mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 12:46:49 +07:00
76e21533a4
Fixes an issue where TX Timestamps are not arriving on the error queue
when UDP_SEGMENT CMSG type is combined with CMSG type SO_TIMESTAMPING.
This can be illustrated with an updated updgso_bench_tx program which
includes the '-T' option to test for this condition. It also introduces
the '-P' option which will call poll() before reading the error queue.
./udpgso_bench_tx -4ucTPv -S 1472 -l2 -D 172.16.120.18
poll timeout
udp tx: 0 MB/s 1 calls/s 1 msg/s
The "poll timeout" message above indicates that TX timestamp never
arrived.
This patch preserves tx_flags for the first UDP GSO segment. Only the
first segment is timestamped, even though in some cases there may be
benefital in timestamping both the first and last segment.
Factors in deciding on first segment timestamp only:
- Timestamping both first and last segmented is not feasible. Hardware
can only have one outstanding TS request at a time.
- Timestamping last segment may under report network latency of the
previous segments. Even though the doorbell is suppressed, the ring
producer counter has been incremented.
- Timestamping the first segment has the upside in that it reports
timestamps from the application's view, e.g. RTT.
- Timestamping the first segment has the downside that it may
underreport tx host network latency. It appears that we have to pick
one or the other. And possibly follow-up with a config flag to choose
behavior.
v2: Remove tests as noted by Willem de Bruijn <willemb@google.com>
Moving tests from net to net-next
v3: Update only relevant tx_flag bits as per
Willem de Bruijn <willemb@google.com>
v4: Update comments and commit message as per
Willem de Bruijn <willemb@google.com>
Fixes: ee80d1ebe5
("udp: add udp gso")
Signed-off-by: Fred Klassen <fklassen@appneta.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
566 lines
15 KiB
C
566 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* IPV4 GSO/GRO offload support
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* Linux INET implementation
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*
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* UDPv4 GSO support
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*/
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#include <linux/skbuff.h>
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#include <net/udp.h>
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#include <net/protocol.h>
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#include <net/inet_common.h>
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static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb,
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netdev_features_t features,
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struct sk_buff *(*gso_inner_segment)(struct sk_buff *skb,
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netdev_features_t features),
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__be16 new_protocol, bool is_ipv6)
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{
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int tnl_hlen = skb_inner_mac_header(skb) - skb_transport_header(skb);
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bool remcsum, need_csum, offload_csum, gso_partial;
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struct sk_buff *segs = ERR_PTR(-EINVAL);
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struct udphdr *uh = udp_hdr(skb);
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u16 mac_offset = skb->mac_header;
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__be16 protocol = skb->protocol;
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u16 mac_len = skb->mac_len;
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int udp_offset, outer_hlen;
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__wsum partial;
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bool need_ipsec;
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if (unlikely(!pskb_may_pull(skb, tnl_hlen)))
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goto out;
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/* Adjust partial header checksum to negate old length.
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* We cannot rely on the value contained in uh->len as it is
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* possible that the actual value exceeds the boundaries of the
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* 16 bit length field due to the header being added outside of an
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* IP or IPv6 frame that was already limited to 64K - 1.
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*/
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if (skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL)
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partial = (__force __wsum)uh->len;
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else
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partial = (__force __wsum)htonl(skb->len);
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partial = csum_sub(csum_unfold(uh->check), partial);
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/* setup inner skb. */
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skb->encapsulation = 0;
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SKB_GSO_CB(skb)->encap_level = 0;
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__skb_pull(skb, tnl_hlen);
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skb_reset_mac_header(skb);
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skb_set_network_header(skb, skb_inner_network_offset(skb));
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skb->mac_len = skb_inner_network_offset(skb);
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skb->protocol = new_protocol;
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need_csum = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM);
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skb->encap_hdr_csum = need_csum;
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remcsum = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TUNNEL_REMCSUM);
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skb->remcsum_offload = remcsum;
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need_ipsec = skb_dst(skb) && dst_xfrm(skb_dst(skb));
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/* Try to offload checksum if possible */
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offload_csum = !!(need_csum &&
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!need_ipsec &&
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(skb->dev->features &
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(is_ipv6 ? (NETIF_F_HW_CSUM | NETIF_F_IPV6_CSUM) :
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(NETIF_F_HW_CSUM | NETIF_F_IP_CSUM))));
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features &= skb->dev->hw_enc_features;
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/* The only checksum offload we care about from here on out is the
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* outer one so strip the existing checksum feature flags and
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* instead set the flag based on our outer checksum offload value.
