@@ -18,3 +18,13 @@ config CRYPTO_DEV_CHELSIO
To compile this driver as a module, choose M here: the module
will be called chcr.
+
+config CHELSIO_IPSEC_INLINE
+ bool "Chelsio IPSec XFRM Tx crypto offload"
+ depends on CHELSIO_T4
+ depends on CRYPTO_DEV_CHELSIO
+ depends on XFRM_OFFLOAD
+ depends on INET_ESP_OFFLOAD || INET6_ESP_OFFLOAD
+ default n
+ ---help---
+ Enable support for IPSec Tx Inline.
@@ -2,3 +2,4 @@ ccflags-y := -Idrivers/net/ethernet/chelsio/cxgb4
obj-$(CONFIG_CRYPTO_DEV_CHELSIO) += chcr.o
chcr-objs := chcr_core.o chcr_algo.o
+chcr-$(CONFIG_CHELSIO_IPSEC_INLINE) += chcr_ipsec.o
@@ -73,6 +73,25 @@
#define IV AES_BLOCK_SIZE
+unsigned int sgl_ent_len[] = {0, 0, 16, 24, 40, 48, 64, 72, 88,
+ 96, 112, 120, 136, 144, 160, 168, 184,
+ 192, 208, 216, 232, 240, 256, 264, 280,
+ 288, 304, 312, 328, 336, 352, 360, 376};
+
+unsigned int dsgl_ent_len[] = {0, 32, 32, 48, 48, 64, 64, 80, 80,
+ 112, 112, 128, 128, 144, 144, 160, 160,
+ 192, 192, 208, 208, 224, 224, 240, 240,
+ 272, 272, 288, 288, 304, 304, 320, 320};
+
+static u32 round_constant[11] = {
+ 0x01000000, 0x02000000, 0x04000000, 0x08000000,
+ 0x10000000, 0x20000000, 0x40000000, 0x80000000,
+ 0x1B000000, 0x36000000, 0x6C000000
+};
+
+static int chcr_handle_cipher_resp(struct ablkcipher_request *req,
+ unsigned char *input, int err);
+
static inline struct chcr_aead_ctx *AEAD_CTX(struct chcr_context *ctx)
{
return ctx->crypto_ctx->aeadctx;
@@ -108,18 +127,6 @@ static inline int is_ofld_imm(const struct sk_buff *skb)
return (skb->len <= SGE_MAX_WR_LEN);
}
-/*
- * sgl_len - calculates the size of an SGL of the given capacity
- * @n: the number of SGL entries
- * Calculates the number of flits needed for a scatter/gather list that
- * can hold the given number of entries.
- */
-static inline unsigned int sgl_len(unsigned int n)
-{
- n--;
- return (3 * n) / 2 + (n & 1) + 2;
-}
-
static int sg_nents_xlen(struct scatterlist *sg, unsigned int reqlen,
unsigned int entlen,
unsigned int skip)
@@ -183,30 +190,17 @@ static inline void chcr_handle_ahash_resp(struct ahash_request *req,
}
out:
req->base.complete(&req->base, err);
+}
- }
-
-static inline void chcr_handle_aead_resp(struct aead_request *req,
- unsigned char *input,
- int err)
+static inline int get_aead_subtype(struct crypto_aead *aead)
{
- struct chcr_aead_reqctx *reqctx = aead_request_ctx(req);
- struct crypto_aead *tfm = crypto_aead_reqtfm(req);
- struct uld_ctx *u_ctx = ULD_CTX(a_ctx(tfm));
-
-
- chcr_aead_dma_unmap(&u_ctx->lldi.pdev->dev, req, reqctx->op);
- if (reqctx->b0_dma)
- dma_unmap_single(&u_ctx->lldi.pdev->dev, reqctx->b0_dma,
- reqctx->b0_len, DMA_BIDIRECTIONAL);
- if (reqctx->verify == VERIFY_SW) {
- chcr_verify_tag(req, input, &err);
- reqctx->verify = VERIFY_HW;
+ struct aead_alg *alg = crypto_aead_alg(aead);
+ struct chcr_alg_template *chcr_crypto_alg =
+ container_of(alg, struct chcr_alg_template, alg.aead);
+ return chcr_crypto_alg->type & CRYPTO_ALG_SUB_TYPE_MASK;
}
- req->base.complete(&req->base, err);
-}
-static void chcr_verify_tag(struct aead_request *req, u8 *input, int *err)
+void chcr_verify_tag(struct aead_request *req, u8 *input, int *err)
{
u8 temp[SHA512_DIGEST_SIZE];
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
@@ -231,6 +225,25 @@ static void chcr_verify_tag(struct aead_request *req, u8 *input, int *err)
*err = 0;
}
+static inline void chcr_handle_aead_resp(struct aead_request *req,
+ unsigned char *input,
+ int err)
+{
+ struct chcr_aead_reqctx *reqctx = aead_request_ctx(req);
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct uld_ctx *u_ctx = ULD_CTX(a_ctx(tfm));
+
+ chcr_aead_dma_unmap(&u_ctx->lldi.pdev->dev, req, reqctx->op);
+ if (reqctx->b0_dma)
+ dma_unmap_single(&u_ctx->lldi.pdev->dev, reqctx->b0_dma,
+ reqctx->b0_len, DMA_BIDIRECTIONAL);
+ if (reqctx->verify == VERIFY_SW) {
+ chcr_verify_tag(req, input, &err);
+ reqctx->verify = VERIFY_HW;
+ }
+ req->base.complete(&req->base, err);
+}
+
/*
* chcr_handle_resp - Unmap the DMA buffers associated with the request
* @req: crypto request
@@ -595,14 +608,6 @@ static void ulptx_walk_add_sg(struct ulptx_walk *walk,
}
}
-static inline int get_aead_subtype(struct crypto_aead *aead)
-{
- struct aead_alg *alg = crypto_aead_alg(aead);
- struct chcr_alg_template *chcr_crypto_alg =
- container_of(alg, struct chcr_alg_template, alg.aead);
- return chcr_crypto_alg->type & CRYPTO_ALG_SUB_TYPE_MASK;
-}
-
static inline int get_cryptoalg_subtype(struct crypto_tfm *tfm)
{
struct crypto_alg *alg = tfm->__crt_alg;
@@ -1101,7 +1106,6 @@ static int chcr_final_cipher_iv(struct ablkcipher_request *req,
}
-
