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sfc: remove Software TSO

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It gives no advantage over GSO now that xmit_more exists.  If we find
 ourselves unable to handle a TSO skb (because our TXQ doesn't have a
 TSOv2 context and the NIC doesn't support TSOv1), hand it back to GSO.
 Also do that if the TSO handler fails with EINVAL for any other reason.
As Falcon-architecture NICs don't support any firmware-assisted TSO,
 they no longer advertise TSO feature flags at all.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Edward Cree 2016-11-17 10:52:36 +00:00 committed by David S. Miller
parent e638ee1d0a
commit 46d1efd852
6 changed files with 153 additions and 210 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/net/ethernet/sfc/ef10.c
View File

@ -2158,6 +2158,20 @@ static int efx_ef10_tx_tso_desc(struct efx_tx_queue *tx_queue,
return 0;
}
static u32 efx_ef10_tso_versions(struct efx_nic *efx)
{
struct efx_ef10_nic_data *nic_data = efx->nic_data;
u32 tso_versions = 0;
if (nic_data->datapath_caps &
(1 << MC_CMD_GET_CAPABILITIES_OUT_TX_TSO_LBN))
tso_versions |= BIT(1);
if (nic_data->datapath_caps2 &
(1 << MC_CMD_GET_CAPABILITIES_V2_OUT_TX_TSO_V2_LBN))
tso_versions |= BIT(2);
return tso_versions;
}
static void efx_ef10_tx_init(struct efx_tx_queue *tx_queue)
{
MCDI_DECLARE_BUF(inbuf, MC_CMD_INIT_TXQ_IN_LEN(EFX_MAX_DMAQ_SIZE * 8 /
@ -5759,6 +5773,7 @@ const struct efx_nic_type efx_hunt_a0_nic_type = {
#endif
.get_mac_address = efx_ef10_get_mac_address_pf,
.set_mac_address = efx_ef10_set_mac_address,
.tso_versions = efx_ef10_tso_versions,
.revision = EFX_REV_HUNT_A0,
.max_dma_mask = DMA_BIT_MASK(ESF_DZ_TX_KER_BUF_ADDR_WIDTH),

38
drivers/net/ethernet/sfc/efx.c
View File

@ -3200,23 +3200,6 @@ static int efx_pci_probe(struct pci_dev *pci_dev,
efx = netdev_priv(net_dev);
efx->type = (const struct efx_nic_type *) entry->driver_data;
efx->fixed_features |= NETIF_F_HIGHDMA;
net_dev->features |= (efx->type->offload_features | NETIF_F_SG |
NETIF_F_TSO | NETIF_F_RXCSUM);
if (efx->type->offload_features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM))
net_dev->features |= NETIF_F_TSO6;
/* Mask for features that also apply to VLAN devices */
net_dev->vlan_features |= (NETIF_F_HW_CSUM | NETIF_F_SG |
NETIF_F_HIGHDMA | NETIF_F_ALL_TSO |
NETIF_F_RXCSUM);
net_dev->hw_features = net_dev->features & ~efx->fixed_features;
/* Disable VLAN filtering by default. It may be enforced if
* the feature is fixed (i.e. VLAN filters are required to
* receive VLAN tagged packets due to vPort restrictions).
*/
net_dev->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
net_dev->features |= efx->fixed_features;
pci_set_drvdata(pci_dev, efx);
SET_NETDEV_DEV(net_dev, &pci_dev->dev);
@ -3239,6 +3222,27 @@ static int efx_pci_probe(struct pci_dev *pci_dev,
if (rc)
goto fail3;
net_dev->features |= (efx->type->offload_features | NETIF_F_SG |
NETIF_F_TSO | NETIF_F_RXCSUM);
if (efx->type->offload_features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM))
net_dev->features |= NETIF_F_TSO6;
/* Check whether device supports TSO */
if (!efx->type->tso_versions || !efx->type->tso_versions(efx))
net_dev->features &= ~NETIF_F_ALL_TSO;
/* Mask for features that also apply to VLAN devices */
net_dev->vlan_features |= (NETIF_F_HW_CSUM | NETIF_F_SG |
NETIF_F_HIGHDMA | NETIF_F_ALL_TSO |
NETIF_F_RXCSUM);
net_dev->hw_features = net_dev->features & ~efx->fixed_features;
/* Disable VLAN filtering by default. It may be enforced if
* the feature is fixed (i.e. VLAN filters are required to
* receive VLAN tagged packets due to vPort restrictions).
*/
net_dev->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
net_dev->features |= efx->fixed_features;
rc = efx_register_netdev(efx);
if (rc)
goto fail4;

