ch_ktls: Correction in finding correct length

There is a possibility of linear skbs coming in. Correcting
the length extraction logic.

v2->v3:
- Separated un-related changes from this patch.

Fixes: 5a4b9fe7fece ("cxgb4/chcr: complete record tx handling")
Signed-off-by: Rohit Maheshwari <rohitm@chelsio.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.c b/drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.c
index 43c723c..447aec7 100644 (file)
--- a/drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.c
+++ b/drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.c
@@ -967,7 +967,7 @@ chcr_ktls_write_tcp_options(struct chcr_ktls_info *tx_info, struct sk_buff *skb,
        /* packet length = eth hdr len + ip hdr len + tcp hdr len
         * (including options).
         */
-       pktlen = skb->len - skb->data_len;
+       pktlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
 
        ctrl = sizeof(*cpl) + pktlen;
        len16 = DIV_ROUND_UP(sizeof(*wr) + ctrl, 16);
@@ -1860,6 +1860,7 @@ out:
 /* nic tls TX handler */
 static int chcr_ktls_xmit(struct sk_buff *skb, struct net_device *dev)
 {
+       u32 tls_end_offset, tcp_seq, skb_data_len, skb_offset;
        struct ch_ktls_port_stats_debug *port_stats;
        struct chcr_ktls_ofld_ctx_tx *tx_ctx;
        struct ch_ktls_stats_debug *stats;
@@ -1867,7 +1868,6 @@ static int chcr_ktls_xmit(struct sk_buff *skb, struct net_device *dev)
        int data_len, qidx, ret = 0, mss;
        struct tls_record_info *record;
        struct chcr_ktls_info *tx_info;
-       u32 tls_end_offset, tcp_seq;
        struct tls_context *tls_ctx;
        struct sk_buff *local_skb;
        struct sge_eth_txq *q;
@@ -1875,8 +1875,11 @@ static int chcr_ktls_xmit(struct sk_buff *skb, struct net_device *dev)
        unsigned long flags;
 
        tcp_seq = ntohl(th->seq);
+       skb_offset = skb_transport_offset(skb) + tcp_hdrlen(skb);
+       skb_data_len = skb->len - skb_offset;
+       data_len = skb_data_len;
 
-       mss = skb_is_gso(skb) ? skb_shinfo(skb)->gso_size : skb->data_len;
+       mss = skb_is_gso(skb) ? skb_shinfo(skb)->gso_size : data_len;
 
        tls_ctx = tls_get_ctx(skb->sk);
        if (unlikely(tls_ctx->netdev != dev))
@@ -1922,8 +1925,6 @@ static int chcr_ktls_xmit(struct sk_buff *skb, struct net_device *dev)
        /* copy skb contents into local skb */
        chcr_ktls_skb_copy(skb, local_skb);
 
-       /* go through the skb and send only one record at a time. */
-       data_len = skb->data_len;
        /* TCP segments can be in received either complete or partial.
         * chcr_end_part_handler will handle cases if complete record or end
         * part of the record is received. Incase of partial end part of record,
@@ -2020,9 +2021,9 @@ clear_ref:
 
        } while (data_len > 0);
 
-       tx_info->prev_seq = ntohl(th->seq) + skb->data_len;
+       tx_info->prev_seq = ntohl(th->seq) + skb_data_len;
        atomic64_inc(&port_stats->ktls_tx_encrypted_packets);
-       atomic64_add(skb->data_len, &port_stats->ktls_tx_encrypted_bytes);
+       atomic64_add(skb_data_len, &port_stats->ktls_tx_encrypted_bytes);
 
        /* tcp finish is set, send a separate tcp msg including all the options
         * as well.