static int chcr_handle_cipher_resp(struct ablkcipher_request *req,
unsigned char *input, int err)
{
@@ -2202,9 +2206,9 @@ static struct sk_buff *create_authenc_wr(struct aead_request *req,
return ERR_PTR(error);
}
-static int chcr_aead_dma_map(struct device *dev,
- struct aead_request *req,
- unsigned short op_type)
+int chcr_aead_dma_map(struct device *dev,
+ struct aead_request *req,
+ unsigned short op_type)
{
int error;
struct chcr_aead_reqctx *reqctx = aead_request_ctx(req);
@@ -2246,9 +2250,9 @@ static int chcr_aead_dma_map(struct device *dev,
return -ENOMEM;
}
-static void chcr_aead_dma_unmap(struct device *dev,
- struct aead_request *req,
- unsigned short op_type)
+void chcr_aead_dma_unmap(struct device *dev,
+ struct aead_request *req,
+ unsigned short op_type)
{
struct chcr_aead_reqctx *reqctx = aead_request_ctx(req);
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
@@ -2273,10 +2277,10 @@ static void chcr_aead_dma_unmap(struct device *dev,
}
}
-static inline void chcr_add_aead_src_ent(struct aead_request *req,
- struct ulptx_sgl *ulptx,
- unsigned int assoclen,
- unsigned short op_type)
+void chcr_add_aead_src_ent(struct aead_request *req,
+ struct ulptx_sgl *ulptx,
+ unsigned int assoclen,
+ unsigned short op_type)
{
struct ulptx_walk ulp_walk;
struct chcr_aead_reqctx *reqctx = aead_request_ctx(req);
@@ -2308,11 +2312,11 @@ static inline void chcr_add_aead_src_ent(struct aead_request *req,
}
}
-static inline void chcr_add_aead_dst_ent(struct aead_request *req,
- struct cpl_rx_phys_dsgl *phys_cpl,
- unsigned int assoclen,
- unsigned short op_type,
- unsigned short qid)
+void chcr_add_aead_dst_ent(struct aead_request *req,
+ struct cpl_rx_phys_dsgl *phys_cpl,
+ unsigned int assoclen,
+ unsigned short op_type,
+ unsigned short qid)
{
struct chcr_aead_reqctx *reqctx = aead_request_ctx(req);
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
@@ -2330,9 +2334,9 @@ static inline void chcr_add_aead_dst_ent(struct aead_request *req,
dsgl_walk_end(&dsgl_walk, qid);
}
-static inline void chcr_add_cipher_src_ent(struct ablkcipher_request *req,
- struct ulptx_sgl *ulptx,
- struct cipher_wr_param *wrparam)
+void chcr_add_cipher_src_ent(struct ablkcipher_request *req,
+ struct ulptx_sgl *ulptx,
+ struct cipher_wr_param *wrparam)
{
struct ulptx_walk ulp_walk;
struct chcr_blkcipher_req_ctx *reqctx = ablkcipher_request_ctx(req);
@@ -2355,10 +2359,10 @@ static inline void chcr_add_cipher_src_ent(struct ablkcipher_request *req,
}
}
-static inline void chcr_add_cipher_dst_ent(struct ablkcipher_request *req,
- struct cpl_rx_phys_dsgl *phys_cpl,
- struct cipher_wr_param *wrparam,
- unsigned short qid)
+void chcr_add_cipher_dst_ent(struct ablkcipher_request *req,
+ struct cpl_rx_phys_dsgl *phys_cpl,
+ struct cipher_wr_param *wrparam,
+ unsigned short qid)
{
struct chcr_blkcipher_req_ctx *reqctx = ablkcipher_request_ctx(req);
struct dsgl_walk dsgl_walk;
@@ -2373,9 +2377,9 @@ static inline void chcr_add_cipher_dst_ent(struct ablkcipher_request *req,
dsgl_walk_end(&dsgl_walk, qid);
}
-static inline void chcr_add_hash_src_ent(struct ahash_request *req,
- struct ulptx_sgl *ulptx,
- struct hash_wr_param *param)
+void chcr_add_hash_src_ent(struct ahash_request *req,
+ struct ulptx_sgl *ulptx,
+ struct hash_wr_param *param)
{
struct ulptx_walk ulp_walk;
struct chcr_ahash_req_ctx *reqctx = ahash_request_ctx(req);
@@ -2402,9 +2406,8 @@ static inline void chcr_add_hash_src_ent(struct ahash_request *req,
}
}
-
-static inline int chcr_hash_dma_map(struct device *dev,
- struct ahash_request *req)
+int chcr_hash_dma_map(struct device *dev,
+ struct ahash_request *req)
{
struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(req);
int error = 0;
@@ -2419,8 +2422,8 @@ static inline int chcr_hash_dma_map(struct device *dev,
return 0;
}
-static inline void chcr_hash_dma_unmap(struct device *dev,
- struct ahash_request *req)
+void chcr_hash_dma_unmap(struct device *dev,
+ struct ahash_request *req)
{
struct chcr_ahash_req_ctx *req_ctx = ahash_request_ctx(req);
@@ -2433,9 +2436,8 @@ static inline void chcr_hash_dma_unmap(struct device *dev,
}
-
-static int chcr_cipher_dma_map(struct device *dev,
- struct ablkcipher_request *req)
+int chcr_cipher_dma_map(struct device *dev,
+ struct ablkcipher_request *req)
{
int error;
struct chcr_blkcipher_req_ctx *reqctx = ablkcipher_request_ctx(req);
@@ -2469,8 +2471,9 @@ static int chcr_cipher_dma_map(struct device *dev,
dma_unmap_single(dev, reqctx->iv_dma, IV, DMA_BIDIRECTIONAL);
return -ENOMEM;
}
-static void chcr_cipher_dma_unmap(struct device *dev,
- struct ablkcipher_request *req)
+
