[dpdk-dev] [PATCH v6 06/10] ipsec: add transmit segmentation offload support
Ananyev, Konstantin
konstantin.ananyev at intel.com
Thu Sep 23 16:09:23 CEST 2021
> Add support for transmit segmentation offload to inline crypto processing
> mode. This offload is not supported by other offload modes, as at a
> minimum it requires inline crypto for IPsec to be supported on the
> network interface.
>
> Signed-off-by: Declan Doherty <declan.doherty at intel.com>
> Signed-off-by: Radu Nicolau <radu.nicolau at intel.com>
> Signed-off-by: Abhijit Sinha <abhijit.sinha at intel.com>
> Signed-off-by: Daniel Martin Buckley <daniel.m.buckley at intel.com>
> Acked-by: Fan Zhang <roy.fan.zhang at intel.com>
> ---
> lib/ipsec/esp_inb.c | 4 +-
> lib/ipsec/esp_outb.c | 115 +++++++++++++++++++++++++++++++++++--------
> lib/ipsec/iph.h | 10 +++-
> lib/ipsec/sa.c | 6 +++
> lib/ipsec/sa.h | 4 ++
> 5 files changed, 114 insertions(+), 25 deletions(-)
>
> diff --git a/lib/ipsec/esp_inb.c b/lib/ipsec/esp_inb.c
> index d66c88f05d..a6ab8fbdd5 100644
> --- a/lib/ipsec/esp_inb.c
> +++ b/lib/ipsec/esp_inb.c
> @@ -668,8 +668,8 @@ trs_process(const struct rte_ipsec_sa *sa, struct rte_mbuf *mb[],
> /* modify packet's layout */
> np = trs_process_step2(mb[i], ml[i], hl[i], cofs,
> to[i], tl, sqn + k);
> - update_trs_l3hdr(sa, np + l2, mb[i]->pkt_len,
> - l2, hl[i] - l2, espt[i].next_proto);
> + update_trs_l34hdrs(sa, np + l2, mb[i]->pkt_len,
> + l2, hl[i] - l2, espt[i].next_proto, 0);
>
> /* update mbuf's metadata */
> trs_process_step3(mb[i]);
> diff --git a/lib/ipsec/esp_outb.c b/lib/ipsec/esp_outb.c
> index a3f77469c3..9fc7075796 100644
> --- a/lib/ipsec/esp_outb.c
> +++ b/lib/ipsec/esp_outb.c
> @@ -2,6 +2,8 @@
> * Copyright(c) 2018-2020 Intel Corporation
> */
>
> +#include <math.h>
> +
> #include <rte_ipsec.h>
> #include <rte_esp.h>
> #include <rte_ip.h>
> @@ -156,11 +158,20 @@ outb_tun_pkt_prepare(struct rte_ipsec_sa *sa, rte_be64_t sqc,
>
> /* number of bytes to encrypt */
> clen = plen + sizeof(*espt);
> - clen = RTE_ALIGN_CEIL(clen, sa->pad_align);
> +
> + /* We don't need to pad/ailgn packet when using TSO offload */
> + if (likely(!(mb->ol_flags & (PKT_TX_TCP_SEG | PKT_TX_UDP_SEG))))
> + clen = RTE_ALIGN_CEIL(clen, sa->pad_align);
> +
Here and everywhere:
It doesn't look nice that we have to pollute generic functions with
checking TSO specific flags all over the place.
Can we probably have a specific prepare/process function for inline+tso case?
As we do have for cpu and inline cases right now.
Or just update inline version?
