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Diffstat (limited to 'drivers/net/sfc/tx.c')
-rw-r--r--drivers/net/sfc/tx.c184
1 files changed, 98 insertions, 86 deletions
diff --git a/drivers/net/sfc/tx.c b/drivers/net/sfc/tx.c
index 489c4de31447..e669f94e821b 100644
--- a/drivers/net/sfc/tx.c
+++ b/drivers/net/sfc/tx.c
@@ -1,7 +1,7 @@
/****************************************************************************
* Driver for Solarflare Solarstorm network controllers and boards
* Copyright 2005-2006 Fen Systems Ltd.
- * Copyright 2005-2008 Solarflare Communications Inc.
+ * Copyright 2005-2009 Solarflare Communications Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
@@ -12,12 +12,13 @@
#include <linux/tcp.h>
#include <linux/ip.h>
#include <linux/in.h>
+#include <linux/ipv6.h>
+#include <net/ipv6.h>
#include <linux/if_ether.h>
#include <linux/highmem.h>
#include "net_driver.h"
-#include "tx.h"
#include "efx.h"
-#include "falcon.h"
+#include "nic.h"
#include "workarounds.h"
/*
@@ -26,8 +27,7 @@
* The tx_queue descriptor ring fill-level must fall below this value
* before we restart the netif queue
*/
-#define EFX_NETDEV_TX_THRESHOLD(_tx_queue) \
- (_tx_queue->efx->type->txd_ring_mask / 2u)
+#define EFX_TXQ_THRESHOLD (EFX_TXQ_MASK / 2u)
/* We want to be able to nest calls to netif_stop_queue(), since each
* channel can have an individual stop on the queue.
@@ -125,6 +125,24 @@ static void efx_tsoh_free(struct efx_tx_queue *tx_queue,
}
+static inline unsigned
+efx_max_tx_len(struct efx_nic *efx, dma_addr_t dma_addr)
+{
+ /* Depending on the NIC revision, we can use descriptor
+ * lengths up to 8K or 8K-1. However, since PCI Express
+ * devices must split read requests at 4K boundaries, there is
+ * little benefit from using descriptors that cross those
+ * boundaries and we keep things simple by not doing so.
+ */
+ unsigned len = (~dma_addr & 0xfff) + 1;
+
+ /* Work around hardware bug for unaligned buffers. */
+ if (EFX_WORKAROUND_5391(efx) && (dma_addr & 0xf))
+ len = min_t(unsigned, len, 512 - (dma_addr & 0xf));
+
+ return len;
+}
+
/*
* Add a socket buffer to a TX queue
*
@@ -135,11 +153,13 @@ static void efx_tsoh_free(struct efx_tx_queue *tx_queue,
* If any DMA mapping fails, any mapped fragments will be unmapped,
* the queue's insert pointer will be restored to its original value.
*
+ * This function is split out from efx_hard_start_xmit to allow the
+ * loopback test to direct packets via specific TX queues.
+ *
* Returns NETDEV_TX_OK or NETDEV_TX_BUSY
* You must hold netif_tx_lock() to call this function.