+void chcr_cipher_dma_unmap(struct device *dev,
+ struct ablkcipher_request *req)
{
struct chcr_blkcipher_req_ctx *reqctx = ablkcipher_request_ctx(req);
@@ -3375,6 +3378,40 @@ static int chcr_aead_digest_null_setkey(struct crypto_aead *authenc,
aeadctx->enckey_len = 0;
return -EINVAL;
}
+
+static int chcr_aead_op(struct aead_request *req,
+ unsigned short op_type,
+ int size,
+ create_wr_t create_wr_fn)
+{
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct uld_ctx *u_ctx;
+ struct sk_buff *skb;
+
+ if (!a_ctx(tfm)->dev) {
+ pr_err("chcr : %s : No crypto device.\n", __func__);
+ return -ENXIO;
+ }
+ u_ctx = ULD_CTX(a_ctx(tfm));
+ if (cxgb4_is_crypto_q_full(u_ctx->lldi.ports[0],
+ a_ctx(tfm)->tx_qidx)) {
+ if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
+ return -EBUSY;
+ }
+
+ /* Form a WR from req */
+ skb = create_wr_fn(req, u_ctx->lldi.rxq_ids[a_ctx(tfm)->rx_qidx], size,
+ op_type);
+
+ if (IS_ERR(skb) || !skb)
+ return PTR_ERR(skb);
+
+ skb->dev = u_ctx->lldi.ports[0];
+ set_wr_txq(skb, CPL_PRIORITY_DATA, a_ctx(tfm)->tx_qidx);
+ chcr_send_wr(skb);
+ return -EINPROGRESS;
+}
+
static int chcr_aead_encrypt(struct aead_request *req)
{
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
@@ -3427,38 +3464,6 @@ static int chcr_aead_decrypt(struct aead_request *req)
}
}
-static int chcr_aead_op(struct aead_request *req,
- unsigned short op_type,
- int size,
- create_wr_t create_wr_fn)
-{
- struct crypto_aead *tfm = crypto_aead_reqtfm(req);
- struct uld_ctx *u_ctx;
- struct sk_buff *skb;
-
- if (!a_ctx(tfm)->dev) {
- pr_err("chcr : %s : No crypto device.\n", __func__);
- return -ENXIO;
- }
- u_ctx = ULD_CTX(a_ctx(tfm));
- if (cxgb4_is_crypto_q_full(u_ctx->lldi.ports[0],
- a_ctx(tfm)->tx_qidx)) {
- if (!(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
- return -EBUSY;
- }
-
- /* Form a WR from req */
- skb = create_wr_fn(req, u_ctx->lldi.rxq_ids[a_ctx(tfm)->rx_qidx], size,
- op_type);
-
- if (IS_ERR(skb) || !skb)
- return PTR_ERR(skb);
-
- skb->dev = u_ctx->lldi.ports[0];
- set_wr_txq(skb, CPL_PRIORITY_DATA, a_ctx(tfm)->tx_qidx);
- chcr_send_wr(skb);
- return -EINPROGRESS;
-}
static struct chcr_alg_template driver_algs[] = {
/* AES-CBC */
{
@@ -226,15 +226,6 @@
#define SPACE_LEFT(len) \
((SGE_MAX_WR_LEN - WR_MIN_LEN - (len)))
-unsigned int sgl_ent_len[] = {0, 0, 16, 24, 40, 48, 64, 72, 88,
- 96, 112, 120, 136, 144, 160, 168, 184,
- 192, 208, 216, 232, 240, 256, 264, 280,
- 288, 304, 312, 328, 336, 352, 360, 376};
-unsigned int dsgl_ent_len[] = {0, 32, 32, 48, 48, 64, 64, 80, 80,
- 112, 112, 128, 128, 144, 144, 160, 160,
- 192, 192, 208, 208, 224, 224, 240, 240,
- 272, 272, 288, 288, 304, 304, 320, 320};
-
struct algo_param {
unsigned int auth_mode;
unsigned int mk_size;
@@ -404,10 +395,4 @@ static inline u32 aes_ks_subword(const u32 w)
return *(u32 *)(&bytes[0]);
}
-static u32 round_constant[11] = {
- 0x01000000, 0x02000000, 0x04000000, 0x08000000,
- 0x10000000, 0x20000000, 0x40000000, 0x80000000,
- 0x1B000000, 0x36000000, 0x6C000000
-};
-
#endif /* __CHCR_ALGO_H__ */
@@ -48,6 +48,7 @@
.add = chcr_uld_add,
.state_change = chcr_uld_state_change,
.rx_handler = chcr_uld_rx_handler,
+ .tx_handler = chcr_uld_tx_handler,
};
struct uld_ctx *assign_chcr_device(void)
@@ -164,6 +165,8 @@ static void *chcr_uld_add(const struct cxgb4_lld_info *lld)
goto out;
}
u_ctx->lldi = *lld;
+ if (lld->crypto & ULP_CRYPTO_IPSEC_INLINE)
+ chcr_add_xfrmops(lld);
out:
return u_ctx;
}
@@ -187,6 +190,11 @@ int chcr_uld_rx_handler(void *handle, const __be64 *rsp,
return 0;
}
+int chcr_uld_tx_handler(struct sk_buff *skb, struct net_device *dev)
+{
+ return chcr_ipsec_xmit(skb, dev);
+}
+
static int chcr_uld_state_change(void *handle, enum cxgb4_state state)
{
struct uld_ctx *u_ctx = handle;
@@ -39,6 +39,7 @@
#include <crypto/algapi.h>
#include "t4_hw.h"
#include "cxgb4.h"
+#include "t4_msg.h"
#include "cxgb4_uld.h"
#define DRV_MODULE_NAME "chcr"
@@ -89,12 +90,49 @@ struct uld_ctx {
struct chcr_dev *dev;
};
+struct chcr_ipsec_req {
+ struct ulp_txpkt ulptx;
+ struct ulptx_idata sc_imm;
+ struct cpl_tx_sec_pdu sec_cpl;
+ struct _key_ctx key_ctx;
+};
+
+struct chcr_ipsec_wr {
+ struct fw_ulptx_wr wreq;
+ struct chcr_ipsec_req req;
+};
+
+struct ipsec_sa_entry {
+ int hmac_ctrl;
+ unsigned int enckey_len;
+ unsigned int kctx_len;
+ unsigned int authsize;
+ __be32 key_ctx_hdr;
+ char salt[MAX_SALT];
+ char key[2 * AES_MAX_KEY_SIZE];
+};
+
+/*
+ * sgl_len - calculates the size of an SGL of the given capacity
+ * @n: the number of SGL entries
+ * Calculates the number of flits needed for a scatter/gather list that
+ * can hold the given number of entries.