>
> /* pad length + esp tail */
> pdlen = clen - plen;
> - tlen = pdlen + sa->icv_len + sqh_len;
> +
> + /* We don't append ICV length when using TSO offload */
> + if (likely(!(mb->ol_flags & (PKT_TX_TCP_SEG | PKT_TX_UDP_SEG))))
> + tlen = pdlen + sa->icv_len + sqh_len;
> + else
> + tlen = pdlen + sqh_len;
>
> /* do append and prepend */
> ml = rte_pktmbuf_lastseg(mb);
> @@ -337,6 +348,7 @@ outb_trs_pkt_prepare(struct rte_ipsec_sa *sa, rte_be64_t sqc,
> char *ph, *pt;
> uint64_t *iv;
> uint32_t l2len, l3len;
> + uint8_t tso = mb->ol_flags & (PKT_TX_TCP_SEG | PKT_TX_UDP_SEG) ? 1 : 0;
>
> l2len = mb->l2_len;
> l3len = mb->l3_len;
> @@ -349,11 +361,19 @@ outb_trs_pkt_prepare(struct rte_ipsec_sa *sa, rte_be64_t sqc,
>
> /* number of bytes to encrypt */
> clen = plen + sizeof(*espt);
> - clen = RTE_ALIGN_CEIL(clen, sa->pad_align);
> +
> + /* We don't need to pad/ailgn packet when using TSO offload */
> + if (likely(!tso))
> + clen = RTE_ALIGN_CEIL(clen, sa->pad_align);
>
> /* pad length + esp tail */
> pdlen = clen - plen;
> - tlen = pdlen + sa->icv_len + sqh_len;
> +
> + /* We don't append ICV length when using TSO offload */
> + if (likely(!tso))
> + tlen = pdlen + sa->icv_len + sqh_len;
> + else
> + tlen = pdlen + sqh_len;
>
> /* do append and insert */
> ml = rte_pktmbuf_lastseg(mb);
> @@ -375,8 +395,8 @@ outb_trs_pkt_prepare(struct rte_ipsec_sa *sa, rte_be64_t sqc,
> insert_esph(ph, ph + hlen, uhlen);
>
> /* update ip header fields */
> - np = update_trs_l3hdr(sa, ph + l2len, mb->pkt_len - sqh_len, l2len,
> - l3len, IPPROTO_ESP);
> + np = update_trs_l34hdrs(sa, ph + l2len, mb->pkt_len - sqh_len, l2len,
> + l3len, IPPROTO_ESP, tso);
>
> /* update spi, seqn and iv */
> esph = (struct rte_esp_hdr *)(ph + uhlen);
> @@ -651,6 +671,33 @@ inline_outb_mbuf_prepare(const struct rte_ipsec_session *ss,
> }
> }
>
> +/* check if packet will exceed MSS and segmentation is required */
> +static inline int
> +esn_outb_nb_segments(const struct rte_ipsec_sa *sa, struct rte_mbuf *m) {
> + uint16_t segments = 1;
> + uint16_t pkt_l3len = m->pkt_len - m->l2_len;
> +
> + /* Only support segmentation for UDP/TCP flows */
> + if (!(m->packet_type & (RTE_PTYPE_L4_UDP | RTE_PTYPE_L4_TCP)))
> + return segments;
> +
> + if (sa->tso.enabled && pkt_l3len > sa->tso.mss) {
> + segments = ceil((float)pkt_l3len / sa->tso.mss);
Float calculations in the middle of data-path?
Just to calculate roundup?
Doesn't look good to me at all.
> +
> + if (m->packet_type & RTE_PTYPE_L4_TCP) {
> + m->ol_flags |= (PKT_TX_TCP_SEG | PKT_TX_TCP_CKSUM);
That's really strange - why ipsec library will set PKT_TX_TCP_SEG unconditionally?
That should be responsibility of the upper layer, I think.
In the lib we should only check was tso requested for that packet or not.
Same for UDP.
> + m->l4_len = sizeof(struct rte_tcp_hdr);
Hmm, how do we know there are no TCP options present for that packet?
Wouldn't it be better to expect user to provide proper l4_len for such packets?
> + } else {
> + m->ol_flags |= (PKT_TX_UDP_SEG | PKT_TX_UDP_CKSUM);
> + m->l4_len = sizeof(struct rte_udp_hdr);
> + }
> +
> + m->tso_segsz = sa->tso.mss;
> + }
> +
> + return segments;
> +}
> +
> /*
> * process group of ESP outbound tunnel packets destined for
> * INLINE_CRYPTO type of device.
