net: xilinx: axienet: Relax partial rx checksum checks

The partial rx checksum feature computes a checksum over the entire
packet, regardless of the L3 protocol. Remove the check for IPv4.
Additionally, testing with csum.py (from kselftests) shows no anomalies
with 64-byte packets, so we can remove that check as well.

Signed-off-by: Sean Anderson <sean.anderson@linux.dev>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240909161016.1149119-5-sean.anderson@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: Sean Anderson

drivers/net/ethernet/xilinx/xilinx_axienet_main.c

@@ -1188,9 +1188,7 @@ static int axienet_rx_poll(struct napi_struct *napi, int budget)
 				    csumstatus == XAE_IP_UDP_CSUM_VALIDATED) {
 					skb->ip_summed = CHECKSUM_UNNECESSARY;
 				}
-			} else if ((lp->features & XAE_FEATURE_PARTIAL_RX_CSUM) != 0 &&
-				   skb->protocol == htons(ETH_P_IP) &&
-				   skb->len > 64) {
+			} else if (lp->features & XAE_FEATURE_PARTIAL_RX_CSUM) {
 				skb->csum = be32_to_cpu(cur_p->app3 & 0xFFFF);
 				skb->ip_summed = CHECKSUM_COMPLETE;
 			}