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*/
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if (remcsum) {
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features &= ~NETIF_F_CSUM_MASK;
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if (!need_csum || offload_csum)
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features |= NETIF_F_HW_CSUM;
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}
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/* segment inner packet. */
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segs = gso_inner_segment(skb, features);
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if (IS_ERR_OR_NULL(segs)) {
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skb_gso_error_unwind(skb, protocol, tnl_hlen, mac_offset,
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mac_len);
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goto out;
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}
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gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
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outer_hlen = skb_tnl_header_len(skb);
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udp_offset = outer_hlen - tnl_hlen;
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skb = segs;
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do {
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unsigned int len;
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if (remcsum)
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skb->ip_summed = CHECKSUM_NONE;
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/* Set up inner headers if we are offloading inner checksum */
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if (skb->ip_summed == CHECKSUM_PARTIAL) {
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skb_reset_inner_headers(skb);
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skb->encapsulation = 1;
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}
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skb->mac_len = mac_len;
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skb->protocol = protocol;
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__skb_push(skb, outer_hlen);
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skb_reset_mac_header(skb);
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skb_set_network_header(skb, mac_len);
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skb_set_transport_header(skb, udp_offset);
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len = skb->len - udp_offset;
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uh = udp_hdr(skb);
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/* If we are only performing partial GSO the inner header
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* will be using a length value equal to only one MSS sized
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* segment instead of the entire frame.
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*/
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if (gso_partial && skb_is_gso(skb)) {
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uh->len = htons(skb_shinfo(skb)->gso_size +
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SKB_GSO_CB(skb)->data_offset +
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skb->head - (unsigned char *)uh);
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} else {
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uh->len = htons(len);
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}
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if (!need_csum)
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continue;
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uh->check = ~csum_fold(csum_add(partial,
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(__force __wsum)htonl(len)));
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if (skb->encapsulation || !offload_csum) {
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uh->check = gso_make_checksum(skb, ~uh->check);
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if (uh->check == 0)
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uh->check = CSUM_MANGLED_0;
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} else {
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skb->ip_summed = CHECKSUM_PARTIAL;
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skb->csum_start = skb_transport_header(skb) - skb->head;
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skb->csum_offset = offsetof(struct udphdr, check);
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}
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} while ((skb = skb->next));
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out:
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return segs;
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}
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struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
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netdev_features_t features,
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bool is_ipv6)
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{
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__be16 protocol = skb->protocol;
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const struct net_offload **offloads;
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const struct net_offload *ops;
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struct sk_buff *segs = ERR_PTR(-EINVAL);
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struct sk_buff *(*gso_inner_segment)(struct sk_buff *skb,
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netdev_features_t features);
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rcu_read_lock();
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switch (skb->inner_protocol_type) {
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case ENCAP_TYPE_ETHER:
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protocol = skb->inner_protocol;
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gso_inner_segment = skb_mac_gso_segment;
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break;
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case ENCAP_TYPE_IPPROTO:
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offloads = is_ipv6 ? inet6_offloads : inet_offloads;
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ops = rcu_dereference(offloads[skb->inner_ipproto]);
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if (!ops || !ops->callbacks.gso_segment)
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goto out_unlock;
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gso_inner_segment = ops->callbacks.gso_segment;
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break;
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default:
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goto out_unlock;
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}
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segs = __skb_udp_tunnel_segment(skb, features, gso_inner_segment,
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protocol, is_ipv6);
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out_unlock:
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rcu_read_unlock();
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return segs;
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}
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EXPORT_SYMBOL(skb_udp_tunnel_segment);
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struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb,
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netdev_features_t features)
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{
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struct sock *sk = gso_skb->sk;
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unsigned int sum_truesize = 0;
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struct sk_buff *segs, *seg;
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struct udphdr *uh;
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unsigned int mss;
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bool copy_dtor;
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__sum16 check;
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__be16 newlen;
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mss = skb_shinfo(gso_skb)->gso_size;
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if (gso_skb->len <= sizeof(*uh) + mss)
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return ERR_PTR(-EINVAL);
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skb_pull(gso_skb, sizeof(*uh));
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/* clear destructor to avoid skb_segment assigning it to tail */
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copy_dtor = gso_skb->destructor == sock_wfree;
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if (copy_dtor)
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gso_skb->destructor = NULL;
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segs = skb_segment(gso_skb, features);
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if (unlikely(IS_ERR_OR_NULL(segs))) {
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if (copy_dtor)
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gso_skb->destructor = sock_wfree;
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return segs;
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}
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/* GSO partial and frag_list segmentation only requires splitting
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* the frame into an MSS multiple and possibly a remainder, both
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* cases return a GSO skb. So update the mss now.
