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Date: Wed, 30 Oct 2019 03:59:31 -0400
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, Somnath Kotur <somnath.kotur@...adcom.com>
Subject: [PATCH net-next 3/7] bnxt_en: Add support for NAT(L3/L4 rewrite)
From: Somnath Kotur <somnath.kotur@...adcom.com>
Provides support for modifying L3/L4 Header parameters to support NAT.
Sets the appropriate fields/bits in cfa_flow_alloc cmd.
Sample cmd for offloading an IPv4 flow with SNAT:
ovs-ofctl add-flow ovsbr0 "ip,nw_src=192.168.201.44 \
actions=mod_nw_src:203.31.220.144,output:p7p1"
Replace 'nw_src' with 'nw_dst' in above cmd for DNAT with IPv4
Sample cmd for offloading an IPv4 flow with SNAPT:
ovs-ofctl add-flow ovsbr0 "ip,nw_src=192.168.201.44 \
actions=mod_nw_src:203.31.220.144, mod_tp_src:6789,output:p7p1"
Similar to DNAT, replace 'tp_src' with 'tp_dst' for offloading flow
with DNAPT
Sample cmd for offloading an IPv6 flow with SNAT:
ovs-ofctl add-flow ovsbr0 "ipv6, ipv6_src=2001:5c0:9168::2/64 \
actions=load:0x1->NXM_NX_IPV6_SRC[0..63], \
load:0x20010db801920000->NXM_NX_IPV6_SRC[64..127],output:p7p1"
Replace 'SRC' with DST' above for IPv6 DNAT
Signed-off-by: Somnath Kotur <somnath.kotur@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c | 140 +++++++++++++++++++++++++--
drivers/net/ethernet/broadcom/bnxt/bnxt_tc.h | 11 ++-
2 files changed, 144 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c
index 2d86796..272a9fb 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c
@@ -114,7 +114,8 @@ static int bnxt_tc_parse_tunnel_set(struct bnxt *bp,
return 0;
}
-/* Key & Mask from the stack comes unaligned in multiple iterations.
+/* Key & Mask from the stack comes unaligned in multiple iterations of 4 bytes
+ * each(u32).
* This routine consolidates such multiple unaligned values into one
* field each for Key & Mask (for src and dst macs separately)
* For example,
@@ -178,14 +179,19 @@ bnxt_fill_l2_rewrite_fields(struct bnxt_tc_actions *actions,
static int
bnxt_tc_parse_pedit(struct bnxt *bp, struct bnxt_tc_actions *actions,
- struct flow_action_entry *act, u8 *eth_addr,
+ struct flow_action_entry *act, int act_idx, u8 *eth_addr,
u8 *eth_addr_mask)
{
- u32 mask, val, offset;
+ size_t offset_of_ip6_daddr = offsetof(struct ipv6hdr, daddr);
+ size_t offset_of_ip6_saddr = offsetof(struct ipv6hdr, saddr);
+ u32 mask, val, offset, idx;
u8 htype;
offset = act->mangle.offset;
htype = act->mangle.htype;
+ mask = ~act->mangle.mask;
+ val = act->mangle.val;
+
switch (htype) {
case FLOW_ACT_MANGLE_HDR_TYPE_ETH:
if (offset > PEDIT_OFFSET_SMAC_LAST_4_BYTES) {
@@ -195,12 +201,73 @@ bnxt_tc_parse_pedit(struct bnxt *bp, struct bnxt_tc_actions *actions,
return -EINVAL;
}
actions->flags |= BNXT_TC_ACTION_FLAG_L2_REWRITE;
- mask = ~act->mangle.mask;
- val = act->mangle.val;
bnxt_set_l2_key_mask(val, mask, ð_addr[offset],
ð_addr_mask[offset]);
break;
+ case FLOW_ACT_MANGLE_HDR_TYPE_IP4:
+ actions->flags |= BNXT_TC_ACTION_FLAG_NAT_XLATE;
+ actions->nat.l3_is_ipv4 = true;
+ if (offset == offsetof(struct iphdr, saddr)) {
+ actions->nat.src_xlate = true;
+ actions->nat.l3.ipv4.saddr.s_addr = htonl(val);
+ } else if (offset == offsetof(struct iphdr, daddr)) {
+ actions->nat.src_xlate = false;
+ actions->nat.l3.ipv4.daddr.s_addr = htonl(val);
+ } else {
+ netdev_err(bp->dev,
+ "%s: IPv4_hdr: Invalid pedit field\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ netdev_dbg(bp->dev, "nat.src_xlate = %d src IP: %pI4 dst ip : %pI4\n",
+ actions->nat.src_xlate, &actions->nat.l3.ipv4.saddr,
+ &actions->nat.l3.ipv4.daddr);
+ break;
+
+ case FLOW_ACT_MANGLE_HDR_TYPE_IP6:
+ actions->flags |= BNXT_TC_ACTION_FLAG_NAT_XLATE;
+ actions->nat.l3_is_ipv4 = false;
+ if (offset >= offsetof(struct ipv6hdr, saddr) &&
+ offset < offset_of_ip6_daddr) {
+ /* 16 byte IPv6 address comes in 4 iterations of
+ * 4byte chunks each
+ */
+ actions->nat.src_xlate = true;
+ idx = (offset - offset_of_ip6_saddr) / 4;
+ /* First 4bytes will be copied to idx 0 and so on */
+ actions->nat.l3.ipv6.saddr.s6_addr32[idx] = htonl(val);
+ } else if (offset >= offset_of_ip6_daddr &&
+ offset < offset_of_ip6_daddr + 16) {
