brcmfmac: use ndev->needed_headroom to reserve additional header space

When using nmap tool with FMAC, the nmap packets were be dropped by kernel because the size was too short. The kernel message showed like "nmap: packet size is too short (42 <= 50)". It is caused by the packet length is shorter than ndev->hard_header_len. According to LL_RESERVED_SPACE() and hard_header_len definition, we should use hard_header_len to reserve L2 header, like ethernet header(ETH_HLEN) in our case and use needed_headroom for the additional headroom needed by hardware. [ Patch from Broadcom ] See: raspberrypi/linux#1357 Signed-off-by: Phil Elwell <[email protected]>
liuqun · Dec 11, 2017 · a8a374a · a8a374a
1 parent 46170ce
commit a8a374a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/drivers/net/wireless/brcm80211/brcmfmac/core.c b/drivers/net/wireless/brcm80211/brcmfmac/core.c
@@ -689,7 +689,7 @@ int brcmf_net_attach(struct brcmf_if *ifp, bool rtnl_locked)
 	/* set appropriate operations */
 	ndev->netdev_ops = &brcmf_netdev_ops_pri;
 
-	ndev->hard_header_len += drvr->hdrlen;
+	ndev->needed_headroom += drvr->hdrlen;
 	ndev->ethtool_ops = &brcmf_ethtool_ops;
 
 	drvr->rxsz = ndev->mtu + ndev->hard_header_len +