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Commit 80616c0d authored by Johannes Berg's avatar Johannes Berg
Browse files

mac80211: allow segmentation offloads 



Implement the necessary software segmentation on the normal
TX path so that fast-xmit can use segmentation offload if
the hardware (or driver) supports it.

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 680a0dab

net/mac80211/main.c

+2 −1
Original line number Diff line number Diff line
@@ -840,7 +840,8 @@ int ieee80211_register_hw(struct ieee80211_hw *hw) 


	/* Only HW csum features are currently compatible with mac80211 */

	feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |

			    NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_HIGHDMA;

			    NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_HIGHDMA |

			    NETIF_F_GSO_SOFTWARE;

	if (WARN_ON(hw->netdev_features & ~feature_whitelist))

		return -EINVAL;

net/mac80211/tx.c

+46 −24
Original line number Diff line number Diff line
@@ -2843,6 +2843,7 @@ void __ieee80211_subif_start_xmit(struct sk_buff *skb, 
{

	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	struct sta_info *sta;

	struct sk_buff *next;



	if (unlikely(skb->len < ETH_HLEN)) {

		kfree_skb(skb);
@@ -2864,15 +2865,26 @@ void __ieee80211_subif_start_xmit(struct sk_buff *skb, 
			goto out;

	}



	if (skb_is_gso(skb)) {

		struct sk_buff *segs;



		segs = skb_gso_segment(skb, 0);

		if (IS_ERR(segs)) {

			goto out_free;

		} else if (segs) {

			consume_skb(skb);

			skb = segs;

		}

	} else {

		/* we cannot process non-linear frames on this path */

		if (skb_linearize(skb)) {

			kfree_skb(skb);

			goto out;

		}



	/* the frame could be fragmented, software-encrypted, and other things

	 * so we cannot really handle checksum offload with it - fix it up in

	 * software before we handle anything else.

		/* the frame could be fragmented, software-encrypted, and other

		 * things so we cannot really handle checksum offload with it -

		 * fix it up in software before we handle anything else.

		 */

		if (skb->ip_summed == CHECKSUM_PARTIAL) {

			if (skb->encapsulation)
@@ -2884,6 +2896,15 @@ void __ieee80211_subif_start_xmit(struct sk_buff *skb, 
			if (skb_checksum_help(skb))

				goto out_free;

		}

	}



	next = skb;

	while (next) {

		skb = next;

		next = skb->next;



		skb->prev = NULL;

		skb->next = NULL;



		skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);

		if (IS_ERR(skb))
@@ -2894,6 +2915,7 @@ void __ieee80211_subif_start_xmit(struct sk_buff *skb, 
		dev->trans_start = jiffies;



		ieee80211_xmit(sdata, sta, skb);

	}

	goto out;

 out_free:

	kfree_skb(skb);