1
drivers/net/ethernet/sfc/ethtool.c
View File

@ -69,6 +69,7 @@ static const struct efx_sw_stat_desc efx_sw_stat_desc[] = {
EFX_ETHTOOL_UINT_TXQ_STAT(tso_bursts),
EFX_ETHTOOL_UINT_TXQ_STAT(tso_long_headers),
EFX_ETHTOOL_UINT_TXQ_STAT(tso_packets),
EFX_ETHTOOL_UINT_TXQ_STAT(tso_fallbacks),
EFX_ETHTOOL_UINT_TXQ_STAT(pushes),
EFX_ETHTOOL_UINT_TXQ_STAT(pio_packets),
EFX_ETHTOOL_UINT_TXQ_STAT(cb_packets),

5
drivers/net/ethernet/sfc/net_driver.h
View File

@ -225,6 +225,7 @@ struct efx_tx_buffer {
* @tso_long_headers: Number of packets with headers too long for standard
* blocks
* @tso_packets: Number of packets via the TSO xmit path
* @tso_fallbacks: Number of times TSO fallback used
* @pushes: Number of times the TX push feature has been used
* @pio_packets: Number of times the TX PIO feature has been used
* @xmit_more_available: Are any packets waiting to be pushed to the NIC
@ -266,6 +267,7 @@ struct efx_tx_queue {
unsigned int tso_bursts;
unsigned int tso_long_headers;
unsigned int tso_packets;
unsigned int tso_fallbacks;
unsigned int pushes;
unsigned int pio_packets;
bool xmit_more_available;
@ -1225,6 +1227,8 @@ struct efx_mtd_partition {
* and tx_type will already have been validated but this operation
* must validate and update rx_filter.
* @set_mac_address: Set the MAC address of the device
* @tso_versions: Returns mask of firmware-assisted TSO versions supported.
* If %NULL, then device does not support any TSO version.
* @revision: Hardware architecture revision
* @txd_ptr_tbl_base: TX descriptor ring base address
* @rxd_ptr_tbl_base: RX descriptor ring base address
@ -1381,6 +1385,7 @@ struct efx_nic_type {
void (*vswitching_remove)(struct efx_nic *efx);
int (*get_mac_address)(struct efx_nic *efx, unsigned char *perm_addr);
int (*set_mac_address)(struct efx_nic *efx);
u32 (*tso_versions)(struct efx_nic *efx);
int revision;
unsigned int txd_ptr_tbl_base;

