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Message-ID: <eb6a3c29-ba18-ec42-0a95-76f0af0cd1b4@oracle.com>
Date: Wed, 6 Dec 2017 21:43:39 -0800
From: Shannon Nelson <shannon.nelson@...cle.com>
To: Alexander Duyck <alexander.duyck@...il.com>
Cc: intel-wired-lan <intel-wired-lan@...ts.osuosl.org>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
Steffen Klassert <steffen.klassert@...unet.com>,
Sowmini Varadhan <sowmini.varadhan@...cle.com>,
Netdev <netdev@...r.kernel.org>
Subject: Re: [Intel-wired-lan] [next-queue 07/10] ixgbe: process the Rx ipsec
offload
On 12/5/2017 9:40 AM, Alexander Duyck wrote:
> On Mon, Dec 4, 2017 at 9:35 PM, Shannon Nelson
> <shannon.nelson@...cle.com> wrote:
>> If the chip sees and decrypts an ipsec offload, set up the skb
>> sp pointer with the ralated SA info. Since the chip is rude
>> enough to keep to itself the table index it used for the
>> decryption, we have to do our own table lookup, using the
>> hash for speed.
>>
>> Signed-off-by: Shannon Nelson <shannon.nelson@...cle.com>
>> ---
>> drivers/net/ethernet/intel/ixgbe/ixgbe.h | 6 ++
>> drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c | 89 ++++++++++++++++++++++++++
>> drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 3 +
>> 3 files changed, 98 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
>> index 7e8bca7..77f07dc 100644
>> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
>> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
>> @@ -1009,9 +1009,15 @@ s32 ixgbe_negotiate_fc(struct ixgbe_hw *hw, u32 adv_reg, u32 lp_reg,
>> u32 adv_sym, u32 adv_asm, u32 lp_sym, u32 lp_asm);
>> #ifdef CONFIG_XFRM_OFFLOAD
>> void ixgbe_init_ipsec_offload(struct ixgbe_adapter *adapter);
>> +void ixgbe_ipsec_rx(struct ixgbe_ring *rx_ring,
>> + union ixgbe_adv_rx_desc *rx_desc,
>> + struct sk_buff *skb);
>> void ixgbe_ipsec_restore(struct ixgbe_adapter *adapter);
>> #else
>> static inline void ixgbe_init_ipsec_offload(struct ixgbe_adapter *adapter) { };
>> +static inline void ixgbe_ipsec_rx(struct ixgbe_ring *rx_ring,
>> + union ixgbe_adv_rx_desc *rx_desc,
>> + struct sk_buff *skb) { };
>> static inline void ixgbe_ipsec_restore(struct ixgbe_adapter *adapter) { };
>> #endif /* CONFIG_XFRM_OFFLOAD */
>> #endif /* _IXGBE_H_ */
>> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
>> index b93ee7f..fd06d9b 100644
>> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
>> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
>> @@ -379,6 +379,35 @@ static int ixgbe_ipsec_find_empty_idx(struct ixgbe_ipsec *ipsec, bool rxtable)
>> }
>>
>> /**
>> + * ixgbe_ipsec_find_rx_state - find the state that matches
>> + * @ipsec: pointer to ipsec struct
>> + * @daddr: inbound address to match
>> + * @proto: protocol to match
>> + * @spi: SPI to match
>> + *
>> + * Returns a pointer to the matching SA state information
>> + **/
>> +static struct xfrm_state *ixgbe_ipsec_find_rx_state(struct ixgbe_ipsec *ipsec,
>> + __be32 daddr, u8 proto,
>> + __be32 spi)
>> +{
>> + struct rx_sa *rsa;
>> + struct xfrm_state *ret = NULL;
>> +
>> + rcu_read_lock();
>> + hash_for_each_possible_rcu(ipsec->rx_sa_list, rsa, hlist, spi)
>> + if (spi == rsa->xs->id.spi &&
>> + daddr == rsa->xs->id.daddr.a4 &&
>> + proto == rsa->xs->id.proto) {
>> + ret = rsa->xs;
>> + xfrm_state_hold(ret);
>> + break;
>> + }
>> + rcu_read_unlock();
>> + return ret;
>> +}
>> +
>
> You need to choose a bucket, not just walk through all buckets.