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*/
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if (skb_is_gso(segs))
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mss *= skb_shinfo(segs)->gso_segs;
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seg = segs;
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uh = udp_hdr(seg);
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/* preserve TX timestamp flags and TS key for first segment */
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skb_shinfo(seg)->tskey = skb_shinfo(gso_skb)->tskey;
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skb_shinfo(seg)->tx_flags |=
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(skb_shinfo(gso_skb)->tx_flags & SKBTX_ANY_TSTAMP);
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/* compute checksum adjustment based on old length versus new */
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newlen = htons(sizeof(*uh) + mss);
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check = csum16_add(csum16_sub(uh->check, uh->len), newlen);
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for (;;) {
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if (copy_dtor) {
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seg->destructor = sock_wfree;
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seg->sk = sk;
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sum_truesize += seg->truesize;
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}
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if (!seg->next)
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break;
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uh->len = newlen;
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uh->check = check;
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if (seg->ip_summed == CHECKSUM_PARTIAL)
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gso_reset_checksum(seg, ~check);
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else
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uh->check = gso_make_checksum(seg, ~check) ? :
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CSUM_MANGLED_0;
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seg = seg->next;
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uh = udp_hdr(seg);
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}
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/* last packet can be partial gso_size, account for that in checksum */
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newlen = htons(skb_tail_pointer(seg) - skb_transport_header(seg) +
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seg->data_len);
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check = csum16_add(csum16_sub(uh->check, uh->len), newlen);
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uh->len = newlen;
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uh->check = check;
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if (seg->ip_summed == CHECKSUM_PARTIAL)
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gso_reset_checksum(seg, ~check);
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else
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uh->check = gso_make_checksum(seg, ~check) ? : CSUM_MANGLED_0;
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/* update refcount for the packet */
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if (copy_dtor) {
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int delta = sum_truesize - gso_skb->truesize;
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/* In some pathological cases, delta can be negative.
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* We need to either use refcount_add() or refcount_sub_and_test()
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*/
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if (likely(delta >= 0))
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refcount_add(delta, &sk->sk_wmem_alloc);
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else
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WARN_ON_ONCE(refcount_sub_and_test(-delta, &sk->sk_wmem_alloc));
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}
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return segs;
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}
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EXPORT_SYMBOL_GPL(__udp_gso_segment);
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static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
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netdev_features_t features)
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{
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struct sk_buff *segs = ERR_PTR(-EINVAL);
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unsigned int mss;
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__wsum csum;
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struct udphdr *uh;
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struct iphdr *iph;
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|
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if (skb->encapsulation &&
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(skb_shinfo(skb)->gso_type &
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(SKB_GSO_UDP_TUNNEL|SKB_GSO_UDP_TUNNEL_CSUM))) {
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segs = skb_udp_tunnel_segment(skb, features, false);
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goto out;
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}
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if (!(skb_shinfo(skb)->gso_type & (SKB_GSO_UDP | SKB_GSO_UDP_L4)))
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goto out;
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if (!pskb_may_pull(skb, sizeof(struct udphdr)))
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goto out;
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if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
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return __udp_gso_segment(skb, features);
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mss = skb_shinfo(skb)->gso_size;
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if (unlikely(skb->len <= mss))
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goto out;
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/* Do software UFO. Complete and fill in the UDP checksum as
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* HW cannot do checksum of UDP packets sent as multiple
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* IP fragments.
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*/
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uh = udp_hdr(skb);
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iph = ip_hdr(skb);
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uh->check = 0;
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csum = skb_checksum(skb, 0, skb->len, 0);
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uh->check = udp_v4_check(skb->len, iph->saddr, iph->daddr, csum);
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if (uh->check == 0)
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uh->check = CSUM_MANGLED_0;
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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|
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/* If there is no outer header we can fake a checksum offload
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* due to the fact that we have already done the checksum in
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* software prior to segmenting the frame.