46
drivers/net/ethernet/sfc/tx.c
View File

@ -446,10 +446,38 @@ static void efx_enqueue_unwind(struct efx_tx_queue *tx_queue)
}
}
static int efx_tx_tso_sw(struct efx_tx_queue *tx_queue, struct sk_buff *skb,
bool *data_mapped)
/*
* Fallback to software TSO.
*
* This is used if we are unable to send a GSO packet through hardware TSO.
* This should only ever happen due to per-queue restrictions - unsupported
* packets should first be filtered by the feature flags.
*
* Returns 0 on success, error code otherwise.
*/
static int efx_tx_tso_fallback(struct efx_tx_queue *tx_queue,
struct sk_buff *skb)
{
return efx_enqueue_skb_tso(tx_queue, skb, data_mapped);
struct sk_buff *segments, *next;
segments = skb_gso_segment(skb, 0);
if (IS_ERR(segments))
return PTR_ERR(segments);
dev_kfree_skb_any(skb);
skb = segments;
while (skb) {
next = skb->next;
skb->next = NULL;
if (next)
skb->xmit_more = true;
efx_enqueue_skb(tx_queue, skb);
skb = next;
}
return 0;
}
/*
@ -473,6 +501,7 @@ netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
bool data_mapped = false;
unsigned int segments;
unsigned int skb_len;
int rc;
skb_len = skb->len;
segments = skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 0;
@ -485,7 +514,14 @@ netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
*/
if (segments) {
EFX_BUG_ON_PARANOID(!tx_queue->handle_tso);
if (tx_queue->handle_tso(tx_queue, skb, &data_mapped))
rc = tx_queue->handle_tso(tx_queue, skb, &data_mapped);
if (rc == -EINVAL) {
rc = efx_tx_tso_fallback(tx_queue, skb);
tx_queue->tso_fallbacks++;
if (rc == 0)
return 0;
}
if (rc)
goto err;
#ifdef EFX_USE_PIO
} else if (skb_len <= efx_piobuf_size && !skb->xmit_more &&
@ -801,7 +837,7 @@ void efx_init_tx_queue(struct efx_tx_queue *tx_queue)
/* Set up default function pointers. These may get replaced by
* efx_nic_init_tx() based off NIC/queue capabilities.
*/
tx_queue->handle_tso = efx_tx_tso_sw;
tx_queue->handle_tso = efx_enqueue_skb_tso;
/* Some older hardware requires Tx writes larger than 32. */
tx_queue->tx_min_size = EFX_WORKAROUND_15592(efx) ? 33 : 0;