+ actions->nat.src_xlate = false;
+ idx = (offset - offset_of_ip6_daddr) / 4;
+ actions->nat.l3.ipv6.saddr.s6_addr32[idx] = htonl(val);
+ } else {
+ netdev_err(bp->dev,
+ "%s: IPv6_hdr: Invalid pedit field\n",
+ __func__);
+ return -EINVAL;
+ }
+ break;
+ case FLOW_ACT_MANGLE_HDR_TYPE_TCP:
+ case FLOW_ACT_MANGLE_HDR_TYPE_UDP:
+ /* HW does not support L4 rewrite alone without L3
+ * rewrite
+ */
+ if (!(actions->flags & BNXT_TC_ACTION_FLAG_NAT_XLATE)) {
+ netdev_err(bp->dev,
+ "Need to specify L3 rewrite as well\n");
+ return -EINVAL;
+ }
+ if (actions->nat.src_xlate)
+ actions->nat.l4.ports.sport = htons(val);
+ else
+ actions->nat.l4.ports.dport = htons(val);
+ netdev_dbg(bp->dev, "actions->nat.sport = %d dport = %d\n",
+ actions->nat.l4.ports.sport,
+ actions->nat.l4.ports.dport);
+ break;
default:
netdev_err(bp->dev, "%s: Unsupported pedit hdr type\n",
__func__);
@@ -258,7 +325,7 @@ static int bnxt_tc_parse_actions(struct bnxt *bp,
break;
/* Packet edit: L2 rewrite, NAT, NAPT */
case FLOW_ACTION_MANGLE:
- rc = bnxt_tc_parse_pedit(bp, actions, act, eth_addr,
+ rc = bnxt_tc_parse_pedit(bp, actions, act, i, eth_addr,
eth_addr_mask);
if (rc)
return rc;
@@ -532,6 +599,67 @@ static int bnxt_hwrm_cfa_flow_alloc(struct bnxt *bp, struct bnxt_tc_flow *flow,
CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_L2_HEADER_REWRITE;
}
+ if (actions->flags & BNXT_TC_ACTION_FLAG_NAT_XLATE) {
+ if (actions->nat.l3_is_ipv4) {
+ action_flags |=
+ CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_NAT_IPV4_ADDRESS;
+
+ if (actions->nat.src_xlate) {
+ action_flags |=
+ CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_NAT_SRC;
+ /* L3 source rewrite */
+ req.nat_ip_address[0] =
+ actions->nat.l3.ipv4.saddr.s_addr;
+ /* L4 source port */
+ if (actions->nat.l4.ports.sport)
+ req.nat_port =
+ actions->nat.l4.ports.sport;
+ } else {
+ action_flags |=
+ CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_NAT_DEST;
+ /* L3 destination rewrite */
+ req.nat_ip_address[0] =
+ actions->nat.l3.ipv4.daddr.s_addr;
+ /* L4 destination port */
+ if (actions->nat.l4.ports.dport)
+ req.nat_port =
+ actions->nat.l4.ports.dport;
+ }
+ netdev_dbg(bp->dev,
+ "req.nat_ip_address: %pI4 src_xlate: %d req.nat_port: %x\n",
+ req.nat_ip_address, actions->nat.src_xlate,
+ req.nat_port);
+ } else {
+ if (actions->nat.src_xlate) {
+ action_flags |=
+ CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_NAT_SRC;
+ /* L3 source rewrite */
+ memcpy(req.nat_ip_address,
+ actions->nat.l3.ipv6.saddr.s6_addr32,
+ sizeof(req.nat_ip_address));
+ /* L4 source port */
+ if (actions->nat.l4.ports.sport)
+ req.nat_port =
+ actions->nat.l4.ports.sport;
+ } else {
+ action_flags |=
+ CFA_FLOW_ALLOC_REQ_ACTION_FLAGS_NAT_DEST;
+ /* L3 destination rewrite */
+ memcpy(req.nat_ip_address,
+ actions->nat.l3.ipv6.daddr.s6_addr32,
+ sizeof(req.nat_ip_address));
+ /* L4 destination port */
+ if (actions->nat.l4.ports.dport)
+ req.nat_port =
+ actions->nat.l4.ports.dport;
+ }
+ netdev_dbg(bp->dev,
+ "req.nat_ip_address: %pI6 src_xlate: %d req.nat_port: %x\n",
+ req.nat_ip_address, actions->nat.src_xlate,
+ req.nat_port);
+ }
+ }
+
if (actions->flags & BNXT_TC_ACTION_FLAG_TUNNEL_DECAP ||
actions->flags & BNXT_TC_ACTION_FLAG_TUNNEL_ENCAP) {
req.tunnel_handle = tunnel_handle;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.h
index 6d0d485..2867549 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.h
@@ -78,6 +78,7 @@ struct bnxt_tc_actions {
#define BNXT_TC_ACTION_FLAG_TUNNEL_ENCAP BIT(6)
#define BNXT_TC_ACTION_FLAG_TUNNEL_DECAP BIT(7)
#define BNXT_TC_ACTION_FLAG_L2_REWRITE BIT(8)
+#define BNXT_TC_ACTION_FLAG_NAT_XLATE BIT(9)
u16 dst_fid;
struct net_device *dst_dev;
@@ -89,7 +90,15 @@ struct bnxt_tc_actions {
#define PEDIT_OFFSET_SMAC_LAST_4_BYTES 0x8
__be16 l2_rewrite_dmac[3];
__be16 l2_rewrite_smac[3];
-
+ struct {
+ bool src_xlate; /* true => translate src,
+ * false => translate dst
+ * Mutually exclusive, i.e cannot set both
+ */
+ bool l3_is_ipv4; /* false means L3 is ipv6 */
+ struct bnxt_tc_l3_key l3;
+ struct bnxt_tc_l4_key l4;
+ } nat;
};
struct bnxt_tc_flow {
--
2.5.1
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