+ */
+static inline unsigned int sgl_len(unsigned int n)
+{
+ n--;
+ return (3 * n) / 2 + (n & 1) + 2;
+}
+
struct uld_ctx *assign_chcr_device(void);
int chcr_send_wr(struct sk_buff *skb);
int start_crypto(void);
int stop_crypto(void);
int chcr_uld_rx_handler(void *handle, const __be64 *rsp,
const struct pkt_gl *pgl);
+int chcr_uld_tx_handler(struct sk_buff *skb, struct net_device *dev);
int chcr_handle_resp(struct crypto_async_request *req, unsigned char *input,
int err);
+int chcr_ipsec_xmit(struct sk_buff *skb, struct net_device *dev);
+void chcr_add_xfrmops(const struct cxgb4_lld_info *lld);
#endif /* __CHCR_CORE_H__ */
@@ -210,8 +210,6 @@ struct dsgl_walk {
struct phys_sge_pairs *to;
};
-
-
struct chcr_gcm_ctx {
u8 ghash_h[AEAD_H_SIZE];
};
@@ -227,8 +225,6 @@ struct __aead_ctx {
struct chcr_authenc_ctx authenc[0];
};
-
-
struct chcr_aead_ctx {
__be32 key_ctx_hdr;
unsigned int enckey_len;
@@ -240,8 +236,6 @@ struct chcr_aead_ctx {
struct __aead_ctx ctx[0];
};
-
-
struct hmac_ctx {
struct crypto_shash *base_hash;
u8 ipad[CHCR_HASH_MAX_BLOCK_SIZE_128];
@@ -307,44 +301,29 @@ struct chcr_alg_template {
int size,
unsigned short op_type);
-static int chcr_aead_op(struct aead_request *req_base,
- unsigned short op_type,
- int size,
- create_wr_t create_wr_fn);
-static inline int get_aead_subtype(struct crypto_aead *aead);
-static int chcr_handle_cipher_resp(struct ablkcipher_request *req,
- unsigned char *input, int err);
-static void chcr_verify_tag(struct aead_request *req, u8 *input, int *err);
-static int chcr_aead_dma_map(struct device *dev, struct aead_request *req,
- unsigned short op_type);
-static void chcr_aead_dma_unmap(struct device *dev, struct aead_request
- *req, unsigned short op_type);
-static inline void chcr_add_aead_dst_ent(struct aead_request *req,
- struct cpl_rx_phys_dsgl *phys_cpl,
- unsigned int assoclen,
- unsigned short op_type,
- unsigned short qid);
-static inline void chcr_add_aead_src_ent(struct aead_request *req,
- struct ulptx_sgl *ulptx,
- unsigned int assoclen,
- unsigned short op_type);
-static inline void chcr_add_cipher_src_ent(struct ablkcipher_request *req,
- struct ulptx_sgl *ulptx,
- struct cipher_wr_param *wrparam);
-static int chcr_cipher_dma_map(struct device *dev,
- struct ablkcipher_request *req);
-static void chcr_cipher_dma_unmap(struct device *dev,
- struct ablkcipher_request *req);
-static inline void chcr_add_cipher_dst_ent(struct ablkcipher_request *req,
- struct cpl_rx_phys_dsgl *phys_cpl,
- struct cipher_wr_param *wrparam,
- unsigned short qid);
+void chcr_verify_tag(struct aead_request *req, u8 *input, int *err);
+int chcr_aead_dma_map(struct device *dev, struct aead_request *req,
+ unsigned short op_type);
+void chcr_aead_dma_unmap(struct device *dev, struct aead_request *req,
+ unsigned short op_type);
+void chcr_add_aead_dst_ent(struct aead_request *req,
+ struct cpl_rx_phys_dsgl *phys_cpl,
+ unsigned int assoclen, unsigned short op_type,
+ unsigned short qid);
+void chcr_add_aead_src_ent(struct aead_request *req, struct ulptx_sgl *ulptx,
+ unsigned int assoclen, unsigned short op_type);
+void chcr_add_cipher_src_ent(struct ablkcipher_request *req,
+ struct ulptx_sgl *ulptx,
+ struct cipher_wr_param *wrparam);
+int chcr_cipher_dma_map(struct device *dev, struct ablkcipher_request *req);
+void chcr_cipher_dma_unmap(struct device *dev, struct ablkcipher_request *req);
+void chcr_add_cipher_dst_ent(struct ablkcipher_request *req,
+ struct cpl_rx_phys_dsgl *phys_cpl,
+ struct cipher_wr_param *wrparam,
+ unsigned short qid);
int sg_nents_len_skip(struct scatterlist *sg, u64 len, u64 skip);
-static inline void chcr_add_hash_src_ent(struct ahash_request *req,
- struct ulptx_sgl *ulptx,
- struct hash_wr_param *param);
-static inline int chcr_hash_dma_map(struct device *dev,
- struct ahash_request *req);
-static inline void chcr_hash_dma_unmap(struct device *dev,
- struct ahash_request *req);
+void chcr_add_hash_src_ent(struct ahash_request *req, struct ulptx_sgl *ulptx,
+ struct hash_wr_param *param);
+int chcr_hash_dma_map(struct device *dev, struct ahash_request *req);
+void chcr_hash_dma_unmap(struct device *dev, struct ahash_request *req);
#endif /* __CHCR_CRYPTO_H__ */
new file mode 100644
@@ -0,0 +1,659 @@
+/*
+ * This file is part of the Chelsio T6 Crypto driver for Linux.
