wil6210: add scatter-gather support
When setting fragmented skb for Tx, assign skb to the last descriptor
and set number of fragments in the 1-st one
On Tx complete, HW sets "DU" bit in Tx descriptor only for the last
descriptor; so search for it using number of fragments field.
Middle descriptors may have "DU" bit not set by the hardware.
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/wil6210/debugfs.c b/drivers/net/wireless/ath/wil6210/debugfs.c
index ea868be..ecdabe4 100644
--- a/drivers/net/wireless/ath/wil6210/debugfs.c
+++ b/drivers/net/wireless/ath/wil6210/debugfs.c
@@ -398,6 +398,44 @@
.open = simple_open,
};
+static void wil_seq_hexdump(struct seq_file *s, void *p, int len,
+ const char *prefix)
+{
+ char printbuf[16 * 3 + 2];
+ int i = 0;
+ while (i < len) {
+ int l = min(len - i, 16);
+ hex_dump_to_buffer(p + i, l, 16, 1, printbuf,
+ sizeof(printbuf), false);
+ seq_printf(s, "%s%s\n", prefix, printbuf);
+ i += l;
+ }
+}
+
+static void wil_seq_print_skb(struct seq_file *s, struct sk_buff *skb)
+{
+ int i = 0;
+ int len = skb_headlen(skb);
+ void *p = skb->data;
+ int nr_frags = skb_shinfo(skb)->nr_frags;
+
+ seq_printf(s, " len = %d\n", len);
+ wil_seq_hexdump(s, p, len, " : ");
+
+ if (nr_frags) {
+ seq_printf(s, " nr_frags = %d\n", nr_frags);
+ for (i = 0; i < nr_frags; i++) {
+ const struct skb_frag_struct *frag =
+ &skb_shinfo(skb)->frags[i];
+
+ len = skb_frag_size(frag);
+ p = skb_frag_address_safe(frag);
+ seq_printf(s, " [%2d] : len = %d\n", i, len);
+ wil_seq_hexdump(s, p, len, " : ");
+ }
+ }
+}
+
/*---------Tx/Rx descriptor------------*/
static int wil_txdesc_debugfs_show(struct seq_file *s, void *data)
{
@@ -438,26 +476,9 @@
seq_printf(s, " SKB = %p\n", skb);
if (skb) {
- char printbuf[16 * 3 + 2];
- int i = 0;
- int len = le16_to_cpu(d->dma.length);
- void *p = skb->data;
-
- if (len != skb_headlen(skb)) {
- seq_printf(s, "!!! len: desc = %d skb = %d\n",
- len, skb_headlen(skb));
- len = min_t(int, len, skb_headlen(skb));
- }
-
- seq_printf(s, " len = %d\n", len);
-
- while (i < len) {
- int l = min(len - i, 16);
- hex_dump_to_buffer(p + i, l, 16, 1, printbuf,
- sizeof(printbuf), false);
- seq_printf(s, " : %s\n", printbuf);
- i += l;
- }
+ skb_get(skb);
+ wil_seq_print_skb(s, skb);
+ kfree_skb(skb);
}
seq_printf(s, "}\n");
} else {