_with_aux_fn_t + *buffer_enqueue_to_thread_with_aux_fn; +} vlib_buffer_func_main_t; + +extern vlib_buffer_func_main_t vlib_buffer_func_main; + always_inline void vlib_buffer_validate (vlib_main_t * vm, vlib_buffer_t * b) { @@ -101,46 +142,45 @@ vlib_buffer_get_default_data_size (vlib_main_t * vm) static_always_inline void vlib_buffer_copy_indices (u32 * dst, u32 * src, u32 n_indices) { -#if defined(CLIB_HAVE_VEC512) - while (n_indices >= 16) + clib_memcpy_u32 (dst, src, n_indices); +} + +always_inline void +vlib_buffer_copy_indices_from_ring (u32 * dst, u32 * ring, u32 start, + u32 ring_size, u32 n_buffers) +{ + ASSERT (n_buffers <= ring_size); + + if (PREDICT_TRUE (start + n_buffers <= ring_size)) { - u32x16_store_unaligned (u32x16_load_unaligned (src), dst); - dst += 16; - src += 16; - n_indices -= 16; + vlib_buffer_copy_indices (dst, ring + start, n_buffers); } -#endif - -#if defined(CLIB_HAVE_VEC256) - while (n_indices >= 8) + else { - u32x8_store_unaligned (u32x8_load_unaligned (src), dst); - dst += 8; - src += 8; - n_indices -= 8; + u32 n = ring_size - start; + vlib_buffer_copy_indices (dst, ring + start, n); + vlib_buffer_copy_indices (dst + n, ring, n_buffers - n); } -#endif +} -#if defined(CLIB_HAVE_VEC128) - while (n_indices >= 4) +always_inline void +vlib_buffer_copy_indices_to_ring (u32 * ring, u32 * src, u32 start, + u32 ring_size, u32 n_buffers) +{ + ASSERT (n_buffers <= ring_size); + + if (PREDICT_TRUE (start + n_buffers <= ring_size)) { - u32x4_store_unaligned (u32x4_load_unaligned (src), dst); - dst += 4; - src += 4; - n_indices -= 4; + vlib_buffer_copy_indices (ring + start, src, n_buffers); } -#endif - - while (n_indices) + else { - dst[0] = src[0]; - dst += 1; - src += 1; - n_indices -= 1; + u32 n = ring_size - start; + vlib_buffer_copy_indices (ring + start, src, n); + vlib_buffer_copy_indices (ring, src + n, n_buffers - n); } } -STATIC_ASSERT_OFFSET_OF (vlib_buffer_t, template_end, 64); static_always_inline void vlib_buffer_copy_template (vlib_buffer_t * b, vlib_buffer_t * bt) { @@ -175,61 +215,38 @@ vlib_buffer_pool_get_default_for_numa (vlib_main_t * vm, u32 numa_node) @param offset - (i32) offset applied to each pointer */ static_always_inline void -vlib_get_buffers_with_offset (vlib_main_t * vm, u32 * bi, void **b, int count, +vlib_get_buffers_with_offset (vlib_main_t *vm, u32 *bi, void **b, u32 count, i32 offset) { uword buffer_mem_start = vm->buffer_main->buffer_mem_start; -#ifdef CLIB_HAVE_VEC256 - u64x4 off = u64x4_splat (buffer_mem_start + offset); - /* if count is not const, compiler will not unroll while loop - se we maintain two-in-parallel variant */ - while (count >= 8) - { - u64x4 b0 = u32x4_extend_to_u64x4 (u32x4_load_unaligned (bi)); - u64x4 b1 = u32x4_extend_to_u64x4 (u32x4_load_unaligned (bi + 4)); - /* shift and add to get vlib_buffer_t pointer */ - u64x4_store_unaligned ((b0 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b); - u64x4_store_unaligned ((b1 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b + 4); - b += 8; - bi += 8; - count -= 8; - } -#endif - while (count >= 4) - { -#ifdef CLIB_HAVE_VEC256 - u64x4 b0 = u32x4_extend_to_u64x4 (u32x4_load_unaligned (bi)); - /* shift and add to get vlib_buffer_t pointer */ - u64x4_store_unaligned ((b0 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b); -#elif defined (CLIB_HAVE_VEC128) - u64x2 off = u64x2_splat (buffer_mem_start + offset); - u32x4 bi4 = u32x4_load_unaligned (bi); - u64x2 b0 = u32x4_extend_to_u64x2 ((u32x4) bi4); -#if defined (__aarch64__) - u64x2 b1 = u32x4_extend_to_u64x2_high ((u32x4) bi4); -#else - bi4 = u32x4_shuffle (bi4, 2, 3, 0, 1); - u64x2 b1 = u32x4_extend_to_u64x2 ((u32x4) bi4); -#endif - u64x2_store_unaligned ((b0 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b); - u64x2_store_unaligned ((b1 << CLIB_LOG2_CACHE_LINE_BYTES) + off, b + 2); -#else - b[0] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[0], offset); - b[1] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[1], offset); - b[2] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[2], offset); - b[3] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[3], offset); -#endif - b += 4; - bi += 4; - count -= 4; - } - while (count) + void *base = (void *) (buffer_mem_start + offset); + int objsize = __builtin_object_size (b, 0); + const int sh = CLIB_LOG2_CACHE_LINE_BYTES; + + if (COMPILE_TIME_CONST (count) == 0 && objsize >= 64 * sizeof (b[0]) && + (objsize & ((8 * sizeof (b[0])) - 1)) == 0) { - b[0] = vlib_buffer_ptr_from_index (buffer_mem_start, bi[0], offset); - b += 1; - bi += 1; - count -= 1; + u32 n = round_pow2 (count, 8); + ASSERT (objsize >= count); + CLIB_ASSUME (objsize >= count); + while (n >= 64) + { + clib_index_to_ptr_u32 (bi, base, sh, b, 64); + b += 64; + bi += 64; + n -= 64; + } + + while (n) + { + clib_index_to_ptr_u32 (bi, base, sh, b, 8); + b += 8; + bi += 8; + n -= 8; + } } + else + clib_index_to_ptr_u32 (bi, base, sh, b, count); } /** \brief Translate array of buffer indices into buffer pointers @@ -241,7 +258,7 @@ vlib_get_buffers_with_offset (vlib_main_t * vm, u32 * bi, void **b, int count, */ static_always_inline void -vlib_get_buffers (vlib_main_t * vm, u32 * bi, vlib_buffer_t ** b, int count) +vlib_get_buffers (vlib_main_t *vm, u32 *bi, vlib_buffer_t **b, u32 count) { vlib_get_buffers_with_offset (vm, bi, (void **) b, count, 0); } @@ -474,6 +491,13 @@ vlib_buffer_is_known (vlib_main_t * vm, u32 buffer_index) u8 *vlib_validate_buffer (vlib_main_t * vm, u32 buffer_index, uword follow_chain); +u8 *vlib_validate_buffers (vlib_main_t * vm, + u32 * buffers, + uword next_buffer_stride, + uword n_buffers, + vlib_buffer_known_state_t known_state, + uword follow_buffer_next); + static_always_inline vlib_buffer_pool_t * vlib_get_buffer_pool (vlib_main_t * vm, u8 buffer_pool_index) { @@ -481,7 +505,7 @@ vlib_get_buffer_pool (vlib_main_t * vm, u8 buffer_pool_index) return vec_elt_at_index (bm->buffer_pools, buffer_pool_index); } -static_always_inline uword +static_always_inline __clib_warn_unused_result uword vlib_buffer_pool_get (vlib_main_t * vm, u8 buffer_pool_index, u32 * buffers, u32 n_buffers) { @@ -519,7 +543,7 @@ vlib_buffer_pool_get (vlib_main_t * vm, u8 buffer_pool_index, u32 * buffers, less than the number requested or zero */ -always_inline u32 +always_inline __clib_warn_unused_result u32 vlib_buffer_alloc_from_pool (vlib_main_t * vm, u32 * buffers, u32 n_buffers, u8 buffer_pool_index) { @@ -528,6 +552,17 @@ vlib_buffer_alloc_from_pool (vlib_main_t * vm, u32 * buffers, u32 n_buffers, vlib_buffer_pool_thread_t *bpt; u32 *src, *dst, len, n_left; + /* If buffer allocation fault injection is configured */ + if (VLIB_BUFFER_ALLOC_FAULT_INJECTOR > 0) + { + u32 vlib_buffer_alloc_may_fail (vlib_main_t *, u32); + + /* See how many buffers we're willing to allocate */ + n_buffers = vlib_buffer_alloc_may_fail (vm, n_buffers); + if (n_buffers == 0) + return (n_buffers); + } + bp = vec_elt_at_index (bm->buffer_pools, buffer_pool_index); bpt = vec_elt_at_index (bp->threads, vm->thread_index); @@ -541,11 +576,7 @@ vlib_buffer_alloc_from_pool (vlib_main_t * vm, u32 * buffers, u32 n_buffers, src = bpt->cached_buffers + len - n_buffers; vlib_buffer_copy_indices (dst, src, n_buffers); bpt->n_cached -= n_buffers; - - if (CLIB_DEBUG > 0) - vlib_buffer_validate_alloc_free (vm, buffers, n_buffers, - VLIB_BUFFER_KNOWN_FREE); - return n_buffers; + goto done; } /* alloc bigger than cache - take buffers directly from main pool */ @@ -553,11 +584,7 @@ vlib_buffer_alloc_from_pool (vlib_main_t * vm, u32 * buffers, u32 n_buffers, { n_buffers = vlib_buffer_pool_get (vm, buffer_pool_index, buffers, n_buffers); - - if (CLIB_DEBUG > 0) - vlib_buffer_validate_alloc_free (vm, buffers, n_buffers, - VLIB_BUFFER_KNOWN_FREE); - return n_buffers; + goto done; } /* take everything available in the cache */ @@ -585,11 +612,13 @@ vlib_buffer_alloc_from_pool (vlib_main_t * vm, u32 * buffers, u32 n_buffers, n_buffers -= n_left; +done: /* Verify that buffers are known free. */ if (CLIB_DEBUG > 0) vlib_buffer_validate_alloc_free (vm, buffers, n_buffers, VLIB_BUFFER_KNOWN_FREE); - + if (PREDICT_FALSE (bm->alloc_callback_fn != 0)) + bm->alloc_callback_fn (vm, buffer_pool_index, buffers, n_buffers); return n_buffers; } @@ -602,7 +631,7 @@ vlib_buffer_alloc_from_pool (vlib_main_t * vm, u32 * buffers, u32 n_buffers, @return - (u32) number of buffers actually allocated, may be less than the number requested or zero */ -always_inline u32 +always_inline __clib_warn_unused_result u32 vlib_buffer_alloc_on_numa (vlib_main_t * vm, u32 * buffers, u32 n_buffers, u32 numa_node) { @@ -619,7 +648,7 @@ vlib_buffer_alloc_on_numa (vlib_main_t * vm, u32 * buffers, u32 n_buffers, less than the number requested or zero */ -always_inline u32 +always_inline __clib_warn_unused_result u32 vlib_buffer_alloc (vlib_main_t * vm, u32 * buffers, u32 n_buffers) { return vlib_buffer_alloc_on_numa (vm, buffers, n_buffers, vm->numa_node); @@ -635,7 +664,7 @@ vlib_buffer_alloc (vlib_main_t * vm, u32 * buffers, u32 n_buffers) @return - (u32) number of buffers actually allocated, may be less than the number requested or zero */ -always_inline u32 +always_inline __clib_warn_unused_result u32 vlib_buffer_alloc_to_ring (vlib_main_t * vm, u32 * ring, u32 start, u32 ring_size, u32 n_buffers) { @@ -664,7 +693,7 @@ vlib_buffer_alloc_to_ring (vlib_main_t * vm, u32 * ring, u32 start, @return - (u32) number of buffers actually allocated, may be less than the number requested or zero */ -always_inline u32 +always_inline __clib_warn_unused_result u32 vlib_buffer_alloc_to_ring_from_pool (vlib_main_t * vm, u32 * ring, u32 start, u32 ring_size, u32 n_buffers, u8 