+ *
+ * Copyright (c) 2003-2017 Chelsio Communications, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Written and Maintained by:
+ * Atul Gupta (atul.gupta@chelsio.com)
+ */
+
+#define pr_fmt(fmt) "chcr:" fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/crypto.h>
+#include <linux/cryptohash.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/highmem.h>
+#include <linux/if_vlan.h>
+#include <linux/ip.h>
+#include <linux/netdevice.h>
+#include <net/esp.h>
+#include <net/xfrm.h>
+#include <crypto/aes.h>
+#include <crypto/algapi.h>
+#include <crypto/hash.h>
+#include <crypto/sha.h>
+#include <crypto/authenc.h>
+#include <crypto/internal/aead.h>
+#include <crypto/null.h>
+#include <crypto/internal/skcipher.h>
+#include <crypto/aead.h>
+#include <crypto/scatterwalk.h>
+#include <crypto/internal/hash.h>
+
+#include "chcr_core.h"
+#include "chcr_algo.h"
+#include "chcr_crypto.h"
+
+/*
+ * Max Tx descriptor space we allow for an Ethernet packet to be inlined
+ * into a WR.
+ */
+#define MAX_IMM_TX_PKT_LEN 256
+#define GCM_ESP_IV_SIZE 8
+
+static int chcr_xfrm_add_state(struct xfrm_state *x);
+static void chcr_xfrm_del_state(struct xfrm_state *x);
+static void chcr_xfrm_free_state(struct xfrm_state *x);
+static bool chcr_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *x);
+
+static const struct xfrmdev_ops chcr_xfrmdev_ops = {
+ .xdo_dev_state_add = chcr_xfrm_add_state,
+ .xdo_dev_state_delete = chcr_xfrm_del_state,
+ .xdo_dev_state_free = chcr_xfrm_free_state,
+ .xdo_dev_offload_ok = chcr_ipsec_offload_ok,
+};
+
+/* Add offload xfrms to Chelsio Interface */
+void chcr_add_xfrmops(const struct cxgb4_lld_info *lld)
+{
+ struct net_device *netdev = NULL;
+ int i;
+
+ for (i = 0; i < lld->nports; i++) {
+ netdev = lld->ports[i];
+ if (!netdev)
+ continue;
+ netdev->xfrmdev_ops = &chcr_xfrmdev_ops;
+ netdev->hw_enc_features |= NETIF_F_HW_ESP;
+ netdev->features |= NETIF_F_HW_ESP;
+ rtnl_lock();
+ netdev_change_features(netdev);
+ rtnl_unlock();
+ }
+}
+
+static inline int chcr_ipsec_setauthsize(struct xfrm_state *x,
+ struct ipsec_sa_entry *sa_entry)
+{
+ int hmac_ctrl;
+ int authsize = x->aead->alg_icv_len / 8;
+
+ sa_entry->authsize = authsize;
+
+ switch (authsize) {
+ case ICV_8:
+ hmac_ctrl = CHCR_SCMD_HMAC_CTRL_DIV2;
+ break;
+ case ICV_12:
+ hmac_ctrl = CHCR_SCMD_HMAC_CTRL_IPSEC_96BIT;
+ break;
+ case ICV_16:
+ hmac_ctrl = CHCR_SCMD_HMAC_CTRL_NO_TRUNC;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return hmac_ctrl;
+}
+
+static inline int chcr_ipsec_setkey(struct xfrm_state *x,
+ struct ipsec_sa_entry *sa_entry)
+{
+ struct crypto_cipher *cipher;
+ int keylen = (x->aead->alg_key_len + 7) / 8;
+ unsigned char *key = x->aead->alg_key;
+ int ck_size, key_ctx_size = 0;
+ unsigned char ghash_h[AEAD_H_SIZE];
+ int ret = 0;
+
+ if (keylen > 3) {
+ keylen -= 4; /* nonce/salt is present in the last 4 bytes */
+ memcpy(sa_entry->salt, key + keylen, 4);
+ }
+
+ if (keylen == AES_KEYSIZE_128) {
+ ck_size = CHCR_KEYCTX_CIPHER_KEY_SIZE_128;
+ } else if (keylen == AES_KEYSIZE_192) {
+ ck_size = CHCR_KEYCTX_CIPHER_KEY_SIZE_192;
+ } else if (keylen == AES_KEYSIZE_256) {
+ ck_size = CHCR_KEYCTX_CIPHER_KEY_SIZE_256;
+ } else {
+ pr_err("GCM: Invalid key length %d\n", keylen);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ memcpy(sa_entry->key, key, keylen);
+ sa_entry->enckey_len = keylen;
+ key_ctx_size = sizeof(struct _key_ctx) +
+ ((DIV_ROUND_UP(keylen, 16)) << 4) +
+ AEAD_H_SIZE;
+
+ sa_entry->key_ctx_hdr = FILL_KEY_CTX_HDR(ck_size,
+ CHCR_KEYCTX_MAC_KEY_SIZE_128,
+ 0, 0,
+ key_ctx_size >> 4);
+
+ /* Calculate the H = CIPH(K, 0 repeated 16 times).