> @@ -660,24 +707,29 @@ inline_outb_tun_pkt_process(const struct rte_ipsec_session *ss,
> struct rte_mbuf *mb[], uint16_t num)
> {
> int32_t rc;
> - uint32_t i, k, n;
> + uint32_t i, k, nb_sqn = 0, nb_sqn_alloc;
> uint64_t sqn;
> rte_be64_t sqc;
> struct rte_ipsec_sa *sa;
> union sym_op_data icv;
> uint64_t iv[IPSEC_MAX_IV_QWORD];
> uint32_t dr[num];
> + uint16_t nb_segs[num];
>
> sa = ss->sa;
>
> - n = num;
> - sqn = esn_outb_update_sqn(sa, &n);
> - if (n != num)
> + for (i = 0; i != num; i++) {
> + nb_segs[i] = esn_outb_nb_segments(sa, mb[i]);
> + nb_sqn += nb_segs[i];
> + }
> +
> + nb_sqn_alloc = nb_sqn;
> + sqn = esn_outb_update_sqn(sa, &nb_sqn_alloc);
> + if (nb_sqn_alloc != nb_sqn)
> rte_errno = EOVERFLOW;
>
> k = 0;
> - for (i = 0; i != n; i++) {
> -
> + for (i = 0; i != num; i++) {
> sqc = rte_cpu_to_be_64(sqn + i);
> gen_iv(iv, sqc);
>
> @@ -691,11 +743,18 @@ inline_outb_tun_pkt_process(const struct rte_ipsec_session *ss,
> dr[i - k] = i;
> rte_errno = -rc;
> }
> +
> + /**
> + * If packet is using tso, increment sqn by the number of
> + * segments for packet
> + */
> + if (mb[i]->ol_flags & (PKT_TX_TCP_SEG | PKT_TX_UDP_SEG))
> + sqn += nb_segs[i] - 1;
> }
>
> /* copy not processed mbufs beyond good ones */
> - if (k != n && k != 0)
> - move_bad_mbufs(mb, dr, n, n - k);
> + if (k != num && k != 0)
> + move_bad_mbufs(mb, dr, num, num - k);
>
> inline_outb_mbuf_prepare(ss, mb, k);
> return k;
> @@ -710,23 +769,30 @@ inline_outb_trs_pkt_process(const struct rte_ipsec_session *ss,
> struct rte_mbuf *mb[], uint16_t num)
> {
> int32_t rc;
> - uint32_t i, k, n;
> + uint32_t i, k, nb_sqn, nb_sqn_alloc;
> uint64_t sqn;
> rte_be64_t sqc;
> struct rte_ipsec_sa *sa;
> union sym_op_data icv;
> uint64_t iv[IPSEC_MAX_IV_QWORD];
> uint32_t dr[num];
> + uint16_t nb_segs[num];
>
> sa = ss->sa;
>
> - n = num;
> - sqn = esn_outb_update_sqn(sa, &n);
> - if (n != num)
> + /* Calculate number of sequence numbers required */
> + for (i = 0, nb_sqn = 0; i != num; i++) {
> + nb_segs[i] = esn_outb_nb_segments(sa, mb[i]);
> + nb_sqn += nb_segs[i];
> + }
> +
> + nb_sqn_alloc = nb_sqn;
> + sqn = esn_outb_update_sqn(sa, &nb_sqn_alloc);
> + if (nb_sqn_alloc != nb_sqn)
> rte_errno = EOVERFLOW;
>
> k = 0;
> - for (i = 0; i != n; i++) {
> + for (i = 0; i != num; i++) {
>
> sqc = rte_cpu_to_be_64(sqn + i);
> gen_iv(iv, sqc);
> @@ -741,11 +807,18 @@ inline_outb_trs_pkt_process(const struct rte_ipsec_session *ss,
> dr[i - k] = i;
> rte_errno = -rc;
> }
> +
> + /**
> + * If packet is using tso, increment sqn by the number of
> + * segments for packet
> + */
> + if (mb[i]->ol_flags & (PKT_TX_TCP_SEG | PKT_TX_UDP_SEG))