258
drivers/net/ethernet/sfc/tx_tso.c
View File

@ -29,8 +29,7 @@
/* Efx legacy TCP segmentation acceleration.
*
* Why? Because by doing it here in the driver we can go significantly
* faster than the GSO.
* Utilises firmware support to go faster than GSO (but not as fast as TSOv2).
*
* Requires TX checksum offload support.
*/
@ -47,15 +46,13 @@
* @in_len: Remaining length in current SKB fragment
* @unmap_len: Length of SKB fragment
* @unmap_addr: DMA address of SKB fragment
* @dma_flags: TX buffer flags for DMA mapping - %EFX_TX_BUF_MAP_SINGLE or 0
* @protocol: Network protocol (after any VLAN header)
* @ip_off: Offset of IP header
* @tcp_off: Offset of TCP header
* @header_len: Number of bytes of header
* @ip_base_len: IPv4 tot_len or IPv6 payload_len, before TCP payload
* @header_dma_addr: Header DMA address, when using option descriptors
* @header_unmap_len: Header DMA mapped length, or 0 if not using option
* descriptors
* @header_dma_addr: Header DMA address
* @header_unmap_len: Header DMA mapped length
*
* The state used during segmentation. It is put into this data structure
* just to make it easy to pass into inline functions.
@ -72,7 +69,6 @@ struct tso_state {
unsigned int in_len;
unsigned int unmap_len;
dma_addr_t unmap_addr;
unsigned short dma_flags;
__be16 protocol;
unsigned int ip_off;
@ -172,63 +168,6 @@ static __be16 efx_tso_check_protocol(struct sk_buff *skb)
return protocol;
}
static u8 *efx_tsoh_get_buffer(struct efx_tx_queue *tx_queue,
struct efx_tx_buffer *buffer, unsigned int len)
{
u8 *result;
EFX_BUG_ON_PARANOID(buffer->len);
EFX_BUG_ON_PARANOID(buffer->flags);
EFX_BUG_ON_PARANOID(buffer->unmap_len);
result = efx_tx_get_copy_buffer_limited(tx_queue, buffer, len);
if (result) {
buffer->flags = EFX_TX_BUF_CONT;
} else {
buffer->heap_buf = kmalloc(NET_IP_ALIGN + len, GFP_ATOMIC);
if (unlikely(!buffer->heap_buf))
return NULL;
tx_queue->tso_long_headers++;
result = (u8 *)buffer->heap_buf + NET_IP_ALIGN;
buffer->flags = EFX_TX_BUF_CONT | EFX_TX_BUF_HEAP;
}
buffer->len = len;
return result;
}
/*
* Put a TSO header into the TX queue.
*
* This is special-cased because we know that it is small enough to fit in
* a single fragment, and we know it doesn't cross a page boundary. It
* also allows us to not worry about end-of-packet etc.
*/
static int efx_tso_put_header(struct efx_tx_queue *tx_queue,
struct efx_tx_buffer *buffer, u8 *header)
{
if (unlikely(buffer->flags & EFX_TX_BUF_HEAP)) {
buffer->dma_addr = dma_map_single(&tx_queue->efx->pci_dev->dev,
header, buffer->len,
DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(&tx_queue->efx->pci_dev->dev,
buffer->dma_addr))) {
kfree(buffer->heap_buf);
buffer->len = 0;
buffer->flags = 0;
return -ENOMEM;
}
buffer->unmap_len = buffer->len;
buffer->dma_offset = 0;
buffer->flags |= EFX_TX_BUF_MAP_SINGLE;
}
++tx_queue->insert_count;
return 0;
}
/* Parse the SKB header and initialise state. */
static int tso_start(struct tso_state *st, struct efx_nic *efx,
@ -237,12 +176,8 @@ static int tso_start(struct tso_state *st, struct efx_nic *efx,
{
struct device *dma_dev = &efx->pci_dev->dev;
unsigned int header_len, in_len;
bool use_opt_desc = false;
dma_addr_t dma_addr;
if (tx_queue->tso_version == 1)
use_opt_desc = true;
st->ip_off = skb_network_header(skb) - skb->data;
st->tcp_off = skb_transport_header(skb) - skb->data;
header_len = st->tcp_off + (tcp_hdr(skb)->doff << 2u);
@ -264,30 +199,12 @@ static int tso_start(struct tso_state *st, struct efx_nic *efx,
st->out_len = skb->len - header_len;
if (!use_opt_desc) {
st->header_unmap_len = 0;
if (likely(in_len == 0)) {
st->dma_flags = 0;
st->unmap_len = 0;
return 0;
}
dma_addr = dma_map_single(dma_dev, skb->data + header_len,
in_len, DMA_TO_DEVICE);
st->dma_flags = EFX_TX_BUF_MAP_SINGLE;
st->dma_addr = dma_addr;
st->unmap_addr = dma_addr;
st->unmap_len = in_len;
} else {