buffer_pool_index) @@ -691,6 +720,7 @@ static_always_inline void vlib_buffer_pool_put (vlib_main_t * vm, u8 buffer_pool_index, u32 * buffers, u32 n_buffers) { + vlib_buffer_main_t *bm = vm->buffer_main; vlib_buffer_pool_t *bp = vlib_get_buffer_pool (vm, buffer_pool_index); vlib_buffer_pool_thread_t *bpt = vec_elt_at_index (bp->threads, vm->thread_index); @@ -699,6 +729,8 @@ vlib_buffer_pool_put (vlib_main_t * vm, u8 buffer_pool_index, if (CLIB_DEBUG > 0) vlib_buffer_validate_alloc_free (vm, buffers, n_buffers, VLIB_BUFFER_KNOWN_ALLOCATED); + if (PREDICT_FALSE (bm->free_callback_fn != 0)) + bm->free_callback_fn (vm, buffer_pool_index, buffers, n_buffers); n_cached = bpt->n_cached; n_empty = VLIB_BUFFER_POOL_PER_THREAD_CACHE_SZ - n_cached; @@ -729,33 +761,79 @@ vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers, vlib_buffer_pool_t *bp = 0; u8 buffer_pool_index = ~0; u32 n_queue = 0, queue[queue_size + 4]; - vlib_buffer_t bt = { }; + vlib_buffer_template_t bt = {}; #if defined(CLIB_HAVE_VEC128) vlib_buffer_t bpi_mask = {.buffer_pool_index = ~0 }; - vlib_buffer_t bpi_vec = {.buffer_pool_index = ~0 }; + vlib_buffer_t bpi_vec = {}; vlib_buffer_t flags_refs_mask = { .flags = VLIB_BUFFER_NEXT_PRESENT, .ref_count = ~1 }; #endif + if (PREDICT_FALSE (n_buffers == 0)) + return; + + vlib_buffer_t *b = vlib_get_buffer (vm, buffers[0]); + buffer_pool_index = b->buffer_pool_index; + bp = vlib_get_buffer_pool (vm, buffer_pool_index); + bt = bp->buffer_template; +#if defined(CLIB_HAVE_VEC128) + bpi_vec.buffer_pool_index = buffer_pool_index; +#endif + while (n_buffers) { vlib_buffer_t *b[8]; u32 bi, sum = 0, flags, next; - if (n_buffers < 12) +#if defined(CLIB_HAVE_VEC512) + if (n_buffers < 8) +#else + if (n_buffers < 4) +#endif goto one_by_one; +#if defined(CLIB_HAVE_VEC512) + vlib_get_buffers (vm, buffers, b, 8); +#else vlib_get_buffers (vm, buffers, b, 4); - vlib_get_buffers (vm, buffers + 8, b + 4, 4); - vlib_prefetch_buffer_header (b[4], LOAD); - vlib_prefetch_buffer_header (b[5], LOAD); - vlib_prefetch_buffer_header (b[6], LOAD); - vlib_prefetch_buffer_header (b[7], LOAD); + if (n_buffers >= 12) + { + vlib_get_buffers (vm, buffers + 8, b + 4, 4); + vlib_prefetch_buffer_header (b[4], LOAD); + vlib_prefetch_buffer_header (b[5], LOAD); + vlib_prefetch_buffer_header (b[6], LOAD); + vlib_prefetch_buffer_header (b[7], LOAD); + } +#endif -#if defined(CLIB_HAVE_VEC128) +#if defined(CLIB_HAVE_VEC512) + u8x16 p0, p1, p2, p3, p4, p5, p6, p7, r; + p0 = u8x16_load_unaligned (b[0]); + p1 = u8x16_load_unaligned (b[1]); + p2 = u8x16_load_unaligned (b[2]); + p3 = u8x16_load_unaligned (b[3]); + p4 = u8x16_load_unaligned (b[4]); + p5 = u8x16_load_unaligned (b[5]); + p6 = u8x16_load_unaligned (b[6]); + p7 = u8x16_load_unaligned (b[7]); + + r = p0 ^ bpi_vec.as_u8x16[0]; + r |= p1 ^ bpi_vec.as_u8x16[0]; + r |= p2 ^ bpi_vec.as_u8x16[0]; + r |= p3 ^ bpi_vec.as_u8x16[0]; + r |= p4 ^ bpi_vec.as_u8x16[0]; + r |= p5 ^ bpi_vec.as_u8x16[0]; + r |= p6 ^ bpi_vec.as_u8x16[0]; + r |= p7 ^ bpi_vec.as_u8x16[0]; + r &= bpi_mask.as_u8x16[0]; + r |= + (p0 | p1 | p2 | p3 | p4 | p5 | p6 | p7) & flags_refs_mask.as_u8x16[0]; + + sum = !u8x16_is_all_zero (r); +#elif defined(CLIB_HAVE_VEC128) u8x16 p0, p1, p2, p3, r; p0 = u8x16_load_unaligned (b[0]); p1 = u8x16_load_unaligned (b[1]); @@ -789,11 +867,41 @@ vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers, if (sum) goto one_by_one; +#if defined(CLIB_HAVE_VEC512) + vlib_buffer_copy_indices (queue + n_queue, buffers, 8); + b[0]->template = bt; + b[1]->template = bt; + b[2]->template = bt; + b[3]->template = bt; + b[4]->template = bt; + b[5]->template = bt; + b[6]->template = bt; + b[7]->template = bt; + n_queue += 8; + + vlib_buffer_validate (vm, b[0]); + vlib_buffer_validate (vm, b[1]); + vlib_buffer_validate (vm, b[2]); + vlib_buffer_validate (vm, b[3]); + vlib_buffer_validate (vm, b[4]); + vlib_buffer_validate (vm, b[5]); + vlib_buffer_validate (vm, b[6]); + vlib_buffer_validate (vm, b[7]); + + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]); + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[1]); + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[2]); + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[3]); + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[4]); + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[5]); + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[6]); + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[7]); +#else vlib_buffer_copy_indices (queue + n_queue, buffers, 4); - vlib_buffer_copy_template (b[0], &bt); - vlib_buffer_copy_template (b[1], &bt); - vlib_buffer_copy_template (b[2], &bt); - vlib_buffer_copy_template (b[3], &bt); + b[0]->template = bt; + b[1]->template = bt; + b[2]->template = bt; + b[3]->template = bt; n_queue += 4; vlib_buffer_validate (vm, b[0]); @@ -805,14 +913,20 @@ vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers, VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[1]); VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[2]); VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[3]); +#endif if (n_queue >= queue_size) { vlib_buffer_pool_put (vm, buffer_pool_index, queue, n_queue); n_queue = 0; } +#if defined(CLIB_HAVE_VEC512) + buffers += 8; + n_buffers -= 8; +#else buffers += 4; n_buffers -= 4; +#endif continue; one_by_one: @@ -837,7 +951,7 @@ vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers, bpi_vec.buffer_pool_index = buffer_pool_index; #endif bp = vlib_get_buffer_pool (vm, buffer_pool_index); - vlib_buffer_copy_template (&bt, &bp->buffer_template); + bt = bp->buffer_template; } vlib_buffer_validate (vm, b[0]); @@ -846,7 +960,7 @@ vlib_buffer_free_inline (vlib_main_t * vm, u32 * buffers, u32 n_buffers, if (clib_atomic_sub_fetch (&b[0]->ref_count, 1) == 0) { - vlib_buffer_copy_template (b[0], &bt); + b[0]->template = bt; queue[n_queue++] = bi; } @@ -1165,11 +1279,11 @@ vlib_buffer_clone_256 (vlib_main_t * vm, u32 src_buffer, u32 * buffers, d->next_buffer = src_buffer; } vlib_buffer_advance (s, head_end_offset); - s->ref_count = n_buffers; + s->ref_count = n_buffers ? n_buffers : s->ref_count; while (s->flags & VLIB_BUFFER_NEXT_PRESENT) { s = vlib_get_buffer (vm, s->next_buffer); - s->ref_count = n_buffers; + s->ref_count = n_buffers ? n_buffers : s->ref_count; } return n_buffers; @@ -1332,7 +1446,7 @@ vlib_buffer_chain_append_data_with_alloc (vlib_main_t * vm, void vlib_buffer_chain_validate (vlib_main_t * vm, vlib_buffer_t * first); format_function_t format_vlib_buffer, format_vlib_buffer_and_data, - format_vlib_buffer_contents; + format_vlib_buffer_contents, format_vlib_buffer_no_chain; typedef struct { @@ -1369,139 +1483,148 @@ vlib_buffer_space_left_at_end (vlib_main_t * vm, vlib_buffer_t * b) ((u8 *) vlib_buffer_get_current (b) + b->current_length); } +#define VLIB_BUFFER_LINEARIZE_MAX 64 + always_inline u32 vlib_buffer_chain_linearize (vlib_main_t * vm, vlib_buffer_t * b) { - vlib_buffer_t *db = b, *sb, *first = b; - int is_cloned = 0; - u32 bytes_left = 0, data_size; - u16 src_left, dst_left, n_buffers = 1; - u8 *dp, *sp; - u32 to_free = 0; + vlib_buffer_t *dst_b; + u32 n_buffers = 1, to_free = 0; + u16 rem_len, dst_len, data_size, src_len = 0; + u8 *dst, *src = 0; if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0)) return 1; + ASSERT (1 == b->ref_count); + if (PREDICT_FALSE (1 != b->ref_count)) + return 0; + data_size = vlib_buffer_get_default_data_size (vm); + rem_len = vlib_buffer_length_in_chain (vm, b) - b->current_length; - dst_left = vlib_buffer_space_left_at_end (vm, b); + dst_b = b; + dst = vlib_buffer_get_tail (dst_b); + dst_len = vlib_buffer_space_left_at_end (vm, dst_b); - while (b->flags & VLIB_BUFFER_NEXT_PRESENT) - { - b = vlib_get_buffer (vm, b->next_buffer); - if (b->ref_count > 1) - is_cloned = 1; - bytes_left += b->current_length; - n_buffers++; - } + b->total_length_not_including_first_buffer -= dst_len; - /* if buffer is cloned, create completely new chain - unless everything fits - * into one buffer */ - if (is_cloned && bytes_left >= dst_left) + while (rem_len > 0) { - u32 len = 0; - u32 space_needed = bytes_left - dst_left; - u32 tail; - - if (vlib_buffer_alloc (vm, &tail, 1) == 0) - return 0; - - ++n_buffers; - len += data_size; - b = vlib_get_buffer (vm, tail); + u16 copy_len; - while (len < space_needed) + while (0 == src_len) { - u32 bi; - if (vlib_buffer_alloc (vm, &bi, 1) == 0) - { - vlib_buffer_free_one (vm, tail); - return 0; - } - b->flags = VLIB_BUFFER_NEXT_PRESENT; - b->next_buffer = bi; - b = vlib_get_buffer (vm, bi); - len += data_size; - n_buffers++; + ASSERT (b->flags & VLIB_BUFFER_NEXT_PRESENT); + if (PREDICT_FALSE (!(b->flags & VLIB_BUFFER_NEXT_PRESENT))) + break; /* malformed chained buffer */ + + b = vlib_get_buffer (vm, b->next_buffer); + src = vlib_buffer_get_current (b); + src_len = b->current_length; } - sb = vlib_get_buffer (vm, first->next_buffer); - to_free = first->next_buffer; - first->next_buffer = tail; - } - else - sb = vlib_get_buffer (vm, first->next_buffer); - src_left = sb->current_length; - sp = vlib_buffer_get_current (sb); - dp = vlib_buffer_get_tail (db); + if (0 == dst_len) + { + ASSERT (dst_b->flags & VLIB_BUFFER_NEXT_PRESENT); + if (PREDICT_FALSE (!