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*/
|
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if (!skb->encap_hdr_csum)
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features |= NETIF_F_HW_CSUM;
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|
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/* Fragment the skb. IP headers of the fragments are updated in
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* inet_gso_segment()
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*/
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segs = skb_segment(skb, features);
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out:
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return segs;
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}
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#define UDP_GRO_CNT_MAX 64
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static struct sk_buff *udp_gro_receive_segment(struct list_head *head,
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struct sk_buff *skb)
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{
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struct udphdr *uh = udp_hdr(skb);
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struct sk_buff *pp = NULL;
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struct udphdr *uh2;
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struct sk_buff *p;
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unsigned int ulen;
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|
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/* requires non zero csum, for symmetry with GSO */
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if (!uh->check) {
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NAPI_GRO_CB(skb)->flush = 1;
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return NULL;
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}
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|
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/* Do not deal with padded or malicious packets, sorry ! */
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ulen = ntohs(uh->len);
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if (ulen <= sizeof(*uh) || ulen != skb_gro_len(skb)) {
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NAPI_GRO_CB(skb)->flush = 1;
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return NULL;
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}
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/* pull encapsulating udp header */
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skb_gro_pull(skb, sizeof(struct udphdr));
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skb_gro_postpull_rcsum(skb, uh, sizeof(struct udphdr));
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list_for_each_entry(p, head, list) {
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if (!NAPI_GRO_CB(p)->same_flow)
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continue;
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uh2 = udp_hdr(p);
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|
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/* Match ports only, as csum is always non zero */
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if ((*(u32 *)&uh->source != *(u32 *)&uh2->source)) {
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NAPI_GRO_CB(p)->same_flow = 0;
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continue;
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}
|
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|
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/* Terminate the flow on len mismatch or if it grow "too much".
|
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* Under small packet flood GRO count could elsewhere grow a lot
|
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* leading to excessive truesize values.
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* On len mismatch merge the first packet shorter than gso_size,
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* otherwise complete the GRO packet.
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*/
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if (ulen > ntohs(uh2->len) || skb_gro_receive(p, skb) ||
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ulen != ntohs(uh2->len) ||
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NAPI_GRO_CB(p)->count >= UDP_GRO_CNT_MAX)
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pp = p;
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|
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return pp;
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}
|
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|
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/* mismatch, but we never need to flush */
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return NULL;
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}
|
|
|
|
INDIRECT_CALLABLE_DECLARE(struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
|
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__be16 sport, __be16 dport));
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struct sk_buff *udp_gro_receive(struct list_head *head, struct sk_buff *skb,
|
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struct udphdr *uh, udp_lookup_t lookup)
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{
|
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struct sk_buff *pp = NULL;
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struct sk_buff *p;
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struct udphdr *uh2;
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unsigned int off = skb_gro_offset(skb);
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int flush = 1;
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struct sock *sk;
|
|
|
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rcu_read_lock();
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sk = INDIRECT_CALL_INET(lookup, udp6_lib_lookup_skb,
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udp4_lib_lookup_skb, skb, uh->source, uh->dest);
|
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if (!sk)
|
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goto out_unlock;
|
|
|
|
if (udp_sk(sk)->gro_enabled) {
|
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pp = call_gro_receive(udp_gro_receive_segment, head, skb);
|
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rcu_read_unlock();
|
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return pp;
|
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}
|
|
|
|
if (NAPI_GRO_CB(skb)->encap_mark ||
|
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(skb->ip_summed != CHECKSUM_PARTIAL &&
|
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NAPI_GRO_CB(skb)->csum_cnt == 0 &&
|
|
!NAPI_GRO_CB(skb)->csum_valid) ||
|
|
!udp_sk(sk)->gro_receive)
|
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goto out_unlock;
|
|
|
|
/* mark that this skb passed once through the tunnel gro layer */
|
|
NAPI_GRO_CB(skb)->encap_mark = 1;
|
|
|
|
flush = 0;
|
|
|
|
list_for_each_entry(p, head, list) {
|
|
if (!NAPI_GRO_CB(p)->same_flow)
|
|
continue;
|
|
|
|
uh2 = (struct udphdr *)(p->data + off);
|
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|
|
/* Match ports and either checksums are either both zero
|
|
* or nonzero.