> + sqn += nb_segs[i] - 1;
> }
>
> /* copy not processed mbufs beyond good ones */
> - if (k != n && k != 0)
> - move_bad_mbufs(mb, dr, n, n - k);
> + if (k != num && k != 0)
> + move_bad_mbufs(mb, dr, num, num - k);
>
> inline_outb_mbuf_prepare(ss, mb, k);
> return k;
> diff --git a/lib/ipsec/iph.h b/lib/ipsec/iph.h
> index 861f16905a..2d223199ac 100644
> --- a/lib/ipsec/iph.h
> +++ b/lib/ipsec/iph.h
> @@ -6,6 +6,8 @@
> #define _IPH_H_
>
> #include <rte_ip.h>
> +#include <rte_udp.h>
> +#include <rte_tcp.h>
>
> /**
> * @file iph.h
> @@ -39,8 +41,8 @@ insert_esph(char *np, char *op, uint32_t hlen)
>
> /* update original ip header fields for transport case */
> static inline int
> -update_trs_l3hdr(const struct rte_ipsec_sa *sa, void *p, uint32_t plen,
> - uint32_t l2len, uint32_t l3len, uint8_t proto)
> +update_trs_l34hdrs(const struct rte_ipsec_sa *sa, void *p, uint32_t plen,
> + uint32_t l2len, uint32_t l3len, uint8_t proto, uint8_t tso)
Hmm... why to change name of the function?
> {
> int32_t rc;
>
> @@ -51,6 +53,10 @@ update_trs_l3hdr(const struct rte_ipsec_sa *sa, void *p, uint32_t plen,
> v4h = p;
> rc = v4h->next_proto_id;
> v4h->next_proto_id = proto;
> + if (tso) {
> + v4h->hdr_checksum = 0;
> + v4h->total_length = 0;
total_len will be overwritten unconditionally at next line below.
Another question - why it is necessary?
Is it HW specific requirment or ... ?
> + }
> v4h->total_length = rte_cpu_to_be_16(plen - l2len);
> /* IPv6 */
> } else {
> diff --git a/lib/ipsec/sa.c b/lib/ipsec/sa.c
> index 720e0f365b..2ecbbce0a4 100644
> --- a/lib/ipsec/sa.c
> +++ b/lib/ipsec/sa.c
> @@ -565,6 +565,12 @@ rte_ipsec_sa_init(struct rte_ipsec_sa *sa, const struct rte_ipsec_sa_prm *prm,
> sa->type = type;
> sa->size = sz;
>
> +
> + if (prm->ipsec_xform.options.tso == 1) {
> + sa->tso.enabled = 1;
> + sa->tso.mss = prm->ipsec_xform.mss;
> + }
> +
> /* check for ESN flag */
> sa->sqn_mask = (prm->ipsec_xform.options.esn == 0) ?
> UINT32_MAX : UINT64_MAX;
> diff --git a/lib/ipsec/sa.h b/lib/ipsec/sa.h
> index 107ebd1519..5e237f3525 100644
> --- a/lib/ipsec/sa.h
> +++ b/lib/ipsec/sa.h
> @@ -113,6 +113,10 @@ struct rte_ipsec_sa {
> uint8_t iv_len;
> uint8_t pad_align;
> uint8_t tos_mask;
> + struct {
> + uint8_t enabled:1;
> + uint16_t mss;
> + } tso;
Wouldn't one field be enough?
uint16_t tso_mss;
And it it is zero, then tso is disabled.
In fact, do we need it at all?
Wouldn't it be better to request user to fill mbuf->tso_segsz properly for us?
>
> /* template for tunnel header */
> uint8_t hdr[IPSEC_MAX_HDR_SIZE];
> --
> 2.25.1
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