+ * It will go in key context
+ */
+ cipher = crypto_alloc_cipher("aes-generic", 0, 0);
+ if (IS_ERR(cipher)) {
+ sa_entry->enckey_len = 0;
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = crypto_cipher_setkey(cipher, key, keylen);
+ if (ret) {
+ sa_entry->enckey_len = 0;
+ goto out1;
+ }
+ memset(ghash_h, 0, AEAD_H_SIZE);
+ crypto_cipher_encrypt_one(cipher, ghash_h, ghash_h);
+ memcpy(sa_entry->key + (DIV_ROUND_UP(sa_entry->enckey_len, 16) *
+ 16), ghash_h, AEAD_H_SIZE);
+ sa_entry->kctx_len = ((DIV_ROUND_UP(sa_entry->enckey_len, 16)) << 4) +
+ AEAD_H_SIZE;
+out1:
+ crypto_free_cipher(cipher);
+out:
+ return ret;
+}
+
+/*
+ * chcr_xfrm_add_state
+ * returns 0 on success, negative error if failed to send message to FPGA
+ * positive error if FPGA returned a bad response
+ */
+static int chcr_xfrm_add_state(struct xfrm_state *x)
+{
+ struct net_device *netdev = x->xso.dev;
+ struct port_info *pi = netdev_priv(netdev);
+ struct ipsec_sa_entry *sa_entry;
+ struct adapter *adap;
+ int res = 0;
+
+ adap = pi->adapter;
+
+ if (x->props.aalgo != SADB_AALG_NONE) {
+ pr_debug("CHCR: Cannot offload authenticated xfrm states\n");
+ return -EINVAL;
+ }
+ if (x->props.calgo != SADB_X_CALG_NONE) {
+ pr_debug("CHCR: Cannot offload compressed xfrm states\n");
+ return -EINVAL;
+ }
+ if (x->props.flags & XFRM_STATE_ESN) {
+ pr_debug("CHCR: Cannot offload ESN xfrm states\n");
+ return -EINVAL;
+ }
+ if (x->props.family != AF_INET &&
+ x->props.family != AF_INET6) {
+ pr_debug("CHCR: Only IPv4/6 xfrm state offloaded\n");
+ return -EINVAL;
+ }
+ if (x->props.mode != XFRM_MODE_TRANSPORT &&
+ x->props.mode != XFRM_MODE_TUNNEL) {
+ pr_debug("CHCR: Only transport and tunnel xfrm offload\n");
+ return -EINVAL;
+ }
+ if (x->id.proto != IPPROTO_ESP) {
+ pr_debug("CHCR: Only ESP xfrm state offloaded\n");
+ return -EINVAL;
+ }
+ if (x->encap) {
+ pr_debug("CHCR: Encapsulated xfrm state not offloaded\n");
+ return -EINVAL;
+ }
+ if (!x->aead) {
+ pr_debug("CHCR: Cannot offload xfrm states without aead\n");
+ return -EINVAL;
+ }
+ if (x->aead->alg_icv_len != 128 &&
+ x->aead->alg_icv_len != 96) {
+ pr_debug("CHCR: Cannot offload xfrm states with AEAD ICV length other than 96b & 128b\n");
+ return -EINVAL;
+ }
+ if ((x->aead->alg_key_len != 128 + 32) &&
+ (x->aead->alg_key_len != 256 + 32)) {
+ pr_debug("CHCR: Cannot offload xfrm states with AEAD key length other than 128/256 bit\n");
+ return -EINVAL;
+ }
+ if (x->tfcpad) {
+ pr_debug("CHCR: Cannot offload xfrm states with tfc padding\n");
+ return -EINVAL;
+ }
+ if (!x->geniv) {
+ pr_debug("CHCR: Cannot offload xfrm states without geniv\n");
+ return -EINVAL;
+ }
+ if (strcmp(x->geniv, "seqiv")) {
+ pr_debug("CHCR: Cannot offload xfrm states with geniv other than seqiv\n");
+ return -EINVAL;
+ }
+
+ sa_entry = kzalloc(sizeof(*sa_entry), GFP_KERNEL);
+ if (!sa_entry) {
+ res = -ENOMEM;
+ goto out;
+ }
+
+ sa_entry->hmac_ctrl = chcr_ipsec_setauthsize(x, sa_entry);
+ chcr_ipsec_setkey(x, sa_entry);
+ x->xso.offload_handle = (unsigned long)sa_entry;
+ try_module_get(THIS_MODULE);
+out:
+ return res;
+}
+
+static void chcr_xfrm_del_state(struct xfrm_state *x)
+{
+ /* do nothing */
+ if (!x->xso.offload_handle)
+ return;
+}
+
+static void chcr_xfrm_free_state(struct xfrm_state *x)
+{
+ struct ipsec_sa_entry *sa_entry;
+
+ if (!x->xso.offload_handle)
+ return;
+
+ sa_entry = (struct ipsec_sa_entry *)x->xso.offload_handle;
+ kfree(sa_entry);
+ module_put(THIS_MODULE);
+}
+
+static bool chcr_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
+{
+ /* Offload with IP options is not supported yet */
+ if (ip_hdr(skb)->ihl > 5)
+ return false;
+
+ return true;
+}
+
+static inline int is_eth_imm(const struct sk_buff *skb, unsigned int kctx_len)
+{
+ int hdrlen = sizeof(struct chcr_ipsec_req) + kctx_len;
+
+ hdrlen += sizeof(struct cpl_tx_pkt);
+ if (skb->len <= MAX_IMM_TX_PKT_LEN - hdrlen)
+ return hdrlen;
+ return 0;
+}
+
+static inline unsigned int calc_tx_sec_flits(const struct sk_buff *skb,
+ unsigned int kctx_len)
+{
+ unsigned int flits;
+ int hdrlen = is_eth_imm(skb, kctx_len);
+
+ /* If the skb is small enough, we can pump it out as a work request
+ * with only immediate data. In that case we just have to have the
+ * TX Packet header plus the skb data in the Work Request.
+ */
+
+ if (hdrlen)
+ return DIV_ROUND_UP(skb->len + hdrlen, sizeof(__be64));
+
+ flits = sgl_len(skb_shinfo(skb)->nr_frags + 1);
+
+ /* Otherwise, we're going to have to construct a Scatter gather list
+ * of the skb body and fragments. We also include the flits necessary
+ * for the TX Packet Work Request and CPL. We always have a firmware
+ * Write Header (incorporated as part of the cpl_tx_pkt_lso and
+ * cpl_tx_pkt structures), followed by either a TX Packet Write CPL
+ * message or, if we're doing a Large Send Offload, an LSO CPL message
+ * with an embedded TX Packet Write CPL message.
