diff --git a/doc/guides/nics/octeontx2.rst b/doc/guides/nics/octeontx2.rst
index 60187ec..b615585 100644
--- a/doc/guides/nics/octeontx2.rst
+++ b/doc/guides/nics/octeontx2.rst
@@ -177,7 +177,7 @@ Runtime Config Options
 
    With the above configuration, higig2 will be enabled on that port and the
    traffic on this port should be higig2 traffic only. Supported switch header
-   types are "higig2" and "dsa".
+   types are "higig2", "dsa" and "chlen90b".
 
 - ``RSS tag as XOR`` (default ``0``)
 
diff --git a/drivers/common/octeontx2/hw/otx2_npc.h b/drivers/common/octeontx2/hw/otx2_npc.h
index 3dfc137..8083c78 100644
--- a/drivers/common/octeontx2/hw/otx2_npc.h
+++ b/drivers/common/octeontx2/hw/otx2_npc.h
@@ -31,6 +31,7 @@
 	(0x80008ull | (uint64_t)(a) << 6)
 #define NPC_AF_PKINDX_CPI_DEFX(a, b)                 \
 	(0x80020ull | (uint64_t)(a) << 6 | (uint64_t)(b) << 3)
+#define NPC_AF_CHLEN90B_PKIND                        (0x3bull)
 #define NPC_AF_KPUX_ENTRYX_CAMX(a, b, c)             \
 	(0x100000ull | (uint64_t)(a) << 14 | (uint64_t)(b) << 6 | \
 	(uint64_t)(c) << 3)
@@ -184,6 +185,7 @@ enum npc_kpu_la_ltype {
 	NPC_LT_LA_IH_2_ETHER,
 	NPC_LT_LA_HIGIG2_ETHER,
 	NPC_LT_LA_IH_NIX_HIGIG2_ETHER,
+	NPC_LT_LA_CH_LEN_90B_ETHER,   /* Custom L2 header of length 90 bytes */
 };
 
 enum npc_kpu_lb_ltype {
diff --git a/drivers/common/octeontx2/otx2_mbox.h b/drivers/common/octeontx2/otx2_mbox.h
index d192d89..59a2f5e 100644
--- a/drivers/common/octeontx2/otx2_mbox.h
+++ b/drivers/common/octeontx2/otx2_mbox.h
@@ -90,7 +90,7 @@ struct mbox_msghdr {
 #define OTX2_MBOX_RSP_SIG (0xbeef)
 	/* Signature, for validating corrupted msgs */
 	uint16_t __otx2_io sig;
-#define OTX2_MBOX_VERSION (0x0004)
+#define OTX2_MBOX_VERSION (0x0006)
 	/* Version of msg's structure for this ID */
 	uint16_t __otx2_io ver;
 	/* Offset of next msg within mailbox region */
@@ -341,6 +341,7 @@ struct npc_set_pkind {
 #define OTX2_PRIV_FLAGS_DEFAULT  BIT_ULL(0)
 #define OTX2_PRIV_FLAGS_EDSA     BIT_ULL(1)
 #define OTX2_PRIV_FLAGS_HIGIG    BIT_ULL(2)
+#define OTX2_PRIV_FLAGS_LEN_90B  BIT_ULL(3)
 #define OTX2_PRIV_FLAGS_CUSTOM   BIT_ULL(63)
 	uint64_t __otx2_io mode;
 #define PKIND_TX		BIT_ULL(0)
@@ -923,6 +924,7 @@ struct nix_rss_flowkey_cfg {
 #define FLOW_KEY_TYPE_INNR_UDP      BIT(15)
 #define FLOW_KEY_TYPE_INNR_SCTP     BIT(16)
 #define FLOW_KEY_TYPE_INNR_ETH_DMAC BIT(17)
+#define FLOW_KEY_TYPE_CH_LEN_90B	BIT(18)
 #define FLOW_KEY_TYPE_L4_DST BIT(28)
 #define FLOW_KEY_TYPE_L4_SRC BIT(29)
 #define FLOW_KEY_TYPE_L3_DST BIT(30)
diff --git a/drivers/net/octeontx2/otx2_ethdev.c b/drivers/net/octeontx2/otx2_ethdev.c
index e60f490..2f2f1b6 100644
--- a/drivers/net/octeontx2/otx2_ethdev.c
+++ b/drivers/net/octeontx2/otx2_ethdev.c
@@ -106,6 +106,12 @@
 	if (dev->npc_flow.switch_header_type == 0)
 		return 0;
 
+	if (dev->npc_flow.switch_header_type == OTX2_PRIV_FLAGS_LEN_90B &&
+	    !otx2_dev_is_sdp(dev)) {
+		otx2_err("chlen90b is not supported on non-SDP device");
+		return -EINVAL;
+	}
+
 	/* Notify AF about higig2 config */
 	req = otx2_mbox_alloc_msg_npc_set_pkind(mbox);
 	req->mode = dev->npc_flow.switch_header_type;
diff --git a/drivers/net/octeontx2/otx2_ethdev_devargs.c b/drivers/net/octeontx2/otx2_ethdev_devargs.c
index f29f015..83868bc 100644
--- a/drivers/net/octeontx2/otx2_ethdev_devargs.c
+++ b/drivers/net/octeontx2/otx2_ethdev_devargs.c
@@ -113,6 +113,8 @@
 	if (strcmp(value, "dsa") == 0)
 		*(uint16_t *)extra_args = OTX2_PRIV_FLAGS_EDSA;
 
+	if (strcmp(value, "chlen90b") == 0)
+		*(uint16_t *)extra_args = OTX2_PRIV_FLAGS_LEN_90B;
 	return 0;
 }
 
@@ -185,5 +187,5 @@
 			      OTX2_MAX_SQB_COUNT "=<8-512>"
 			      OTX2_FLOW_PREALLOC_SIZE "=<1-32>"
 			      OTX2_FLOW_MAX_PRIORITY "=<1-32>"
-			      OTX2_SWITCH_HEADER_TYPE "=<higig2|dsa>"
+			      OTX2_SWITCH_HEADER_TYPE "=<higig2|dsa|chlen90b>"
 			      OTX2_RSS_TAG_AS_XOR "=1");
diff --git a/drivers/net/octeontx2/otx2_rss.c b/drivers/net/octeontx2/otx2_rss.c
index 7a8c8f3..a29441e 100644
--- a/drivers/net/octeontx2/otx2_rss.c
+++ b/drivers/net/octeontx2/otx2_rss.c
@@ -210,6 +210,11 @@
 
 	dev->rss_info.nix_rss = ethdev_rss;
 
+	if (ethdev_rss & ETH_RSS_L2_PAYLOAD &&
+	    dev->npc_flow.switch_header_type == OTX2_PRIV_FLAGS_LEN_90B) {
+		flowkey_cfg |= FLOW_KEY_TYPE_CH_LEN_90B;
+	}
+
 	if (ethdev_rss & ETH_RSS_L3_SRC_ONLY)
 		flowkey_cfg |= FLOW_KEY_TYPE_L3_SRC;
 