*/
-static netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue,
- struct sk_buff *skb)
+netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
{
struct efx_nic *efx = tx_queue->efx;
struct pci_dev *pci_dev = efx->pci_dev;
@@ -147,7 +167,7 @@ static netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue,
skb_frag_t *fragment;
struct page *page;
int page_offset;
- unsigned int len, unmap_len = 0, fill_level, insert_ptr, misalign;
+ unsigned int len, unmap_len = 0, fill_level, insert_ptr;
dma_addr_t dma_addr, unmap_addr = 0;
unsigned int dma_len;
bool unmap_single;
@@ -156,7 +176,7 @@ static netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue,
EFX_BUG_ON_PARANOID(tx_queue->write_count != tx_queue->insert_count);
- if (skb_shinfo((struct sk_buff *)skb)->gso_size)
+ if (skb_shinfo(skb)->gso_size)
return efx_enqueue_skb_tso(tx_queue, skb);
/* Get size of the initial fragment */
@@ -171,7 +191,7 @@ static netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue,
}
fill_level = tx_queue->insert_count - tx_queue->old_read_count;
- q_space = efx->type->txd_ring_mask - 1 - fill_level;
+ q_space = EFX_TXQ_MASK - 1 - fill_level;
/* Map for DMA. Use pci_map_single rather than pci_map_page
* since this is more efficient on machines with sparse
@@ -208,16 +228,14 @@ static netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue,
&tx_queue->read_count;
fill_level = (tx_queue->insert_count
- tx_queue->old_read_count);
- q_space = (efx->type->txd_ring_mask - 1 -
- fill_level);
+ q_space = EFX_TXQ_MASK - 1 - fill_level;
if (unlikely(q_space-- <= 0))
goto stop;
smp_mb();
--tx_queue->stopped;
}
- insert_ptr = (tx_queue->insert_count &
- efx->type->txd_ring_mask);
+ insert_ptr = tx_queue->insert_count & EFX_TXQ_MASK;
buffer = &tx_queue->buffer[insert_ptr];
efx_tsoh_free(tx_queue, buffer);
EFX_BUG_ON_PARANOID(buffer->tsoh);
@@ -226,14 +244,10 @@ static netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue,
EFX_BUG_ON_PARANOID(!buffer->continuation);
EFX_BUG_ON_PARANOID(buffer->unmap_len);
- dma_len = (((~dma_addr) & efx->type->tx_dma_mask) + 1);
- if (likely(dma_len > len))
+ dma_len = efx_max_tx_len(efx, dma_addr);
+ if (likely(dma_len >= len))
dma_len = len;
- misalign = (unsigned)dma_addr & efx->type->bug5391_mask;
- if (misalign && dma_len + misalign > 512)
- dma_len = 512 - misalign;
-
/* Fill out per descriptor fields */
buffer->len = dma_len;
buffer->dma_addr = dma_addr;
@@ -266,7 +280,7 @@ static netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue,
buffer->continuation = false;
/* Pass off to hardware */
- falcon_push_buffers(tx_queue);
+ efx_nic_push_buffers(tx_queue);
return NETDEV_TX_OK;
@@ -276,7 +290,7 @@ static netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue,
skb_shinfo(skb)->nr_frags + 1);
/* Mark the packet as transmitted, and free the SKB ourselves */
- dev_kfree_skb_any((struct sk_buff *)skb);
+ dev_kfree_skb_any(skb);
goto unwind;
stop:
@@ -289,7 +303,7 @@ static netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue,
/* Work backwards until we hit the original insert pointer value */
while (tx_queue->insert_count != tx_queue->write_count) {
--tx_queue->insert_count;
- insert_ptr = tx_queue->insert_count & efx->type->txd_ring_mask;
+ insert_ptr = tx_queue->insert_count & EFX_TXQ_MASK;
buffer = &tx_queue->buffer[insert_ptr];
efx_dequeue_buffer(tx_queue, buffer);
buffer->len = 0;
@@ -318,10 +332,9 @@ static void efx_dequeue_buffers(struct efx_tx_queue *tx_queue,
{
struct efx_nic *efx = tx_queue->efx;
unsigned int stop_index, read_ptr;
- unsigned int mask = tx_queue->efx->type->txd_ring_mask;
- stop_index = (index + 1) & mask;
- read_ptr = tx_queue->read_count & mask;
+ stop_index = (index + 1) & EFX_TXQ_MASK;
+ read_ptr = tx_queue->read_count & EFX_TXQ_MASK;
while (read_ptr != stop_index) {
struct efx_tx_buffer *buffer = &tx_queue->buffer[read_ptr];
@@ -338,28 +351,10 @@ static void efx_dequeue_buffers(struct efx_tx_queue *tx_queue,
buffer->len = 0;
++tx_queue->read_count;
- read_ptr = tx_queue->read_count & mask;
+ read_ptr = tx_queue->read_count & EFX_TXQ_MASK;
}
}
-/* Initiate a packet transmission on the specified TX queue.
