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tilegx: fix some issues in the SW TSO support 

This change correctly computes the header length and data length in
the fragments to avoid a bug where we would end up with extremely
slow performance.  Also adopt use of skb_frag_size() accessor.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Cc: stable@vger.kernel.org [v3.6]
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Chris Metcalf 2012-10-25 07:25:20 +00:00 committed by David S. Miller
parent f8295ec22c
commit 3da3fff800
1 changed files with 19 additions and 16 deletions
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35
drivers/net/ethernet/tile/tilegx.c
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@ -1334,11 +1334,11 @@ static int tso_count_edescs(struct sk_buff *skb)
{
struct skb_shared_info *sh = skb_shinfo(skb);
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 data_len = skb->len - sh_len;
unsigned int p_len = sh->gso_size;
long f_id = -1; /* id of 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 f_size = skb_headlen(skb) - sh_len; /* current fragment size */
long f_used = 0; /* bytes used from the current fragment */
long n; /* size of the current piece of payload */
int num_edescs = 0;
int segment;
@ -1353,7 +1353,7 @@ static int tso_count_edescs(struct sk_buff *skb)
/* Advance as needed. */
while (f_used >= f_size) {
f_id++;
f_size = sh->frags[f_id].size;
f_size = skb_frag_size(&sh->frags[f_id]);
f_used = 0;
}
@ -1384,13 +1384,13 @@ static void tso_headers_prepare(struct sk_buff *skb, unsigned char *headers,
struct iphdr *ih;
struct tcphdr *th;
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 data_len = skb->len - sh_len;
unsigned char *data = skb->data;
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 = skb->hdr_len; /* size of the current fragment */
long f_used = sh_len; /* bytes used from the current fragment */
long f_size = skb_headlen(skb) - sh_len; /* current fragment size */
long f_used = 0; /* bytes used from the current fragment */
long n; /* size of the current piece of payload */
int segment;
@ -1405,7 +1405,7 @@ static void tso_headers_prepare(struct sk_buff *skb, unsigned char *headers,
isum_seed = ((0xFFFF - ih->check) +
(0xFFFF - ih->tot_len) +
(0xFFFF - ih->id));
tsum_seed = th->check + (0xFFFF ^ htons(sh_len + data_len));
tsum_seed = th->check + (0xFFFF ^ htons(skb->len));
id = ntohs(ih->id);
seq = ntohl(th->seq);
@ -1444,7 +1444,7 @@ static void tso_headers_prepare(struct sk_buff *skb, unsigned char *headers,
/* Advance as needed. */
while (f_used >= f_size) {
f_id++;
f_size = sh->frags[f_id].size;
f_size = skb_frag_size(&sh->frags[f_id]);
f_used = 0;
}
@ -1478,14 +1478,14 @@ 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 sh_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
unsigned int data_len = skb->data_len + skb->hdr_len - sh_len;
unsigned int data_len = skb->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 = 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 f_size = skb_headlen(skb) - sh_len; /* current fragment size */
long f_used = 0; /* bytes used from the current fragment */
void *f_data = skb->data + sh_len;
long n; /* size of the current piece of payload */
unsigned long tx_packets = 0, tx_bytes = 0;
unsigned int csum_start;
@ -1516,15 +1516,18 @@ static void tso_egress(struct net_device *dev, gxio_mpipe_equeue_t *equeue,
/* Egress the payload. */
while (p_used < p_len) {
void *va;
/* Advance as needed. */
while (f_used >= f_size) {
f_id++;
f_size = sh->frags[f_id].size;
f_used = 0;
f_size = skb_frag_size(&sh->frags[f_id]);
f_data = tile_net_frag_buf(&sh->frags[f_id]);
f_used = 0;
}
va = f_data + f_used;
/* Use bytes from the current fragment. */
n = p_len - p_used;
if (n > f_size - f_used)
@ -1533,7 +1536,7 @@ 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(f_data) + f_used;
edesc_body.va = va_to_tile_io_addr(va);
edesc_body.xfer_size = n;
edesc_body.bound = !(p_used < p_len);
gxio_mpipe_equeue_put_at(equeue, edesc_body, slot);