+struct avf_ip4_psh
+{
+ u32 src;
+ u32 dst;
+ u8 zero;
+ u8 proto;
+ u16 l4len;
+};
+
+struct avf_ip6_psh
+{
+ ip6_address_t src;
+ ip6_address_t dst;
+ u32 l4len;
+ u32 proto;
+};
+
+static_always_inline u64
+avf_tx_prepare_cksum (vlib_buffer_t * b, u8 is_tso)
+{
+ u64 flags = 0;
+ if (!is_tso && !(b->flags & VNET_BUFFER_F_OFFLOAD))
+ return 0;
+
+ u32 oflags = vnet_buffer2 (b)->oflags;
+ u32 is_tcp = is_tso || oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM;
+ u32 is_udp = !is_tso && oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM;
+ u32 is_ip4 = b->flags & VNET_BUFFER_F_IS_IP4;
+ u32 is_ip6 = b->flags & VNET_BUFFER_F_IS_IP6;
+ ASSERT (!is_tcp || !is_udp);
+ ASSERT (is_ip4 || is_ip6);
+ i16 l2_hdr_offset = b->current_data;
+ i16 l3_hdr_offset = vnet_buffer (b)->l3_hdr_offset;
+ i16 l4_hdr_offset = vnet_buffer (b)->l4_hdr_offset;
+ u16 l2_len = l3_hdr_offset - l2_hdr_offset;
+ u16 l3_len = l4_hdr_offset - l3_hdr_offset;
+ ip4_header_t *ip4 = (void *) (b->data + l3_hdr_offset);
+ ip6_header_t *ip6 = (void *) (b->data + l3_hdr_offset);
+ tcp_header_t *tcp = (void *) (b->data + l4_hdr_offset);
+ udp_header_t *udp = (void *) (b->data + l4_hdr_offset);
+ u16 l4_len =
+ is_tcp ? tcp_header_bytes (tcp) : is_udp ? sizeof (udp_header_t) : 0;
+ u16 sum = 0;
+
+ flags |= AVF_TXD_OFFSET_MACLEN (l2_len) |
+ AVF_TXD_OFFSET_IPLEN (l3_len) | AVF_TXD_OFFSET_L4LEN (l4_len);
+ flags |= is_ip4 ? AVF_TXD_CMD_IIPT_IPV4 : AVF_TXD_CMD_IIPT_IPV6;
+ flags |= is_tcp ? AVF_TXD_CMD_L4T_TCP : is_udp ? AVF_TXD_CMD_L4T_UDP : 0;
+
+ if (is_ip4)
+ ip4->checksum = 0;
+
+ if (is_tso)
+ {
+ if (is_ip4)
+ ip4->length = 0;
+ else
+ ip6->payload_length = 0;
+ }
+
+ if (is_tcp || is_udp)
+ {
+ if (is_ip4)
+ {
+ struct avf_ip4_psh psh = { 0 };
+ psh.src = ip4->src_address.as_u32;
+ psh.dst = ip4->dst_address.as_u32;
+ psh.proto = ip4->protocol;
+ psh.l4len =
+ is_tso ? 0 :
+ clib_host_to_net_u16 (clib_net_to_host_u16 (ip4->length) -
+ (l4_hdr_offset - l3_hdr_offset));
+ sum = ~ip_csum (&psh, sizeof (psh));
+ }
+ else
+ {
+ struct avf_ip6_psh psh = { 0 };
+ psh.src = ip6->src_address;
+ psh.dst = ip6->dst_address;
+ psh.proto = clib_host_to_net_u32 ((u32) ip6->protocol);
+ psh.l4len = is_tso ? 0 : ip6->payload_length;
+ sum = ~ip_csum (&psh, sizeof (psh));
+ }
+ }
+ /* ip_csum does a byte swap for some reason... */
+ sum = clib_net_to_host_u16 (sum);
+ if (is_tcp)
+ tcp->checksum = sum;
+ else if (is_udp)
+ udp->checksum = sum;
+ return flags;
+}
+
+static_always_inline u32
+avf_tx_fill_ctx_desc (vlib_main_t *vm, avf_txq_t *txq, avf_tx_desc_t *d,
+ vlib_buffer_t *b)
+{
+ vlib_buffer_t *ctx_ph;
+ u32 *bi = txq->ph_bufs;
+
+next:
+ ctx_ph = vlib_get_buffer (vm, bi[0]);
+ if (PREDICT_FALSE (ctx_ph->ref_count == 255))
+ {
+ bi++;
+ goto next;
+ }
+
+ /* Acquire a reference on the placeholder buffer */
+ ctx_ph->ref_count++;
+
+ u16 l234hdr_sz = vnet_buffer (b)->l4_hdr_offset - b->current_data +
+ vnet_buffer2 (b)->gso_l4_hdr_sz;
+ u16 tlen = vlib_buffer_length_in_chain (vm, b) - l234hdr_sz;
+ d[0].qword[0] = 0;
+ d[0].qword[1] = AVF_TXD_DTYP_CTX | AVF_TXD_CTX_CMD_TSO
+ | AVF_TXD_CTX_SEG_MSS (vnet_buffer2 (b)->gso_size) |
+ AVF_TXD_CTX_SEG_TLEN (tlen);
+ return bi[0];
+}
+
+static_always_inline void
+avf_tx_copy_desc (avf_tx_desc_t *d, avf_tx_desc_t *s, u32 n_descs)
+{
+#if defined CLIB_HAVE_VEC512
+ while (n_descs >= 8)
+ {
+ u64x8u *dv = (u64x8u *) d;
+ u64x8u *sv = (u64x8u *) s;
+
+ dv[0] = sv[0];
+ dv[1] = sv[1];
+
+ /* next */
+ d += 8;
+ s += 8;
+ n_descs -= 8;
+ }
+#elif defined CLIB_HAVE_VEC256
+ while (n_descs >= 4)
+ {
+ u64x4u *dv = (u64x4u *) d;
+ u64x4u *sv = (u64x4u *) s;
+
+ dv[0] = sv[0];
+ dv[1] = sv[1];
+
+ /* next */
+ d += 4;
+ s += 4;
+ n_descs -= 4;
+ }
+#elif defined CLIB_HAVE_VEC128
+ while (n_descs >= 2)
+ {
+ u64x2u *dv = (u64x2u *) d;
+ u64x2u *sv = (u64x2u *) s;
+
+ dv[0] = sv[0];
+ dv[1] = sv[1];
+
+ /* next */
+ d += 2;
+ s += 2;
+ n_descs -= 2;
+ }
+#endif
+ while (n_descs)
+ {
+ d[0].qword[0] = s[0].qword[0];
+ d[0].qword[1] = s[0].qword[1];
+ d++;
+ s++;
+ n_descs--;
+ }
+}
+
+static_always_inline void
+avf_tx_fill_data_desc (vlib_main_t *vm, avf_tx_desc_t *d, vlib_buffer_t *b,
+ u64 cmd, int use_va_dma)
+{
+ if (use_va_dma)
+ d->qword[0] = vlib_buffer_get_current_va (b);
+ else
+ d->qword[0] = vlib_buffer_get_current_pa (vm, b);
+ d->qword[1] = (((u64) b->current_length) << 34 | cmd | AVF_TXD_CMD_RSV);
+}