- * Note that returning anything other than NETDEV_TX_OK will cause the
- * OS to free the skb.
- *
- * This function is split out from efx_hard_start_xmit to allow the
- * loopback test to direct packets via specific TX queues. It is
- * therefore a non-static inline, so as not to penalise performance
- * for non-loopback transmissions.
- *
- * Context: netif_tx_lock held
- */
-inline netdev_tx_t efx_xmit(struct efx_nic *efx,
- struct efx_tx_queue *tx_queue, struct sk_buff *skb)
-{
- /* Map fragments for DMA and add to TX queue */
- return efx_enqueue_skb(tx_queue, skb);
-}
-
/* Initiate a packet transmission. We use one channel per CPU
* (sharing when we have more CPUs than channels). On Falcon, the TX
* completion events will be directed back to the CPU that transmitted
@@ -383,7 +378,7 @@ netdev_tx_t efx_hard_start_xmit(struct sk_buff *skb,
else
tx_queue = &efx->tx_queue[EFX_TX_QUEUE_NO_CSUM];
- return efx_xmit(efx, tx_queue, skb);
+ return efx_enqueue_skb(tx_queue, skb);
}
void efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index)
@@ -391,7 +386,7 @@ void efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index)
unsigned fill_level;
struct efx_nic *efx = tx_queue->efx;
- EFX_BUG_ON_PARANOID(index > efx->type->txd_ring_mask);
+ EFX_BUG_ON_PARANOID(index > EFX_TXQ_MASK);
efx_dequeue_buffers(tx_queue, index);
@@ -401,7 +396,7 @@ void efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index)
smp_mb();
if (unlikely(tx_queue->stopped) && likely(efx->port_enabled)) {
fill_level = tx_queue->insert_count - tx_queue->read_count;
- if (fill_level < EFX_NETDEV_TX_THRESHOLD(tx_queue)) {
+ if (fill_level < EFX_TXQ_THRESHOLD) {
EFX_BUG_ON_PARANOID(!efx_dev_registered(efx));
/* Do this under netif_tx_lock(), to avoid racing
@@ -425,15 +420,15 @@ int efx_probe_tx_queue(struct efx_tx_queue *tx_queue)
EFX_LOG(efx, "creating TX queue %d\n", tx_queue->queue);
/* Allocate software ring */
- txq_size = (efx->type->txd_ring_mask + 1) * sizeof(*tx_queue->buffer);
+ txq_size = EFX_TXQ_SIZE * sizeof(*tx_queue->buffer);
tx_queue->buffer = kzalloc(txq_size, GFP_KERNEL);
if (!tx_queue->buffer)
return -ENOMEM;
- for (i = 0; i <= efx->type->txd_ring_mask; ++i)
+ for (i = 0; i <= EFX_TXQ_MASK; ++i)
tx_queue->buffer[i].continuation = true;
/* Allocate hardware ring */
- rc = falcon_probe_tx(tx_queue);
+ rc = efx_nic_probe_tx(tx_queue);
if (rc)
goto fail;
@@ -456,7 +451,7 @@ void efx_init_tx_queue(struct efx_tx_queue *tx_queue)
BUG_ON(tx_queue->stopped);
/* Set up TX descriptor ring */
- falcon_init_tx(tx_queue);
+ efx_nic_init_tx(tx_queue);
}
void efx_release_tx_buffers(struct efx_tx_queue *tx_queue)
@@ -468,8 +463,7 @@ void efx_release_tx_buffers(struct efx_tx_queue *tx_queue)
/* Free any buffers left in the ring */
while (tx_queue->read_count != tx_queue->write_count) {
