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tilegx net driver: handle payload data not in frags 

The original driver implementation assumed that for TSO, all the
payload data would be in the frags.  This isn't always true; change
the driver to support payload data at skb->data between
"skb_transport_offset(skb) + tcp_hdrlen(skb)" and "skb->hdr_len",
followed by the data in the frags.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf 2012-07-11 14:08:21 -04:00
parent 9b4c341b1e
commit 8388546e79
1 changed files with 18 additions and 18 deletions
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36
drivers/net/ethernet/tile/tilegx.c
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@ -1333,11 +1333,12 @@ static s64 tile_net_equeue_try_reserve(struct net_device *dev,
static int tso_count_edescs(struct sk_buff *skb)
{
struct skb_shared_info *sh = skb_shinfo(skb);
unsigned int data_len = skb->data_len;
unsigned int sh_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
unsigned int data_len = skb->data_len + skb->hdr_len - sh_len;
unsigned int p_len = sh->gso_size;
long f_id = -1; /* id of the current fragment */
long f_size = -1; /* size of the current fragment */
long f_used = -1; /* bytes used from the current fragment */
long f_size = skb->hdr_len; /* size of the current fragment */
long f_used = sh_len; /* bytes used from the current fragment */
long n; /* size of the current piece of payload */
int num_edescs = 0;
int segment;
@ -1382,13 +1383,14 @@ static void tso_headers_prepare(struct sk_buff *skb, unsigned char *headers,
struct skb_shared_info *sh = skb_shinfo(skb);
struct iphdr *ih;
struct tcphdr *th;
unsigned int data_len = skb->data_len;
unsigned int sh_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
unsigned int data_len = skb->data_len + skb->hdr_len - sh_len;
unsigned char *data = skb->data;
unsigned int ih_off, th_off, sh_len, p_len;
unsigned int ih_off, th_off, p_len;
unsigned int isum_seed, tsum_seed, id, seq;
long f_id = -1; /* id of the current fragment */
long f_size = -1; /* size of the current fragment */
long f_used = -1; /* bytes used from the current fragment */
long f_size = skb->hdr_len; /* size of the current fragment */
long f_used = sh_len; /* bytes used from the current fragment */
long n; /* size of the current piece of payload */
int segment;
@ -1397,14 +1399,13 @@ static void tso_headers_prepare(struct sk_buff *skb, unsigned char *headers,
th = tcp_hdr(skb);
ih_off = skb_network_offset(skb);
th_off = skb_transport_offset(skb);
sh_len = th_off + tcp_hdrlen(skb);
p_len = sh->gso_size;
/* Set up seed values for IP and TCP csum and initialize id and seq. */
isum_seed = ((0xFFFF - ih->check) +
(0xFFFF - ih->tot_len) +
(0xFFFF - ih->id));
tsum_seed = th->check + (0xFFFF ^ htons(skb->len));
tsum_seed = th->check + (0xFFFF ^ htons(sh_len + data_len));
id = ntohs(ih->id);
seq = ntohl(th->seq);
@ -1476,21 +1477,22 @@ static void tso_egress(struct net_device *dev, gxio_mpipe_equeue_t *equeue,
{
struct tile_net_priv *priv = netdev_priv(dev);
struct skb_shared_info *sh = skb_shinfo(skb);
unsigned int data_len = skb->data_len;
unsigned int sh_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
unsigned int data_len = skb->data_len + skb->hdr_len - sh_len;
unsigned int p_len = sh->gso_size;
gxio_mpipe_edesc_t edesc_head = { { 0 } };
gxio_mpipe_edesc_t edesc_body = { { 0 } };
long f_id = -1; /* id of the current fragment */
long f_size = -1; /* size of the current fragment */
long f_used = -1; /* bytes used from the current fragment */
long f_size = skb->hdr_len; /* size of the current fragment */
long f_used = sh_len; /* bytes used from the current fragment */
void *f_data = skb->data;
long n; /* size of the current piece of payload */
unsigned long tx_packets = 0, tx_bytes = 0;
unsigned int csum_start, sh_len;
unsigned int csum_start;
int segment;
/* Prepare to egress the headers: set up header edesc. */
csum_start = skb_checksum_start_offset(skb);
sh_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
edesc_head.csum = 1;
edesc_head.csum_start = csum_start;
edesc_head.csum_dest = csum_start + skb->csum_offset;
@ -1502,7 +1504,6 @@ static void tso_egress(struct net_device *dev, gxio_mpipe_equeue_t *equeue,
/* Egress all the edescs. */
for (segment = 0; segment < sh->gso_segs; segment++) {
void *va;
unsigned char *buf;
unsigned int p_used = 0;
@ -1521,10 +1522,9 @@ static void tso_egress(struct net_device *dev, gxio_mpipe_equeue_t *equeue,
f_id++;
f_size = sh->frags[f_id].size;
f_used = 0;
f_data = tile_net_frag_buf(&sh->frags[f_id]);
}
va = tile_net_frag_buf(&sh->frags[f_id]) + f_used;
/* Use bytes from the current fragment. */
n = p_len - p_used;
if (n > f_size - f_used)
@ -1533,7 +1533,7 @@ static void tso_egress(struct net_device *dev, gxio_mpipe_equeue_t *equeue,
p_used += n;
/* Egress a piece of the payload. */
edesc_body.va = va_to_tile_io_addr(va);
edesc_body.va = va_to_tile_io_addr(f_data) + f_used;
edesc_body.xfer_size = n;
edesc_body.bound = !(p_used < p_len);
gxio_mpipe_equeue_put_at(equeue, edesc_body, slot);