idpf: fix handling rsc packet with a single segment

BugLink: https://bugs.launchpad.net/bugs/2104873

[ Upstream commit 69ab25a ]

Handle rsc packet with a single segment same as a multi
segment rsc packet so that CHECKSUM_PARTIAL is set in the
skb->ip_summed field. The current code is passing CHECKSUM_NONE
resulting in TCP GRO layer doing checksum in SW and hiding the
issue. This will fail when using dmabufs as payload buffers as
skb frag would be unreadable.

Fixes: 3a8845a ("idpf: add RX splitq napi poll support")
Signed-off-by: Sridhar Samudrala <[email protected]>
Reviewed-by: Przemek Kitszel <[email protected]>
Tested-by: Samuel Salin <[email protected]>
Signed-off-by: Tony Nguyen <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
Signed-off-by: Noah Wager <[email protected]>

Author: ssamudrala

drivers/net/ethernet/intel/idpf/idpf_txrx.c

@@ -3024,8 +3024,6 @@ static int idpf_rx_rsc(struct idpf_rx_queue *rxq, struct sk_buff *skb,
 		return -EINVAL;
 
 	rsc_segments = DIV_ROUND_UP(skb->data_len, rsc_seg_len);
-	if (unlikely(rsc_segments == 1))
-		return 0;
 
 	NAPI_GRO_CB(skb)->count = rsc_segments;
 	skb_shinfo(skb)->gso_size = rsc_seg_len;