- buffer = &tx_queue->buffer[tx_queue->read_count &
- tx_queue->efx->type->txd_ring_mask];
+ buffer = &tx_queue->buffer[tx_queue->read_count & EFX_TXQ_MASK];
efx_dequeue_buffer(tx_queue, buffer);
buffer->continuation = true;
buffer->len = 0;
@@ -483,7 +477,7 @@ void efx_fini_tx_queue(struct efx_tx_queue *tx_queue)
EFX_LOG(tx_queue->efx, "shutting down TX queue %d\n", tx_queue->queue);
/* Flush TX queue, remove descriptor ring */
- falcon_fini_tx(tx_queue);
+ efx_nic_fini_tx(tx_queue);
efx_release_tx_buffers(tx_queue);
@@ -500,7 +494,7 @@ void efx_fini_tx_queue(struct efx_tx_queue *tx_queue)
void efx_remove_tx_queue(struct efx_tx_queue *tx_queue)
{
EFX_LOG(tx_queue->efx, "destroying TX queue %d\n", tx_queue->queue);
- falcon_remove_tx(tx_queue);
+ efx_nic_remove_tx(tx_queue);
kfree(tx_queue->buffer);
tx_queue->buffer = NULL;
@@ -539,6 +533,7 @@ void efx_remove_tx_queue(struct efx_tx_queue *tx_queue)
#define ETH_HDR_LEN(skb) (skb_network_header(skb) - (skb)->data)
#define SKB_TCP_OFF(skb) PTR_DIFF(tcp_hdr(skb), (skb)->data)
#define SKB_IPV4_OFF(skb) PTR_DIFF(ip_hdr(skb), (skb)->data)
+#define SKB_IPV6_OFF(skb) PTR_DIFF(ipv6_hdr(skb), (skb)->data)
/**
* struct tso_state - TSO state for an SKB
@@ -551,6 +546,7 @@ void efx_remove_tx_queue(struct efx_tx_queue *tx_queue)
* @unmap_len: Length of SKB fragment
* @unmap_addr: DMA address of SKB fragment
* @unmap_single: DMA single vs page mapping flag
+ * @protocol: Network protocol (after any VLAN header)
* @header_len: Number of bytes of header
* @full_packet_size: Number of bytes to put in each outgoing segment
*
@@ -571,6 +567,7 @@ struct tso_state {
dma_addr_t unmap_addr;
bool unmap_single;
+ __be16 protocol;
unsigned header_len;
int full_packet_size;
};
@@ -578,9 +575,9 @@ struct tso_state {
/*
* Verify that our various assumptions about sk_buffs and the conditions
- * under which TSO will be attempted hold true.
+ * under which TSO will be attempted hold true. Return the protocol number.
*/
-static void efx_tso_check_safe(struct sk_buff *skb)
+static __be16 efx_tso_check_protocol(struct sk_buff *skb)
{
__be16 protocol = skb->protocol;
@@ -595,13 +592,22 @@ static void efx_tso_check_safe(struct sk_buff *skb)
if (protocol == htons(ETH_P_IP))
skb_set_transport_header(skb, sizeof(*veh) +
4 * ip_hdr(skb)->ihl);
+ else if (protocol == htons(ETH_P_IPV6))
+ skb_set_transport_header(skb, sizeof(*veh) +
+ sizeof(struct ipv6hdr));
}
- EFX_BUG_ON_PARANOID(protocol != htons(ETH_P_IP));
- EFX_BUG_ON_PARANOID(ip_hdr(skb)->protocol != IPPROTO_TCP);
+ if (protocol == htons(ETH_P_IP)) {
+ EFX_BUG_ON_PARANOID(ip_hdr(skb)->protocol != IPPROTO_TCP);
+ } else {
+ EFX_BUG_ON_PARANOID(protocol != htons(ETH_P_IPV6));
+ EFX_BUG_ON_PARANOID(ipv6_hdr(skb)->nexthdr != NEXTHDR_TCP);
+ }
EFX_BUG_ON_PARANOID((PTR_DIFF(tcp_hdr(skb), skb->data)