I may be wrong, but I believe that is what is happening here, where the
spi is the hash key. As the function description says "iterate over all
possible objects hashing to the same bucket". Besides, I basically
cribbed this directly from our Mellanox friends (thanks!).
> Otherwise you might as well have just used a linked list. You might
> look at using something like jhash_3words to generate a hash which you
> then use to choose the bucket.
>
>> +/**
>> * ixgbe_ipsec_parse_proto_keys - find the key and salt based on the protocol
>> * @xs: pointer to xfrm_state struct
>> * @mykey: pointer to key array to populate
>> @@ -680,6 +709,66 @@ static const struct xfrmdev_ops ixgbe_xfrmdev_ops = {
>> };
>>
>> /**
>> + * ixgbe_ipsec_rx - decode ipsec bits from Rx descriptor
>> + * @rx_ring: receiving ring
>> + * @rx_desc: receive data descriptor
>> + * @skb: current data packet
>> + *
>> + * Determine if there was an ipsec encapsulation noticed, and if so set up
>> + * the resulting status for later in the receive stack.
>> + **/
>> +void ixgbe_ipsec_rx(struct ixgbe_ring *rx_ring,
>> + union ixgbe_adv_rx_desc *rx_desc,
>> + struct sk_buff *skb)
>> +{
>> + struct ixgbe_adapter *adapter = netdev_priv(rx_ring->netdev);
>> + u16 pkt_info = le16_to_cpu(rx_desc->wb.lower.lo_dword.hs_rss.pkt_info);
>> + u16 ipsec_pkt_types = IXGBE_RXDADV_PKTTYPE_IPSEC_AH |
>> + IXGBE_RXDADV_PKTTYPE_IPSEC_ESP;
>> + struct ixgbe_ipsec *ipsec = adapter->ipsec;
>> + struct xfrm_offload *xo = NULL;
>> + struct xfrm_state *xs = NULL;
>> + struct iphdr *iph;
>> + u8 *c_hdr;
>> + __be32 spi;
>> + u8 proto;
>> +
>> + /* we can assume no vlan header in the way, b/c the
>> + * hw won't recognize the IPsec packet and anyway the
>> + * currently vlan device doesn't support xfrm offload.
>> + */
>> + /* TODO: not supporting IPv6 yet */
>> + iph = (struct iphdr *)(skb->data + ETH_HLEN);
>> + c_hdr = (u8 *)iph + iph->ihl * 4;
>> + switch (pkt_info & ipsec_pkt_types) {
>> + case IXGBE_RXDADV_PKTTYPE_IPSEC_AH:
>> + spi = ((struct ip_auth_hdr *)c_hdr)->spi;
>> + proto = IPPROTO_AH;
>> + break;
>> + case IXGBE_RXDADV_PKTTYPE_IPSEC_ESP:
>> + spi = ((struct ip_esp_hdr *)c_hdr)->spi;
>> + proto = IPPROTO_ESP;
>> + break;
>> + default:
>> + return;
>> + }
>> +
>> + xs = ixgbe_ipsec_find_rx_state(ipsec, iph->daddr, proto, spi);
>> + if (unlikely(!xs))
>> + return;
>> +
>> + skb->sp = secpath_dup(skb->sp);
>> + if (unlikely(!skb->sp))
>> + return;
>> +
>> + skb->sp->xvec[skb->sp->len++] = xs;
>> + skb->sp->olen++;
>> + xo = xfrm_offload(skb);
>> + xo->flags = CRYPTO_DONE;
>> + xo->status = CRYPTO_SUCCESS;
>> +}
>> +
>> +/**
>> * ixgbe_init_ipsec_offload - initialize security registers for IPSec operation
>> * @adapter: board private structure
>> **/
>> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>> index 6eabf92..60f9f2d 100644
>> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>> @@ -1755,6 +1755,9 @@ static void ixgbe_process_skb_fields(struct ixgbe_ring *rx_ring,
>>
>> skb_record_rx_queue(skb, rx_ring->queue_index);
>>
>> + if (ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_STAT_SECP))
>> + ixgbe_ipsec_rx(rx_ring, rx_desc, skb);
>> +
>> skb->protocol = eth_type_trans(skb, dev);
>> }
>>
>> --
>> 2.7.4
>>
>> _______________________________________________
>> Intel-wired-lan mailing list
>> Intel-wired-lan@...osl.org
>> https://lists.osuosl.org/mailman/listinfo/intel-wired-lan
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