From: Xiaoyun Li <xiaoyun.li@intel.com>
Date: Tue, 2 Mar 2021 07:03:20 +0000 (+0800)
Subject: net/i40e: fix IPv4 fragment offload
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=10127dbacf7c041a1b67b9e962635b31184bd604;p=dpdk.git

net/i40e: fix IPv4 fragment offload

IPv4 fragment_offset mask was required to be 0 no matter what the
spec value was. But zero mask means not caring about fragment_offset
field then both non-frag and frag packets should hit the rule.

But the actual fragment rules should be like the following:
Only non-fragment packets can hit Rule 1:
Rule 1: mask=0x3fff, spec=0
Only fragment packets can hit rule 2:
Rule 2: mask=0x3fff, spec=0x8, last=0x2000

This patch allows the above rules.

Fixes: 42044b69c67d ("net/i40e: support input set selection for FDIR")
Cc: stable@dpdk.org

Signed-off-by: Xiaoyun Li <xiaoyun.li@intel.com>
Acked-by: Beilei Xing <beilei.xing@intel.com>
---

diff --git a/drivers/net/i40e/i40e_flow.c b/drivers/net/i40e/i40e_flow.c
index 4d44282312..3e514d5f38 100644
--- a/drivers/net/i40e/i40e_flow.c
+++ b/drivers/net/i40e/i40e_flow.c
@@ -2433,7 +2433,7 @@ i40e_flow_parse_fdir_pattern(struct rte_eth_dev *dev,
 	const struct rte_flow_item *item = pattern;
 	const struct rte_flow_item_eth *eth_spec, *eth_mask;
 	const struct rte_flow_item_vlan *vlan_spec, *vlan_mask;
-	const struct rte_flow_item_ipv4 *ipv4_spec, *ipv4_mask;
+	const struct rte_flow_item_ipv4 *ipv4_spec, *ipv4_last, *ipv4_mask;
 	const struct rte_flow_item_ipv6 *ipv6_spec, *ipv6_mask;
 	const struct rte_flow_item_tcp *tcp_spec, *tcp_mask;
 	const struct rte_flow_item_udp *udp_spec, *udp_mask;
@@ -2446,7 +2446,6 @@ i40e_flow_parse_fdir_pattern(struct rte_eth_dev *dev,
 
 	uint8_t pctype = 0;
 	uint64_t input_set = I40E_INSET_NONE;
-	uint16_t frag_off;
 	enum rte_flow_item_type item_type;
 	enum rte_flow_item_type next_type;
 	enum rte_flow_item_type l3 = RTE_FLOW_ITEM_TYPE_END;
@@ -2472,7 +2471,7 @@ i40e_flow_parse_fdir_pattern(struct rte_eth_dev *dev,
 	memset(len_arr, 0, sizeof(len_arr));
 	filter->input.flow_ext.customized_pctype = false;
 	for (; item->type != RTE_FLOW_ITEM_TYPE_END; item++) {
-		if (item->last) {
+		if (item->last && item->type != RTE_FLOW_ITEM_TYPE_IPV4) {
 			rte_flow_error_set(error, EINVAL,
 					   RTE_FLOW_ERROR_TYPE_ITEM,
 					   item,
@@ -2611,15 +2610,40 @@ i40e_flow_parse_fdir_pattern(struct rte_eth_dev *dev,
 			l3 = RTE_FLOW_ITEM_TYPE_IPV4;
 			ipv4_spec = item->spec;
 			ipv4_mask = item->mask;
+			ipv4_last = item->last;
 			pctype = I40E_FILTER_PCTYPE_NONF_IPV4_OTHER;
 			layer_idx = I40E_FLXPLD_L3_IDX;
 