+ */
+ flits += (sizeof(struct fw_ulptx_wr) +
+ sizeof(struct chcr_ipsec_req) +
+ kctx_len +
+ sizeof(struct cpl_tx_pkt_core)) / sizeof(__be64);
+ return flits;
+}
+
+inline void *copy_cpltx_pktxt(struct sk_buff *skb,
+ struct net_device *dev,
+ void *pos)
+{
+ struct adapter *adap;
+ struct port_info *pi;
+ struct sge_eth_txq *q;
+ struct cpl_tx_pkt_core *cpl;
+ u64 cntrl;
+ u32 ctrl0, qidx;
+
+ pi = netdev_priv(dev);
+ adap = pi->adapter;
+ qidx = skb->queue_mapping;
+ q = &adap->sge.ethtxq[qidx + pi->first_qset];
+
+ cpl = (struct cpl_tx_pkt_core *)pos;
+
+ if (skb->ip_summed == CHECKSUM_PARTIAL)
+ cntrl = TXPKT_L4CSUM_DIS_F | TXPKT_IPCSUM_DIS_F;
+ ctrl0 = TXPKT_OPCODE_V(CPL_TX_PKT_XT) | TXPKT_INTF_V(pi->tx_chan) |
+ TXPKT_PF_V(adap->pf);
+ if (skb_vlan_tag_present(skb)) {
+ q->vlan_ins++;
+ cntrl |= TXPKT_VLAN_VLD_F | TXPKT_VLAN_V(skb_vlan_tag_get(skb));
+ }
+
+ cpl->ctrl0 = htonl(ctrl0);
+ cpl->pack = htons(0);
+ cpl->len = htons(skb->len);
+ cpl->ctrl1 = cpu_to_be64(cntrl);
+
+ pos += sizeof(struct cpl_tx_pkt_core);
+ return pos;
+}
+
+inline void *copy_key_cpltx_pktxt(struct sk_buff *skb,
+ struct net_device *dev,
+ void *pos,
+ struct ipsec_sa_entry *sa_entry)
+{
+ struct adapter *adap;
+ struct port_info *pi;
+ struct sge_eth_txq *q;
+ unsigned int len, qidx;
+ struct _key_ctx *key_ctx;
+ int left, eoq, key_len;
+
+ pi = netdev_priv(dev);
+ adap = pi->adapter;
+ qidx = skb->queue_mapping;
+ q = &adap->sge.ethtxq[qidx + pi->first_qset];
+ len = sa_entry->enckey_len + sizeof(struct cpl_tx_pkt_core);
+ key_len = sa_entry->kctx_len;
+
+ /* end of queue, reset pos to start of queue */
+ eoq = (void *)q->q.stat - pos;
+ left = eoq;
+ if (!eoq) {
+ pos = q->q.desc;
+ left = 64 * q->q.size;
+ }
+
+ /* Copy the Key context header */
+ key_ctx = (struct _key_ctx *)pos;
+ key_ctx->ctx_hdr = sa_entry->key_ctx_hdr;
+ memcpy(key_ctx->salt, sa_entry->salt, MAX_SALT);
+ pos += sizeof(struct _key_ctx);
+ left -= sizeof(struct _key_ctx);
+
+ if (likely(len <= left)) {
+ memcpy(key_ctx->key, sa_entry->key, key_len);
+ pos += key_len;
+ } else {
+ if (key_len <= left) {
+ memcpy(pos, sa_entry->key, key_len);
+ pos += key_len;
+ } else {
+ memcpy(pos, sa_entry->key, left);
+ memcpy(q->q.desc, sa_entry->key + left,
+ key_len - left);
+ pos = q->q.desc + (key_len - left);
+ }
+ }
+ /* Copy CPL TX PKT XT */
+ pos = copy_cpltx_pktxt(skb, dev, pos);
+
+ return pos;
+}
+
+inline void *chcr_crypto_wreq(struct sk_buff *skb,
+ struct net_device *dev,
+ void *pos,
+ int credits,
+ struct ipsec_sa_entry *sa_entry)
+{
+ struct port_info *pi = netdev_priv(dev);
+ struct adapter *adap = pi->adapter;
+ unsigned int immdatalen = 0;
+ unsigned int ivsize = GCM_ESP_IV_SIZE;
+ struct chcr_ipsec_wr *wr;
+ unsigned int flits;
+ u32 wr_mid;
+ int qidx = skb_get_queue_mapping(skb);
+ struct sge_eth_txq *q = &adap->sge.ethtxq[qidx + pi->first_qset];
+ unsigned int kctx_len = sa_entry->kctx_len;
+ int qid = q->q.cntxt_id;
+
+ atomic_inc(&adap->chcr_stats.ipsec_cnt);
+
+ flits = calc_tx_sec_flits(skb, kctx_len);
+
+ if (is_eth_imm(skb, kctx_len))
+ immdatalen = skb->len;
+
+ /* WR Header */
+ wr = (struct chcr_ipsec_wr *)pos;
+ wr->wreq.op_to_compl = htonl(FW_WR_OP_V(FW_ULPTX_WR));
+ wr_mid = FW_CRYPTO_LOOKASIDE_WR_LEN16_V(DIV_ROUND_UP(flits, 2));
+
+ if (unlikely(credits < ETHTXQ_STOP_THRES)) {
+ netif_tx_stop_queue(q->txq);
+ q->q.stops++;
+ wr_mid |= FW_WR_EQUEQ_F | FW_WR_EQUIQ_F;
+ }
+ wr->wreq.flowid_len16 = htonl(wr_mid);
+
+ /* ULPTX */
+ wr->req.ulptx.cmd_dest = FILL_ULPTX_CMD_DEST(pi->port_id, qid);
+ wr->req.ulptx.len = htonl(DIV_ROUND_UP(flits, 2) - 1);
+
+ /* Sub-command */
+ wr->req.sc_imm.cmd_more = FILL_CMD_MORE(immdatalen);
+ wr->req.sc_imm.len = cpu_to_be32(sizeof(struct cpl_tx_sec_pdu) +
+ sizeof(wr->req.key_ctx) +
+ kctx_len +
+ sizeof(struct cpl_tx_pkt_core) +
+ immdatalen);
+
+ /* CPL_SEC_PDU */
+ wr->req.sec_cpl.op_ivinsrtofst = htonl(
+ CPL_TX_SEC_PDU_OPCODE_V(CPL_TX_SEC_PDU) |
+ CPL_TX_SEC_PDU_CPLLEN_V(2) |
+ CPL_TX_SEC_PDU_PLACEHOLDER_V(1) |
+ CPL_TX_SEC_PDU_IVINSRTOFST_V(
+ (skb_transport_offset(skb) +
+ sizeof(struct ip_esp_hdr) + 1)));
+
+ wr->req.sec_cpl.pldlen = htonl(skb->len);
+
+ wr->req.sec_cpl.aadstart_cipherstop_hi = FILL_SEC_CPL_CIPHERSTOP_HI(
+ (skb_transport_offset(skb) + 1),
+ (skb_transport_offset(skb) +
+ sizeof(struct ip_esp_hdr)),
+ (skb_transport_offset(skb) +
+ sizeof(struct ip_esp_hdr) +
+ GCM_ESP_IV_SIZE + 1), 0);
+
+ wr->req.sec_cpl.cipherstop_lo_authinsert =
+ FILL_SEC_CPL_AUTHINSERT(0, skb_transport_offset(skb) +
+ sizeof(struct ip_esp_hdr) +
+ GCM_ESP_IV_SIZE + 1,
+ sa_entry->authsize,
+ sa_entry->authsize);
+ wr->req.sec_cpl.seqno_numivs =
+ FILL_SEC_CPL_SCMD0_SEQNO(CHCR_ENCRYPT_OP, 1,
+ CHCR_SCMD_CIPHER_MODE_AES_GCM,
+ CHCR_SCMD_AUTH_MODE_GHASH,
+ sa_entry->hmac_ctrl,
+ ivsize >> 1);
+ wr->req.sec_cpl.ivgen_hdrlen = FILL_SEC_CPL_IVGEN_HDRLEN(0, 0, 1,
+ 0, 0, 0);
+
+ pos += sizeof(struct fw_ulptx_wr) +
+ sizeof(struct ulp_txpkt) +
+ sizeof(struct ulptx_idata) +
+ sizeof(struct cpl_tx_sec_pdu);
+
+ pos = copy_key_cpltx_pktxt(skb, dev, pos, sa_entry);
+
+ return pos;
+}
+
+/**
+ * flits_to_desc - returns the num of Tx descriptors for the given flits
+ * @n: the number of flits
+ *
+ * Returns the number of Tx descriptors needed for the supplied number
+ * of flits.