+ (tcp_hdr(skb)->doff << 2u)) >
skb_headlen(skb));
+
+ return protocol;
}
@@ -708,14 +714,14 @@ static int efx_tx_queue_insert(struct efx_tx_queue *tx_queue,
{
struct efx_tx_buffer *buffer;
struct efx_nic *efx = tx_queue->efx;
- unsigned dma_len, fill_level, insert_ptr, misalign;
+ unsigned dma_len, fill_level, insert_ptr;
int q_space;
EFX_BUG_ON_PARANOID(len <= 0);
fill_level = tx_queue->insert_count - tx_queue->old_read_count;
/* -1 as there is no way to represent all descriptors used */
- q_space = efx->type->txd_ring_mask - 1 - fill_level;
+ q_space = EFX_TXQ_MASK - 1 - fill_level;
while (1) {
if (unlikely(q_space-- <= 0)) {
@@ -731,7 +737,7 @@ static int efx_tx_queue_insert(struct efx_tx_queue *tx_queue,
*(volatile unsigned *)&tx_queue->read_count;
fill_level = (tx_queue->insert_count
- tx_queue->old_read_count);
- q_space = efx->type->txd_ring_mask - 1 - fill_level;
+ q_space = EFX_TXQ_MASK - 1 - fill_level;
if (unlikely(q_space-- <= 0)) {
*final_buffer = NULL;
return 1;
@@ -740,13 +746,13 @@ static int efx_tx_queue_insert(struct efx_tx_queue *tx_queue,
--tx_queue->stopped;
}
- insert_ptr = tx_queue->insert_count & efx->type->txd_ring_mask;
+ insert_ptr = tx_queue->insert_count & EFX_TXQ_MASK;
buffer = &tx_queue->buffer[insert_ptr];
++tx_queue->insert_count;
EFX_BUG_ON_PARANOID(tx_queue->insert_count -
tx_queue->read_count >
- efx->type->txd_ring_mask);
+ EFX_TXQ_MASK);
efx_tsoh_free(tx_queue, buffer);
EFX_BUG_ON_PARANOID(buffer->len);
@@ -757,12 +763,7 @@ static int efx_tx_queue_insert(struct efx_tx_queue *tx_queue,
buffer->dma_addr = dma_addr;
- /* Ensure we do not cross a boundary unsupported by H/W */
- dma_len = (~dma_addr & efx->type->tx_dma_mask) + 1;
-
- misalign = (unsigned)dma_addr & efx->type->bug5391_mask;
- if (misalign && dma_len + misalign > 512)
- dma_len = 512 - misalign;
+ dma_len = efx_max_tx_len(efx, dma_addr);
/* If there is enough space to send then do so */
if (dma_len >= len)
@@ -792,8 +793,7 @@ static void efx_tso_put_header(struct efx_tx_queue *tx_queue,
{
struct efx_tx_buffer *buffer;
- buffer = &tx_queue->buffer[tx_queue->insert_count &
- tx_queue->efx->type->txd_ring_mask];
+ buffer = &tx_queue->buffer[tx_queue->insert_count & EFX_TXQ_MASK];
efx_tsoh_free(tx_queue, buffer);
EFX_BUG_ON_PARANOID(buffer->len);
EFX_BUG_ON_PARANOID(buffer->unmap_len);
@@ -818,7 +818,7 @@ static void efx_enqueue_unwind(struct efx_tx_queue *tx_queue)
while (tx_queue->insert_count != tx_queue->write_count) {
--tx_queue->insert_count;
buffer = &tx_queue->buffer[tx_queue->insert_count &
- tx_queue->efx->type->txd_ring_mask];
+ EFX_TXQ_MASK];
efx_tsoh_free(tx_queue, buffer);
EFX_BUG_ON_PARANOID(buffer->skb);
buffer->len = 0;
@@ -850,7 +850,10 @@ static void tso_start(struct tso_state *st, const struct sk_buff *skb)
+ PTR_DIFF(tcp_hdr(skb), skb->data));