+			if (ipv4_last) {
+				if (!ipv4_spec || !ipv4_mask || !outer_ip) {
+					rte_flow_error_set(error, EINVAL,
+						RTE_FLOW_ERROR_TYPE_ITEM,
+						item,
+						"Not support range");
+					return -rte_errno;
+				}
+				/* Only fragment_offset supports range */
+				if (ipv4_last->hdr.version_ihl ||
+				    ipv4_last->hdr.type_of_service ||
+				    ipv4_last->hdr.total_length ||
+				    ipv4_last->hdr.packet_id ||
+				    ipv4_last->hdr.time_to_live ||
+				    ipv4_last->hdr.next_proto_id ||
+				    ipv4_last->hdr.hdr_checksum ||
+				    ipv4_last->hdr.src_addr ||
+				    ipv4_last->hdr.dst_addr) {
+					rte_flow_error_set(error, EINVAL,
+						   RTE_FLOW_ERROR_TYPE_ITEM,
+						   item,
+						   "Not support range");
+					return -rte_errno;
+				}
+			}
 			if (ipv4_spec && ipv4_mask && outer_ip) {
 				/* Check IPv4 mask and update input set */
 				if (ipv4_mask->hdr.version_ihl ||
 				    ipv4_mask->hdr.total_length ||
 				    ipv4_mask->hdr.packet_id ||
-				    ipv4_mask->hdr.fragment_offset ||
 				    ipv4_mask->hdr.hdr_checksum) {
 					rte_flow_error_set(error, EINVAL,
 						   RTE_FLOW_ERROR_TYPE_ITEM,
@@ -2640,11 +2664,56 @@ i40e_flow_parse_fdir_pattern(struct rte_eth_dev *dev,
 					input_set |= I40E_INSET_IPV4_PROTO;
 
 				/* Check if it is fragment. */
-				frag_off = ipv4_spec->hdr.fragment_offset;
-				frag_off = rte_be_to_cpu_16(frag_off);
-				if (frag_off & RTE_IPV4_HDR_OFFSET_MASK ||
-				    frag_off & RTE_IPV4_HDR_MF_FLAG)
-					pctype = I40E_FILTER_PCTYPE_FRAG_IPV4;
+				uint16_t frag_mask =
+					ipv4_mask->hdr.fragment_offset;
+				uint16_t frag_spec =
+					ipv4_spec->hdr.fragment_offset;
+				uint16_t frag_last = 0;
+				if (ipv4_last)
+					frag_last =
+					ipv4_last->hdr.fragment_offset;
+				if (frag_mask) {
+					frag_mask = rte_be_to_cpu_16(frag_mask);
+					frag_spec = rte_be_to_cpu_16(frag_spec);
+					frag_last = rte_be_to_cpu_16(frag_last);
+					/* frag_off mask has to be 0x3fff */
+					if (frag_mask !=
+					    (RTE_IPV4_HDR_OFFSET_MASK |
+					    RTE_IPV4_HDR_MF_FLAG)) {
+						rte_flow_error_set(error,
+						   EINVAL,
+						   RTE_FLOW_ERROR_TYPE_ITEM,
+						   item,
+						   "Invalid IPv4 fragment_offset mask");
+						return -rte_errno;
+					}
+					/*
+					 * non-frag rule:
+					 * mask=0x3fff,spec=0
+					 * frag rule:
+					 * mask=0x3fff,spec=0x8,last=0x2000
+					 */
+					if (frag_spec ==
+					    (1 << RTE_IPV4_HDR_FO_SHIFT) &&
+					    frag_last == RTE_IPV4_HDR_MF_FLAG) {
+						pctype =
+						  I40E_FILTER_PCTYPE_FRAG_IPV4;
+					} else if (frag_spec || frag_last) {
+						rte_flow_error_set(error,
+						   EINVAL,
+						   RTE_FLOW_ERROR_TYPE_ITEM,
+						   item,
+						   "Invalid IPv4 fragment_offset rule");
+						return -rte_errno;
+					}
+				} else if (frag_spec || frag_last) {
+					rte_flow_error_set(error,
+						EINVAL,
+						RTE_FLOW_ERROR_TYPE_ITEM,
+						item,
+						"Invalid fragment_offset");
+					return -rte_errno;
+				}
 
 				if (input_set & (I40E_INSET_DMAC | I40E_INSET_SMAC)) {
 					if (input_set & (I40E_INSET_IPV4_SRC |