+ */
+static inline unsigned int flits_to_desc(unsigned int n)
+{
+ WARN_ON(n > SGE_MAX_WR_LEN / 8);
+ return DIV_ROUND_UP(n, 8);
+}
+
+static inline unsigned int txq_avail(const struct sge_txq *q)
+{
+ return q->size - 1 - q->in_use;
+}
+
+static void eth_txq_stop(struct sge_eth_txq *q)
+{
+ netif_tx_stop_queue(q->txq);
+ q->q.stops++;
+}
+
+static inline void txq_advance(struct sge_txq *q, unsigned int n)
+{
+ q->in_use += n;
+ q->pidx += n;
+ if (q->pidx >= q->size)
+ q->pidx -= q->size;
+}
+
+/*
+ * chcr_ipsec_xmit called from ULD Tx handler
+ */
+int chcr_ipsec_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct xfrm_state *x = xfrm_input_state(skb);
+ struct ipsec_sa_entry *sa_entry;
+ u64 *pos, *end, *before, cntrl, *sgl;
+ int qidx, left, credits;
+ unsigned int flits = 0, ndesc, kctx_len;
+ struct adapter *adap;
+ struct sge_eth_txq *q;
+ struct port_info *pi;
+ dma_addr_t addr[MAX_SKB_FRAGS + 1];
+ bool immediate = false;
+
+ if (!x->xso.offload_handle)
+ return NETDEV_TX_BUSY;
+
+ sa_entry = (struct ipsec_sa_entry *)x->xso.offload_handle;
+ kctx_len = sa_entry->kctx_len;
+
+ if (skb->sp->len != 1) {
+out_free: dev_kfree_skb_any(skb);
+ return NETDEV_TX_OK;
+ }
+
+ pi = netdev_priv(dev);
+ adap = pi->adapter;
+ qidx = skb->queue_mapping;
+ q = &adap->sge.ethtxq[qidx + pi->first_qset];
+
+ cxgb4_reclaim_completed_tx(adap, &q->q, true);
+ cntrl = TXPKT_L4CSUM_DIS_F | TXPKT_IPCSUM_DIS_F;
+
+ flits = calc_tx_sec_flits(skb, sa_entry->kctx_len);
+ ndesc = flits_to_desc(flits);
+ credits = txq_avail(&q->q) - ndesc;
+
+ if (unlikely(credits < 0)) {
+ eth_txq_stop(q);
+ dev_err(adap->pdev_dev,
+ "%s: Tx ring %u full while queue awake! cred:%d %d %d flits:%d\n",
+ dev->name, qidx, credits, ndesc, txq_avail(&q->q),
+ flits);
+ return NETDEV_TX_BUSY;
+ }
+
+ if (is_eth_imm(skb, kctx_len))
+ immediate = true;
+
+ if (!immediate &&
+ unlikely(cxgb4_map_skb(adap->pdev_dev, skb, addr) < 0)) {
+ q->mapping_err++;
+ goto out_free;
+ }
+
+ pos = (u64 *)&q->q.desc[q->q.pidx];
+ before = (u64 *)pos;
+ end = (u64 *)pos + flits;
+ /* Setup IPSec CPL */
+ pos = (void *)chcr_crypto_wreq(skb, dev, (void *)pos,
+ credits, sa_entry);
+ if (before > (u64 *)pos) {
+ left = (u8 *)end - (u8 *)q->q.stat;
+ end = (void *)q->q.desc + left;
+ }
+ if (pos == (u64 *)q->q.stat) {
+ left = (u8 *)end - (u8 *)q->q.stat;
+ end = (void *)q->q.desc + left;
+ pos = (void *)q->q.desc;
+ }
+
+ sgl = (void *)pos;
+ if (immediate) {
+ cxgb4_inline_tx_skb(skb, &q->q, sgl);
+ dev_consume_skb_any(skb);
+ } else {
+ int last_desc;
+
+ cxgb4_write_sgl(skb, &q->q, (void *)sgl, end,
+ 0, addr);
+ skb_orphan(skb);
+
+ last_desc = q->q.pidx + ndesc - 1;
+ if (last_desc >= q->q.size)
+ last_desc -= q->q.size;
+ q->q.sdesc[last_desc].skb = skb;
+ q->q.sdesc[last_desc].sgl = (struct ulptx_sgl *)sgl;
+ }
+ txq_advance(&q->q, ndesc);
+
+ cxgb4_ring_tx_db(adap, &q->q, ndesc);
+ return NETDEV_TX_OK;
+}