st->full_packet_size = st->header_len + skb_shinfo(skb)->gso_size;
- st->ipv4_id = ntohs(ip_hdr(skb)->id);
+ if (st->protocol == htons(ETH_P_IP))
+ st->ipv4_id = ntohs(ip_hdr(skb)->id);
+ else
+ st->ipv4_id = 0;
st->seqnum = ntohl(tcp_hdr(skb)->seq);
EFX_BUG_ON_PARANOID(tcp_hdr(skb)->urg);
@@ -965,7 +968,6 @@ static int tso_start_new_packet(struct efx_tx_queue *tx_queue,
struct tso_state *st)
{
struct efx_tso_header *tsoh;
- struct iphdr *tsoh_iph;
struct tcphdr *tsoh_th;
unsigned ip_length;
u8 *header;
@@ -989,7 +991,6 @@ static int tso_start_new_packet(struct efx_tx_queue *tx_queue,
header = TSOH_BUFFER(tsoh);
tsoh_th = (struct tcphdr *)(header + SKB_TCP_OFF(skb));
- tsoh_iph = (struct iphdr *)(header + SKB_IPV4_OFF(skb));
/* Copy and update the headers. */
memcpy(header, skb->data, st->header_len);
@@ -1007,11 +1008,22 @@ static int tso_start_new_packet(struct efx_tx_queue *tx_queue,
tsoh_th->fin = tcp_hdr(skb)->fin;
tsoh_th->psh = tcp_hdr(skb)->psh;
}
- tsoh_iph->tot_len = htons(ip_length);
- /* Linux leaves suitable gaps in the IP ID space for us to fill. */
- tsoh_iph->id = htons(st->ipv4_id);
- st->ipv4_id++;
+ if (st->protocol == htons(ETH_P_IP)) {
+ struct iphdr *tsoh_iph =
+ (struct iphdr *)(header + SKB_IPV4_OFF(skb));
+
+ tsoh_iph->tot_len = htons(ip_length);
+
+ /* Linux leaves suitable gaps in the IP ID space for us to fill. */
+ tsoh_iph->id = htons(st->ipv4_id);
+ st->ipv4_id++;
+ } else {
+ struct ipv6hdr *tsoh_iph =
+ (struct ipv6hdr *)(header + SKB_IPV6_OFF(skb));
+
+ tsoh_iph->payload_len = htons(ip_length - sizeof(*tsoh_iph));
+ }
st->packet_space = skb_shinfo(skb)->gso_size;
++tx_queue->tso_packets;
@@ -1041,8 +1053,8 @@ static int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue,
int frag_i, rc, rc2 = NETDEV_TX_OK;
struct tso_state state;
- /* Verify TSO is safe - these checks should never fail. */
- efx_tso_check_safe(skb);
+ /* Find the packet protocol and sanity-check it */
+ state.protocol = efx_tso_check_protocol(skb);
EFX_BUG_ON_PARANOID(tx_queue->write_count != tx_queue->insert_count);
@@ -1092,14 +1104,14 @@ static int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue,
}
/* Pass off to hardware */
- falcon_push_buffers(tx_queue);
+ efx_nic_push_buffers(tx_queue);
tx_queue->tso_bursts++;
return NETDEV_TX_OK;
mem_err:
EFX_ERR(efx, "Out of memory for TSO headers, or PCI mapping error\n");
- dev_kfree_skb_any((struct sk_buff *)skb);
+ dev_kfree_skb_any(skb);
goto unwind;
stop:
@@ -1135,7 +1147,7 @@ static void efx_fini_tso(struct efx_tx_queue *tx_queue)
unsigned i;
if (tx_queue->buffer) {
- for (i = 0; i <= tx_queue->efx->type->txd_ring_mask; ++i)
+ for (i = 0; i <= EFX_TXQ_MASK; ++i)
efx_tsoh_free(tx_queue, &tx_queue->buffer[i]);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-14 04:58:44 +0000