(dst_b->flags & VLIB_BUFFER_NEXT_PRESENT))) + break; /* malformed chained buffer */ - while (bytes_left) - { - u16 bytes_to_copy; + vlib_buffer_t *next_dst_b = vlib_get_buffer (vm, dst_b->next_buffer); - if (dst_left == 0) - { - db->current_length = dp - (u8 *) vlib_buffer_get_current (db); - ASSERT (db->flags & VLIB_BUFFER_NEXT_PRESENT); - db = vlib_get_buffer (vm, db->next_buffer); - dst_left = data_size; - if (db->current_data > 0) + if (PREDICT_TRUE (1 == next_dst_b->ref_count)) { - db->current_data = 0; + /* normal case: buffer is not cloned, just use it */ + dst_b = next_dst_b; } else { - dst_left += -db->current_data; + /* cloned buffer, build a new dest chain from there */ + vlib_buffer_t *bufs[VLIB_BUFFER_LINEARIZE_MAX]; + u32 bis[VLIB_BUFFER_LINEARIZE_MAX + 1]; + const int n = (rem_len + data_size - 1) / data_size; + int n_alloc; + int i; + + ASSERT (n <= VLIB_BUFFER_LINEARIZE_MAX); + if (PREDICT_FALSE (n > VLIB_BUFFER_LINEARIZE_MAX)) + return 0; + + n_alloc = vlib_buffer_alloc (vm, bis, n); + if (PREDICT_FALSE (n_alloc != n)) + { + vlib_buffer_free (vm, bis, n_alloc); + return 0; + } + + vlib_get_buffers (vm, bis, bufs, n); + + for (i = 0; i < n - 1; i++) + { + bufs[i]->flags |= VLIB_BUFFER_NEXT_PRESENT; + bufs[i]->next_buffer = bis[i + 1]; + } + + to_free = dst_b->next_buffer; + dst_b->next_buffer = bis[0]; + dst_b = bufs[0]; } - dp = vlib_buffer_get_current (db); - } - while (src_left == 0) - { - ASSERT (sb->flags & VLIB_BUFFER_NEXT_PRESENT); - sb = vlib_get_buffer (vm, sb->next_buffer); - src_left = sb->current_length; - sp = vlib_buffer_get_current (sb); + n_buffers++; + + dst_b->current_data = clib_min (0, dst_b->current_data); + dst_b->current_length = 0; + + dst = dst_b->data + dst_b->current_data; + dst_len = data_size - dst_b->current_data; } - bytes_to_copy = clib_min (dst_left, src_left); + copy_len = clib_min (src_len, dst_len); - if (dp != sp) + if (PREDICT_TRUE (src == dst)) { - if (sb == db) - bytes_to_copy = clib_min (bytes_to_copy, sp - dp); - - clib_memcpy_fast (dp, sp, bytes_to_copy); + /* nothing to do */ + } + else if (src + copy_len > dst && dst + copy_len > src) + { + /* src and dst overlap */ + ASSERT (b == dst_b); + memmove (dst, src, copy_len); + } + else + { + clib_memcpy_fast (dst, src, copy_len); } - src_left -= bytes_to_copy; - dst_left -= bytes_to_copy; - dp += bytes_to_copy; - sp += bytes_to_copy; - bytes_left -= bytes_to_copy; + dst_b->current_length += copy_len; + + dst += copy_len; + src += copy_len; + dst_len -= copy_len; + src_len -= copy_len; + rem_len -= copy_len; } - if (db != first) - db->current_data = 0; - db->current_length = dp - (u8 *) vlib_buffer_get_current (db); - if (is_cloned && to_free) + /* in case of a malformed chain buffer, we'll exit early from the loop. */ + ASSERT (0 == rem_len); + b->total_length_not_including_first_buffer -= rem_len; + + if (to_free) vlib_buffer_free_one (vm, to_free); - else + + if (dst_b->flags & VLIB_BUFFER_NEXT_PRESENT) { - if (db->flags & VLIB_BUFFER_NEXT_PRESENT) - vlib_buffer_free_one (vm, db->next_buffer); - db->flags &= ~VLIB_BUFFER_NEXT_PRESENT; - b = first; - n_buffers = 1; - while (b->flags & VLIB_BUFFER_NEXT_PRESENT) + /* the resulting chain is smaller than the original, cut it there */ + dst_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; + vlib_buffer_free_one (vm, dst_b->next_buffer); + if (1 == n_buffers) { - b = vlib_get_buffer (vm, b->next_buffer); - ++n_buffers; + /* no longer a chained buffer */ + dst_b->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID; + dst_b->total_length_not_including_first_buffer = 0; } } - first->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID; - return n_buffers; }