dma_addr = dma_map_single(dma_dev, skb->data,
skb_headlen(skb), DMA_TO_DEVICE);
st->header_dma_addr = dma_addr;
st->header_unmap_len = skb_headlen(skb);
st->dma_flags = 0;
st->dma_addr = dma_addr + header_len;
st->unmap_len = 0;
}
dma_addr = dma_map_single(dma_dev, skb->data,
skb_headlen(skb), DMA_TO_DEVICE);
st->header_dma_addr = dma_addr;
st->header_unmap_len = skb_headlen(skb);
st->dma_addr = dma_addr + header_len;
st->unmap_len = 0;
return unlikely(dma_mapping_error(dma_dev, dma_addr)) ? -ENOMEM : 0;
}
@ -298,7 +215,6 @@ static int tso_get_fragment(struct tso_state *st, struct efx_nic *efx,
st->unmap_addr = skb_frag_dma_map(&efx->pci_dev->dev, frag, 0,
skb_frag_size(frag), DMA_TO_DEVICE);
if (likely(!dma_mapping_error(&efx->pci_dev->dev, st->unmap_addr))) {
st->dma_flags = 0;
st->unmap_len = skb_frag_size(frag);
st->in_len = skb_frag_size(frag);
st->dma_addr = st->unmap_addr;
@ -352,7 +268,6 @@ static void tso_fill_packet_with_fragment(struct efx_tx_queue *tx_queue,
/* Transfer ownership of the DMA mapping */
buffer->unmap_len = st->unmap_len;
buffer->dma_offset = buffer->unmap_len - buffer->len;
buffer->flags |= st->dma_flags;
st->unmap_len = 0;
}
@ -369,7 +284,7 @@ static void tso_fill_packet_with_fragment(struct efx_tx_queue *tx_queue,
* @st: TSO state
*
* Generate a new header and prepare for the new packet. Return 0 on
* success, or -%ENOMEM if failed to alloc header.
* success, or -%ENOMEM if failed to alloc header, or other negative error.
*/
static int tso_start_new_packet(struct efx_tx_queue *tx_queue,
const struct sk_buff *skb,
@ -378,7 +293,7 @@ static int tso_start_new_packet(struct efx_tx_queue *tx_queue,
struct efx_tx_buffer *buffer =
efx_tx_queue_get_insert_buffer(tx_queue);
bool is_last = st->out_len <= skb_shinfo(skb)->gso_size;
u8 tcp_flags_mask;
u8 tcp_flags_mask, tcp_flags;
if (!is_last) {
st->packet_space = skb_shinfo(skb)->gso_size;
@ -388,82 +303,44 @@ static int tso_start_new_packet(struct efx_tx_queue *tx_queue,
tcp_flags_mask = 0x00;
}
if (!st->header_unmap_len) {
/* Allocate and insert a DMA-mapped header buffer. */
struct tcphdr *tsoh_th;
unsigned int ip_length;
u8 *header;
int rc;
if (WARN_ON(!st->header_unmap_len))
return -EINVAL;
/* Send the original headers with a TSO option descriptor
* in front
*/
tcp_flags = ((u8 *)tcp_hdr(skb))[TCP_FLAGS_OFFSET] & ~tcp_flags_mask;
header = efx_tsoh_get_buffer(tx_queue, buffer, st->header_len);
if (!header)
return -ENOMEM;
buffer->flags = EFX_TX_BUF_OPTION;
buffer->len = 0;
buffer->unmap_len = 0;
EFX_POPULATE_QWORD_5(buffer->option,
ESF_DZ_TX_DESC_IS_OPT, 1,
ESF_DZ_TX_OPTION_TYPE,
ESE_DZ_TX_OPTION_DESC_TSO,
ESF_DZ_TX_TSO_TCP_FLAGS, tcp_flags,
ESF_DZ_TX_TSO_IP_ID, st->ipv4_id,
ESF_DZ_TX_TSO_TCP_SEQNO, st->seqnum);
++tx_queue->insert_count;
tsoh_th = (struct tcphdr *)(header + st->tcp_off);
/* Copy and update the headers. */
memcpy(header, skb->data, st->header_len);
tsoh_th->seq = htonl(st->seqnum);
((u8 *)tsoh_th)[TCP_FLAGS_OFFSET] &= ~tcp_flags_mask;
ip_length = st->ip_base_len + st->packet_space;
if (st->protocol == htons(ETH_P_IP)) {
struct iphdr *tsoh_iph =
(struct iphdr *)(header + st->ip_off);
tsoh_iph->tot_len = htons(ip_length);
tsoh_iph->id = htons(st->ipv4_id);
} else {
struct ipv6hdr *tsoh_iph =
(struct ipv6hdr *)(header + st->ip_off);
tsoh_iph->payload_len = htons(ip_length);
}
rc = efx_tso_put_header(tx_queue, buffer, header);
if (unlikely(rc))
return rc;
/* We mapped the headers in tso_start(). Unmap them
* when the last segment is completed.
*/
buffer = efx_tx_queue_get_insert_buffer(tx_queue);
buffer->dma_addr = st->header_dma_addr;
buffer->len = st->header_len;
if (is_last) {
buffer->flags = EFX_TX_BUF_CONT | EFX_TX_BUF_MAP_SINGLE;
buffer->unmap_len = st->header_unmap_len;
buffer->dma_offset = 0;
/* Ensure we only unmap them once in case of a
* later DMA mapping error and rollback
*/
st->header_unmap_len = 0;