|
|
*/
|
|
if ((*(u32 *)&uh->source != *(u32 *)&uh2->source) ||
|
|
(!uh->check ^ !uh2->check)) {
|
|
NAPI_GRO_CB(p)->same_flow = 0;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
skb_gro_pull(skb, sizeof(struct udphdr)); /* pull encapsulating udp header */
|
|
skb_gro_postpull_rcsum(skb, uh, sizeof(struct udphdr));
|
|
pp = call_gro_receive_sk(udp_sk(sk)->gro_receive, sk, head, skb);
|
|
|
|
out_unlock:
|
|
rcu_read_unlock();
|
|
skb_gro_flush_final(skb, pp, flush);
|
|
return pp;
|
|
}
|
|
EXPORT_SYMBOL(udp_gro_receive);
|
|
|
|
INDIRECT_CALLABLE_SCOPE
|
|
struct sk_buff *udp4_gro_receive(struct list_head *head, struct sk_buff *skb)
|
|
{
|
|
struct udphdr *uh = udp_gro_udphdr(skb);
|
|
|
|
if (unlikely(!uh) || !static_branch_unlikely(&udp_encap_needed_key))
|
|
goto flush;
|
|
|
|
/* Don't bother verifying checksum if we're going to flush anyway. */
|
|
if (NAPI_GRO_CB(skb)->flush)
|
|
goto skip;
|
|
|
|
if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check,
|
|
inet_gro_compute_pseudo))
|
|
goto flush;
|
|
else if (uh->check)
|
|
skb_gro_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
|
|
inet_gro_compute_pseudo);
|
|
skip:
|
|
NAPI_GRO_CB(skb)->is_ipv6 = 0;
|
|
return udp_gro_receive(head, skb, uh, udp4_lib_lookup_skb);
|
|
|
|
flush:
|
|
NAPI_GRO_CB(skb)->flush = 1;
|
|
return NULL;
|
|
}
|
|
|
|
static int udp_gro_complete_segment(struct sk_buff *skb)
|
|
{
|
|
struct udphdr *uh = udp_hdr(skb);
|
|
|
|
skb->csum_start = (unsigned char *)uh - skb->head;
|
|
skb->csum_offset = offsetof(struct udphdr, check);
|
|
skb->ip_summed = CHECKSUM_PARTIAL;
|
|
|
|
skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
|
|
skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_L4;
|
|
return 0;
|
|
}
|
|
|
|
int udp_gro_complete(struct sk_buff *skb, int nhoff,
|
|
udp_lookup_t lookup)
|
|
{
|
|
__be16 newlen = htons(skb->len - nhoff);
|
|
struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
|
|
int err = -ENOSYS;
|
|
struct sock *sk;
|
|
|
|
uh->len = newlen;
|
|
|
|
rcu_read_lock();
|
|
sk = INDIRECT_CALL_INET(lookup, udp6_lib_lookup_skb,
|
|
udp4_lib_lookup_skb, skb, uh->source, uh->dest);
|
|
if (sk && udp_sk(sk)->gro_enabled) {
|
|
err = udp_gro_complete_segment(skb);
|
|
} else if (sk && udp_sk(sk)->gro_complete) {
|
|
skb_shinfo(skb)->gso_type = uh->check ? SKB_GSO_UDP_TUNNEL_CSUM
|
|
: SKB_GSO_UDP_TUNNEL;
|
|
|
|
/* Set encapsulation before calling into inner gro_complete()
|
|
* functions to make them set up the inner offsets.
|
|
*/
|
|
skb->encapsulation = 1;
|
|
err = udp_sk(sk)->gro_complete(sk, skb,
|
|
nhoff + sizeof(struct udphdr));
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (skb->remcsum_offload)
|
|
skb_shinfo(skb)->gso_type |= SKB_GSO_TUNNEL_REMCSUM;
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(udp_gro_complete);
|
|
|
|
INDIRECT_CALLABLE_SCOPE int udp4_gro_complete(struct sk_buff *skb, int nhoff)
|
|
{
|
|
const struct iphdr *iph = ip_hdr(skb);
|
|
struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
|
|
|
|
if (uh->check)
|
|
uh->check = ~udp_v4_check(skb->len - nhoff, iph->saddr,
|
|
iph->daddr, 0);
|
|
|
|
return udp_gro_complete(skb, nhoff, udp4_lib_lookup_skb);
|
|
}
|
|
|
|
static const struct net_offload udpv4_offload = {
|
|
.callbacks = {
|
|
.gso_segment = udp4_ufo_fragment,
|
|
.gro_receive = udp4_gro_receive,
|
|
.gro_complete = udp4_gro_complete,
|
|
},
|
|
};
|
|
|
|
int __init udpv4_offload_init(void)
|
|
{
|
|
return inet_add_offload(&udpv4_offload, IPPROTO_UDP);
|
|
}
|