} else {
/* Send the original headers with a TSO option descriptor
* in front
*/
u8 tcp_flags = ((u8 *)tcp_hdr(skb))[TCP_FLAGS_OFFSET] &
~tcp_flags_mask;
buffer->flags = EFX_TX_BUF_OPTION;
buffer->len = 0;
buffer->flags = EFX_TX_BUF_CONT;
buffer->unmap_len = 0;
EFX_POPULATE_QWORD_5(buffer->option,
ESF_DZ_TX_DESC_IS_OPT, 1,
ESF_DZ_TX_OPTION_TYPE,
ESE_DZ_TX_OPTION_DESC_TSO,
ESF_DZ_TX_TSO_TCP_FLAGS, tcp_flags,
ESF_DZ_TX_TSO_IP_ID, st->ipv4_id,
ESF_DZ_TX_TSO_TCP_SEQNO, st->seqnum);
++tx_queue->insert_count;
/* We mapped the headers in tso_start(). Unmap them
* when the last segment is completed.
*/
buffer = efx_tx_queue_get_insert_buffer(tx_queue);
buffer->dma_addr = st->header_dma_addr;
buffer->len = st->header_len;
if (is_last) {
buffer->flags = EFX_TX_BUF_CONT | EFX_TX_BUF_MAP_SINGLE;
buffer->unmap_len = st->header_unmap_len;
buffer->dma_offset = 0;
/* Ensure we only unmap them once in case of a
* later DMA mapping error and rollback
*/
st->header_unmap_len = 0;
} else {
buffer->flags = EFX_TX_BUF_CONT;
buffer->unmap_len = 0;
}
++tx_queue->insert_count;
}
++tx_queue->insert_count;
st->seqnum += skb_shinfo(skb)->gso_size;
@ -483,8 +360,8 @@ static int tso_start_new_packet(struct efx_tx_queue *tx_queue,
* Context: You must hold netif_tx_lock() to call this function.
*
* Add socket buffer @skb to @tx_queue, doing TSO or return != 0 if
* @skb was not enqueued. In all cases @skb is consumed. Return
* %NETDEV_TX_OK.
* @skb was not enqueued. @skb is consumed unless return value is
* %EINVAL.
*/
int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue,
struct sk_buff *skb,
@ -494,6 +371,9 @@ int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue,
int frag_i, rc;
struct tso_state state;
if (tx_queue->tso_version != 1)
return -EINVAL;
prefetch(skb->data);
/* Find the packet protocol and sanity-check it */
@ -503,7 +383,7 @@ int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue,
rc = tso_start(&state, efx, tx_queue, skb);
if (rc)
goto mem_err;
goto fail;
if (likely(state.in_len == 0)) {
/* Grab the first payload fragment. */
@ -512,14 +392,15 @@ int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue,
rc = tso_get_fragment(&state, efx,
skb_shinfo(skb)->frags + frag_i);
if (rc)
goto mem_err;
goto fail;
} else {
/* Payload starts in the header area. */
frag_i = -1;
}
if (tso_start_new_packet(tx_queue, skb, &state) < 0)
goto mem_err;
rc = tso_start_new_packet(tx_queue, skb, &state);
if (rc)
goto fail;
prefetch_ptr(tx_queue);
@ -534,37 +415,38 @@ int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue,
rc = tso_get_fragment(&state, efx,
skb_shinfo(skb)->frags + frag_i);
if (rc)
goto mem_err;
goto fail;
}
/* Start at new packet? */
if (state.packet_space == 0 &&
tso_start_new_packet(tx_queue, skb, &state) < 0)
goto mem_err;
if (state.packet_space == 0) {
rc = tso_start_new_packet(tx_queue, skb, &state);
if (rc)
goto fail;
}
}
*data_mapped = true;
return 0;
mem_err:
netif_err(efx, tx_err, efx->net_dev,
"Out of memory for TSO headers, or DMA mapping error\n");
fail:
if (rc == -ENOMEM)
netif_err(efx, tx_err, efx->net_dev,
"Out of memory for TSO headers, or DMA mapping error\n");
else
netif_err(efx, tx_err, efx->net_dev, "TSO failed, rc = %d\n", rc);
/* Free the DMA mapping we were in the process of writing out */
if (state.unmap_len) {
if (state.dma_flags & EFX_TX_BUF_MAP_SINGLE)
dma_unmap_single(&efx->pci_dev->dev, state.unmap_addr,
state.unmap_len, DMA_TO_DEVICE);
else
dma_unmap_page(&efx->pci_dev->dev, state.unmap_addr,
state.unmap_len, DMA_TO_DEVICE);
dma_unmap_page(&efx->pci_dev->dev, state.unmap_addr,
state.unmap_len, DMA_TO_DEVICE);
}
/* Free the header DMA mapping, if using option descriptors */
/* Free the header DMA mapping */
if (state.header_unmap_len)
dma_unmap_single(&efx->pci_dev->dev, state.header_dma_addr,
state.header_unmap_len, DMA_TO_DEVICE);
return -ENOMEM;
return rc;
}